Sierra Forest Xeons - E Cores Only

By: Brendan (btrotter.delete@this.gmail.com), May 21, 2022 10:36 am
Room: Moderated Discussions
Hi,

Linus Torvalds (torvalds.delete@this.linux-foundation.org) on May 21, 2022 12:06 am wrote:
> Brendan (btrotter.delete@this.gmail.com) on May 20, 2022 8:42 pm wrote:
> >
> > Just because a thread got migrated to a P core doesn't mean it has to stay there - you could migrate
> > a thread back to the E core for a while (until it uses the library again) if you want.
>
> That's the "hey, this can be fixed" thing.
>
> But the unfixable thing is much more fundamental: 'cpuid' is suddenly not reliable or meaningful.
>
> Basically, what does 'cpuid' mean?

If you dig into CPU errata (the risk of CPUID misreporting), and the differences between different vendors, and the differences between the same vendor over time (e.g. about 5 different methods to obtain something as simple as L2 data cache size going back all the way to "use vendor/family/stepping and lookup tables"); it's easy to argue that CPUID has been broken for 20+ years; and this is made worse by more CPU errata (e.g. "TSX doesn't work properly, but it's reported as supported").

Ideally a good OS would examine CPUID and auto-correct everything (and auto-enable work-arounds for things like "accessed/dirty flags don't work", etc), and put all the info into a sane "same for all CPUs regardless of vendor" format; and then everything in user-space would be dissuaded/banned from using raw CPUID (and only allowed to use the sanitized/corrected/standardized info from the kernel).

In this case; if a thread is restricted to one CPU type it can obtain information for that CPU type; and if a thread is able to be migrated between 2 or more CPU types the kernel can provide information that is compatible with 2 or more CPU types (e.g. AND feature flags, report cache characteristics as "minimum only" or both "minimum and maximum", etc).

Of course "similar but worse/less flexible" can be achieved if CPUID causes a trap (the current solution for hyper-visors that support migrating VMs to completely different computers).

> Does it mean "what are the capabilities of the CPU I happen to be running on right now"? But
> then it's useless in any system where the load can be migrated to another CPU at any time.
>
> Or does 'cpuid' mean "Ok, I now give you a set of capabilities that I guarantee"? So now any
> process that has ever run 'cpuid' will be tied to a code that matches what it was told?
>
> In other words, you are looking for an engineering solution to "oh, this core doesn't do instruction
> XYZ", but you are missing the much more fundamental issue. Intel by design has very much exposed
> that whole "query what the CPU supports" thing as a native instruction, and you cannot make
> that instruction work with sane semantics
in a heterogeneous system.
>
> And 'cpuid' is not some small implementation detail. It's literally what any core system
> library would use to decide "How do I choose implement functionality XYZ?". So 'cpuid' has
> to work, and it has or be reliable and meaningful, because it's literally how people will
> make the decision on whether to use the AVX512 version of the library or not.
>
> If you claim you do AVX512, then all processes end up getting pinned to
> big cores just because some random library goes "oh, then I'll use it".
>
> And if you claim not to do AVX512, then people won't be using
> it at all, and you would be better off not having it.,
>
> And if you randomly return a value based on "right now you happen to be running on CPU X, so you do or do not
> have AVX512 based on that", you end up with random performance and the worst of both of the above worlds.
>
> And that is all assuming that the system software bent over backwards to make the whole thing work
> with auto-migration in the first place, so all these bad outcomes actually require a fair amount of
> engineering to even work at all (ok, except for the "never report AVX512" case, of course).
>
> End result: you can't win.

How about we create an OS where unsupported instructions are emulated; so that you can run a new executable that uses AVX-512 on a crusty old Prescott Pentium 4 from 2005 without any problem (other than performance); and where a "some cores don't support AVX-512" problem becomes a performance issue (a minor addition to the "P cores are faster than E cores" performance issue you already have to deal with)?

> So you're answering the wrong question entirely. The question was never "Can I auto-migrate
> a process that uses AVX512 to a big core that supports it, and maybe auto-demote it later?"
>
> No. The question was much more fundamental: 'what does cpuid report?'.
>
> And that question simply has no valid useful answer in the heterogeneous system.
>
> Ergo: the heterogeneous model is broken. Fundamentally and unfixably so.

Nonsense. E.g. Intel could easily say "old CPUID leaves (with bit 15 of EAX clear) report information that's compatible with all cores; but (for CPUs that have mixed cores) here's a whole new set of CPUID leaves (with bit 15 of EAX set) that report information that only applies to this specific CPU" so that old software that checks CPUID works and new software that supports different CPUs can work better.

- Brendan

> (And as always: in embedded systems you can do anything you want, since you control the horizontal
> and you control the vertical. And so you can just keep big and small cores separate and never
> migrate things at all, or only do it for loads that explicitly have asked for it)
>
> Linus

< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Apple's AVX512---2022/05/12 12:32 AM
  Apple's AVX512Rayla2022/05/12 08:23 AM
    Apple's AVX512---2022/05/12 10:49 AM
      Apple's AVX512---2022/05/12 10:59 AM
  Questions About Apple's AVX512Matt Lohmann2022/05/13 05:21 AM
    Questions About Apple's AVX512---2022/05/13 09:33 AM
      Questions About Apple's AVX512Doug S2022/05/13 10:22 AM
        Questions About Apple's AVX512---2022/05/13 02:05 PM
          Questions About Apple's AVX512Doug S2022/05/13 09:28 PM
            Questions About Apple's AVX512Anon12022/05/14 12:53 AM
            Questions About Apple's AVX512Simon Farnsworth2022/05/14 05:20 AM
              Questions About Apple's AVX512Michael S2022/05/14 12:27 PM
                Questions About Apple's AVX512Doug S2022/05/15 10:50 AM
                  Questions About Apple's AVX512Michael S2022/05/15 01:01 PM
                    Questions About Apple's AVX512Doug S2022/05/16 12:59 AM
                      Questions About Apple's AVX512Michael S2022/05/16 02:29 AM
                    what it takes to really vectorizeRichardC2022/05/16 02:47 PM
                  Questions About Apple's AVX512---2022/05/16 10:22 PM
                    Questions About Apple's AVX512rwessel2022/05/17 01:42 AM
                      Questions About Apple's AVX512anon12022/05/17 04:47 AM
                        Questions About Apple's AVX512Michael S2022/05/17 06:28 AM
                          Questions About Apple's AVX512anon12022/05/18 01:15 AM
                            Questions About Apple's AVX512-.-2022/05/18 03:41 AM
                              Questions About Apple's AVX512Jan Wassenberg2022/05/18 10:23 PM
                                Questions About Apple's AVX512-.-2022/05/19 06:11 AM
                                  Questions About Apple's AVX512Jan Wassenberg2022/05/19 06:45 AM
                                    Questions About Apple's AVX512-.-2022/05/20 04:04 AM
                                      Questions About Apple's AVX512Jan Wassenberg2022/05/20 10:00 PM
                Questions About Apple's AVX512anon12022/05/16 04:44 AM
              Questions About Apple's AVX512Jörn Engel2022/05/15 11:34 PM
                Questions About Apple's AVX512Simon Farnsworth2022/05/16 04:13 AM
                  Questions About Apple's AVX512Jörn Engel2022/05/16 12:52 PM
                    Backward Compatibility for SVE2 CodeCharlie Burnes2022/05/16 06:57 PM
                      Backward Compatibility for SVE2 CodeJörn Engel2022/05/17 12:30 AM
                        Backward Compatibility for SVE2 CodeCharlie Burnes2022/05/17 03:31 AM
                          Backward Compatibility for SVE2 CodeJörn Engel2022/05/17 10:24 AM
                            Backward Compatibility for SVE2 CodeCharlie Burnes2022/05/17 11:21 AM
                              Backward Compatibility for SVE2 CodeJörn Engel2022/05/17 02:11 PM
                                OpenMP SIMD DirectivesCharlie Burnes2022/05/17 04:05 PM
                                  OpenMP SIMD DirectivesJörn Engel2022/05/17 05:14 PM
                                    OpenMP SIMD DirectivesJan Wassenberg2022/05/20 10:12 PM
                                      OpenMP SIMD DirectivesFreddie2022/05/21 07:13 AM
                                        OpenMP SIMD DirectivesJan Wassenberg2022/05/21 10:54 PM
                                      OpenMP SIMD DirectivesJörn Engel2022/05/21 01:23 PM
                                        Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/21 10:11 PM
                                          Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/21 11:16 PM
                                            Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/22 06:30 AM
                                              Removal of NEONDoug S2022/05/22 10:57 AM
                                                Removal of NEONCharlie Burnes2022/05/22 01:12 PM
                                                Removal of NEON-.-2022/05/23 04:23 AM
                                                  Removal of NEONDoug S2022/05/23 08:08 AM
                                                    Removal of NEONdmcq2022/05/23 12:59 PM
                                                  Removal of NEONblaine2022/05/24 10:40 PM
                                              Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/22 12:06 PM
                                                Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/22 01:06 PM
                                                  Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/22 10:35 PM
                                              Alternative to Highway for code that is not SIMD width agnostic-.-2022/05/23 04:28 AM
                                          Alternative to Highway for code that is not SIMD width agnosticAdrian2022/05/22 05:04 AM
                                            Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/22 07:20 AM
                                          Alternative to Highway for code that is not SIMD width agnosticJörn Engel2022/05/22 01:13 PM
                                            Alternative to Highway for code that is not SIMD width agnosticCharlie Burnes2022/05/22 01:53 PM
                                              Alternative to Highway for code that is not SIMD width agnosticJörn Engel2022/05/22 02:49 PM
                                                Unaligned Loads and StoresCharlie Burnes2022/05/22 05:34 PM
                                                Alternative to Highway for code that is not SIMD width agnosticJan Wassenberg2022/05/22 10:46 PM
                                                  Unaligned Loads and StoresCharlie Burnes2022/05/23 12:46 AM
                                                    Unaligned Loads and StoresJan Wassenberg2022/05/23 05:34 AM
                                                  Is Highway a full compiler or yet another LLVM front-end, like icpc ? (NT)Michael S2022/05/23 01:12 AM
                                                    Is Highway a full compiler or yet another LLVM front-end, like icpc ?none2022/05/23 01:57 AM
                                                      Is Highway a full compiler or yet another LLVM front-end, like icpc ?Michael S2022/05/23 02:08 AM
                                                        Is Highway a full compiler or yet another LLVM front-end, like icpc ?Jan Wassenberg2022/05/23 05:38 AM
                                        OpenMP SIMD DirectivesJan Wassenberg2022/05/21 11:07 PM
                                          OpenMP SIMD DirectivesJörn Engel2022/05/22 01:25 PM
                                            OpenMP SIMD DirectivesJan Wassenberg2022/05/22 10:56 PM
                                              OpenMP SIMD DirectivesMichael S2022/05/23 02:32 AM
                                                OpenMP SIMD DirectivesJan Wassenberg2022/05/23 05:49 AM
                                                  OpenMP SIMD DirectivesMichael S2022/05/23 01:04 PM
                                                    OpenMP SIMD DirectivesJan Wassenberg2022/05/23 10:43 PM
                                        OpenMP SIMD Directivesanon22022/05/22 11:42 PM
                                          OpenMP SIMD DirectivesJörn Engel2022/05/23 12:11 AM
                                            OpenMP SIMD Directivesanon22022/05/23 12:47 AM
                                              TemplatesMichael S2022/05/23 02:52 AM
                                                Templatesanon22022/05/23 03:36 AM
                                                  At least use a handle unique in the thread you post in... (NT)anon22022/05/23 08:16 AM
                                              TemplatesJörn Engel2022/05/23 10:41 AM
                              Backward Compatibility for SVE2 Codeanonymou52022/05/17 02:36 PM
                                Lack of Backward Compatibility for Intel AVX512Charlie Burnes2022/05/17 03:22 PM
                                  Lack of Backward Compatibility for Intel AVX512anonymou52022/05/18 03:15 AM
                                    Lack of Backward Compatibility for Intel AVX512anon22022/05/18 03:36 AM
                                      Lack of Backward Compatibility for Intel AVX512anonymou52022/05/18 05:06 AM
                                        Lack of Backward Compatibility for Intel AVX512Michael S2022/05/18 05:36 AM
                                          Lack of Backward Compatibility for Intel AVX512me2022/05/18 05:50 AM
                                            Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/18 06:47 AM
                                              Lack of Backward Compatibility for Intel AVX512me2022/05/18 09:18 AM
                                              Lack of Backward Compatibility for Intel AVX512Doug S2022/05/18 10:26 AM
                                                Lack of Backward Compatibility for Intel AVX512Brett2022/05/18 11:03 AM
                                                  Lack of Backward Compatibility for Intel AVX512me2022/05/18 11:35 AM
                                                    Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/18 10:31 PM
                                                      Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/19 05:58 AM
                                                        Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/19 06:55 AM
                                                          Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/19 11:09 AM
                                                            Why Is AVX 512 Useful for RPCS3?-.-2022/06/15 07:04 PM
                                                              Why Is AVX 512 Useful for RPCS3?Jukka Larja2022/06/15 09:33 PM
                                                    Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/19 05:56 AM
                                                      Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/19 06:49 AM
                                                        Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/19 11:14 AM
                                                          Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/19 12:19 PM
                                                            Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/20 10:04 AM
                                                              Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/20 01:48 PM
                                                                Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/20 09:48 PM
                                                                  Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/21 07:44 PM
                                                                    Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/21 09:48 PM
                                                                      Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/22 02:46 AM
                                                                        Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/22 05:32 AM
                                                                          Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/22 04:06 PM
                                                                            Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/23 12:59 AM
                                                                              Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/23 11:02 PM
                                                                                Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/24 02:33 AM
                                                                                  Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/24 03:18 PM
                                                                                    Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/25 06:01 AM
                                                                                      Lack of Backward Compatibility for Intel AVX512zzyzx2022/05/25 03:02 PM
                                                      Lack of Backward Compatibility for Intel AVX512Eugene Nalimov2022/05/19 10:25 PM
                                                        Lack of Backward Compatibility for Intel AVX512Jukka Larja2022/05/20 09:34 AM
                                                  Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/18 10:40 PM
                                                    Lack of Backward Compatibility for Intel AVX512Andrey2022/05/19 09:26 AM
                                                    Lack of Backward Compatibility for Intel AVX512Brett2022/05/19 11:23 AM
                                                      Lack of Backward Compatibility for Intel AVX512Andrey2022/05/19 01:50 PM
                                                        Lack of Backward Compatibility for Intel AVX512Brett2022/05/20 11:52 PM
                                                  Lack of Backward Compatibility for Intel AVX512Adrian2022/05/19 12:22 AM
                                                  Lack of Backward Compatibility for Intel AVX512Brendan2022/05/19 04:32 AM
                                                Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/18 10:29 PM
                                                  Lack of Backward Compatibility for Intel AVX512Michael S2022/05/19 01:14 AM
                                                    Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/19 07:02 AM
                                                      Lack of Backward Compatibility for Intel AVX512Michael S2022/05/19 08:13 AM
                                                        Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/20 01:34 AM
                                                          Lack of Backward Compatibility for Intel AVX512Michael S2022/05/20 02:48 AM
                                                          OT Documentation on JPEG XL - site certificate brokenMichael S2022/05/20 03:17 AM
                                                            OT Documentation on JPEG XL - site certificate brokenJan Wassenberg2022/05/20 10:18 PM
                                                    Lack of Backward Compatibility for Intel AVX512-.-2022/05/20 03:55 AM
                                                      Lack of Backward Compatibility for Intel AVX512Michael S2022/05/20 05:51 AM
                                                        Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/20 10:54 PM
                                                          Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/20 10:57 PM
                                                            Lack of Backward Compatibility for Intel AVX512Michael S2022/05/21 10:57 AM
                                                              Lack of Backward Compatibility for Intel AVX512---2022/05/21 06:59 PM
                                                                Adding instructions to NEON??Doug S2022/05/22 11:01 AM
                                                                  Adding instructions to NEON??---2022/05/22 01:59 PM
                                                                    Adding instructions to NEON??Doug S2022/05/22 08:46 PM
                                                                      Adding instructions to NEON??Michael S2022/05/23 01:04 AM
                                                                        Adding instructions to NEON??anonymou52022/05/24 04:02 PM
                                                                      Adding instructions to NEON??Ungo2022/05/23 02:05 AM
                                                                        Adding instructions to NEON??---2022/05/23 06:49 AM
                                                                          Adding instructions to NEON??Ungo2022/05/23 09:01 PM
                                                                            Adding instructions to NEON??---2022/05/24 10:26 AM
                                                                      Adding instructions to NEON??---2022/05/23 06:56 AM
                                                                Lack of Backward Compatibility for Intel AVX512noko2022/05/23 12:29 PM
                                                              Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/21 11:47 PM
                                                                Lack of Backward Compatibility for Intel AVX512Michael S2022/05/22 01:40 AM
                                                                  Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/22 04:06 AM
                                                                    Lack of Backward Compatibility for Intel AVX512Michael S2022/05/22 05:12 AM
                                                                      Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/22 05:53 AM
                                                                        Lack of Backward Compatibility for Intel AVX512Michael S2022/05/22 06:15 AM
                                                                          Lack of Backward Compatibility for Intel AVX512Jan Wassenberg2022/05/22 11:56 AM
                                              Lack of Backward Compatibility for Intel AVX512-.-2022/05/18 05:23 PM
                                                Sierra Forest Xeons - E Cores OnlyCharlie Burnes2022/05/19 03:11 AM
                                                  Sierra Forest Xeons - E Cores OnlyBrendan2022/05/19 04:42 AM
                                                    Sierra Forest Xeons - E Cores OnlyCharlie Burnes2022/05/19 05:30 AM
                                                      Sierra Forest Xeons - E Cores OnlyBrendan2022/05/20 04:06 AM
                                                        Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/20 11:32 AM
                                                          Sierra Forest Xeons - E Cores OnlyMark2022/05/20 12:15 PM
                                                            Sierra Forest Xeons - E Cores OnlyAndrey2022/05/20 03:34 PM
                                                            Sierra Forest Xeons - E Cores OnlyBrendan2022/05/20 05:29 PM
                                                            Sierra Forest Xeons - E Cores OnlyBjörn Ragnar Björnsson2022/05/20 05:54 PM
                                                              Sierra Forest Xeons - E Cores OnlyBrendan2022/05/20 08:42 PM
                                                                Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/21 12:06 AM
                                                                  Sierra Forest Xeons - E Cores Onlyanon22022/05/21 01:45 AM
                                                                    Sierra Forest Xeons - E Cores OnlyDoug S2022/05/21 12:33 PM
                                                                      Sierra Forest Xeons - E Cores OnlyBrett2022/05/21 05:18 PM
                                                                      Sierra Forest Xeons - E Cores Onlyanon22022/05/22 01:32 AM
                                                                  Sierra Forest Xeons - E Cores Onlyrwessel2022/05/21 05:05 AM
                                                                  Sierra Forest Xeons - E Cores OnlyBrendan2022/05/21 10:36 AM
                                                                    Sierra Forest Xeons - E Cores OnlyAndrey2022/05/21 11:30 AM
                                                                      Sierra Forest Xeons - E Cores OnlyBrendan2022/05/21 12:58 PM
                                                                        Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/21 04:58 PM
                                                                          Sierra Forest Xeons - E Cores Only-.-2022/05/21 07:03 PM
                                                                          Sierra Forest Xeons - E Cores OnlyBrendan2022/05/22 11:18 AM
                                                                            Sierra Forest Xeons - E Cores OnlyAndrey2022/05/22 04:18 PM
                                                                              Sierra Forest Xeons - E Cores OnlyBrendan2022/05/22 08:41 PM
                                                                                Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/22 09:49 PM
                                                                                  Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/22 11:11 PM
                                                                                    Proposal for heterogeneous runtime dispatchJörn Engel2022/05/22 11:51 PM
                                                                                      Proposal for heterogeneous runtime dispatchAdrian2022/05/23 12:25 AM
                                                                                        CorrectionAdrian2022/05/23 12:34 AM
                                                                                      Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/23 12:41 AM
                                                                                    Proposal for heterogeneous runtime dispatchUngo2022/05/23 01:27 AM
                                                                                      Proposal for heterogeneous runtime dispatchMichael S2022/05/23 03:14 AM
                                                                                      Heterogeneous ISA?Jan Wassenberg2022/05/23 06:11 AM
                                                                                        RISC-VPeter Lewis2022/05/30 03:45 PM
                                                                                          RISC-VHeikki Kultala2022/05/31 08:59 AM
                                                                                            RISC-VPeter Lewis2022/05/31 04:34 PM
                                                                                              RISC-VDoug S2022/06/01 12:45 AM
                                                                                                RISC-VPeter Lewis2022/06/01 03:55 PM
                                                                                                  RISC-VDoug S2022/06/01 09:50 PM
                                                                                                    RISC-V Eric Fink2022/06/02 12:20 AM
                                                                                                      Process...Anon2022/06/02 12:35 AM
                                                                                                        Process...Peter Lewis2022/06/02 01:54 AM
                                                                                                        Process...Michael S2022/06/02 04:42 AM
                                                                                                        Process...Eric Fink2022/06/02 05:43 AM
                                                                                                          Process...---2022/06/02 01:06 PM
                                                                                                            Process...Peter Lewis2022/06/02 02:01 PM
                                                                                                              Process... ItaniumRichard S2022/06/02 05:14 PM
                                                                                                                ItaniumPeter Lewis2022/06/02 06:07 PM
                                                                                                                  ItaniumRichard S2022/06/02 09:27 PM
                                                                                                                Process... ItaniumMichael S2022/06/03 04:39 AM
                                                                                                                  Process... ItaniumAdrian2022/06/03 05:26 AM
                                                                                                                    Process... ItaniumMichael S2022/06/03 06:32 AM
                                                                                                                      Process... ItaniumAdrian2022/06/03 07:14 AM
                                                                                                              Process...Doug S2022/06/02 10:54 PM
                                                                                                                Process...Peter Lewis2022/06/03 01:19 AM
                                                                                                            Process...Mark Roulo2022/06/02 08:15 PM
                                                                                                              Process...Michael S2022/06/03 05:06 AM
                                                                                                            Process...Brendan2022/06/02 09:13 PM
                                                                                                          Process...anon22022/06/02 04:13 PM
                                                                                                            Process...Eric Fink2022/06/02 10:00 PM
                                                                                                              Process...Michael S2022/06/03 05:16 AM
                                                                                                                Process...Doug S2022/06/03 08:57 AM
                                                                                                                  Process...James2022/06/04 04:46 AM
                                                                                                                    Process...Doug S2022/06/04 09:04 AM
                                                                                                                      Process...Anon42022/06/04 10:31 AM
                                                                                                                      Process...James2022/06/04 10:49 AM
                                                                                                          Process...Anon2022/06/05 02:55 AM
                                                                                                        There is no 5nm or 7nm anywhere.Heikki Kultala2022/06/02 10:45 AM
                                                                                                          There is no 5nm or 7nm anywhere.Doug S2022/06/02 11:10 AM
                                                                                                            There is no 5nm or 7nm anywhere.Heikki Kultala2022/06/02 11:50 AM
                                                                                                            There is no 5nm or 7nm anywhere.Peter Lewis2022/06/02 12:07 PM
                                                                                                            There is no 5nm or 7nm anywhere.anon22022/06/02 04:30 PM
                                                                                                          There is no 5nm or 7nm anywhere.Anon2022/06/05 01:41 AM
                                                                                                    RISC-VPeter Lewis2022/06/02 01:22 AM
                                                                                                      RISC-VFreddie2022/06/02 07:22 AM
                                                                                                        RISC-V---2022/06/02 01:25 PM
                                                                                                    RISC-VAdrian2022/06/02 01:47 AM
                                                                                                      RISC-VDoug S2022/06/02 11:18 AM
                                                                                                      x86 vs RISCHeikki Kultala2022/06/02 12:04 PM
                                                                                                        x86 vs RISCAnon2022/06/02 02:49 PM
                                                                                                          x86 vs RISCTim Mc2022/06/02 04:20 PM
                                                                                                          x86 vs RISCDoug S2022/06/02 11:01 PM
                                                                                                            x86 vs RISCAnon2022/06/05 01:55 AM
                                                                                                              x86 vs RISCPeter Lewis2022/06/05 04:23 PM
                                                                                                                x86 vs RISCAnon2022/06/05 04:32 PM
                                                                                                                Register Windows.Mark Roulo2022/06/06 09:56 AM
                                                                                                                  Register Windows.blaine2022/06/06 01:51 PM
                                                                                                                    S/W managed TLB missesMark Roulo2022/06/06 02:18 PM
                                                                                                                      S/W managed TLB missesMichael S2022/06/06 02:31 PM
                                                                                                                      S/W managed TLB missesblaine2022/06/06 11:53 PM
                                                                                                                      S/W managed TLB missesvonk2022/06/07 01:04 AM
                                                                                                                      S/W managed TLB missesDoug S2022/06/07 08:50 AM
                                                                                                                        S/W managed TLB missesanon22022/06/07 10:21 PM
                                                                                                                          S/W managed TLB missesJames2022/06/08 02:07 AM
                                                                                                                            S/W managed TLB missesMichael S2022/06/08 02:20 AM
                                                                                                                            S/W managed TLB missesanon22022/06/08 02:53 AM
                                                                                                                          Fairchild Clipper had h/w table walkPaul A. Clayton2022/06/09 12:46 PM
                                                                                                                            Fairchild Clipper had h/w table walkSimon Farnsworth2022/06/10 01:58 AM
                                                                                                                    Register Windows.anon22022/06/06 03:21 PM
                                                                                                        x86 vs RISCEric Fink2022/06/02 10:11 PM
                                                                                                          x86 vs RISCMichael S2022/06/03 06:49 AM
                                                                                                            x86 vs RISCBrett2022/06/03 12:32 PM
                                                                                                            x86 vs RISCAnon2022/06/05 02:23 AM
                                                                                                        x86 vs RISCAdrian2022/06/02 11:47 PM
                                                                                                      RISC-VAnon2022/06/02 02:33 PM
                                                                                                  RISC-V lifespan; encodings2022/06/04 11:39 AM
                                                                                                    µop CachePeter Lewis2022/06/04 06:56 PM
                                                                                                      x86 decode cores2022/06/05 12:32 AM
                                                                                                        x86 decode coresPeter Lewis2022/06/05 01:26 AM
                                                                                                        x86 decode coresPeter Lewis2022/06/06 04:22 AM
                                                                                                      µop CacheDoug S2022/06/05 11:08 AM
                                                                                                    RISC-V lifespan; encodingsEric Fink2022/06/05 04:26 AM
                                                                                                      RISC-V lifespan; encodings2022/06/05 07:37 AM
                                                                                                        RISC-V lifespan; encodingsanonymou52022/06/05 12:32 PM
                                                                                                          RISC-V lifespan; encodingsAnon2022/06/05 03:09 PM
                                                                                                          RISC-V lifespan; encodings2022/06/06 07:52 AM
                                                                                                            RISC-V lifespan; encodingsanonymou52022/06/06 08:07 AM
                                                                                                              RISC-V lifespan; encodingsAdrian2022/06/06 10:59 AM
                                                                                                                RISC-V lifespan; encodingsAnon2022/06/06 12:38 PM
                                                                                                                  RISC-V lifespan; encodingsAdrian2022/06/07 01:21 AM
                                                                                                                    RISC-V lifespan; encodingsMichael S2022/06/07 02:23 AM
                                                                                                                      RISC-V lifespan; encodingsAdrian2022/06/07 05:20 AM
                                                                                                                        RISC-V lifespan; encodingsBrett2022/06/07 06:04 PM
                                                                                                                          RISC-V lifespan; encodingsAnon2022/06/07 09:58 PM
                                                                                                                            RISC-V lifespan; encodings2022/06/08 08:07 AM
                                                                                                                              RISC-V lifespan; encodingsAnon2022/06/08 10:25 AM
                                                                                                                                RISC-V lifespan; encodings2022/06/08 12:07 PM
                                                                                                                RISC-V lifespan; encodingsBrett2022/06/06 01:50 PM
                                                                                                                  RISC-V lifespan; encodingsAdrian2022/06/07 12:59 AM
                                                                                                              RISC-V lifespan; encodingsAdrian2022/06/06 10:59 AM
                                                                                                              RISC-V lifespan; encodings2022/06/06 11:08 AM
                                                                                                    RISC-V lifespan; encodings---2022/06/05 06:12 PM
                                                                                                      RISC-V lifespan; encodingsAnon2022/06/05 06:48 PM
                                                                                                      RISC-V lifespan; encodingsJukka Larja2022/06/05 10:18 PM
                                                                                                        Profile-Guided OptimizationPeter Lewis2022/06/06 03:55 AM
                                                                                                          Profile-Guided Optimizationrwessel2022/06/06 05:26 AM
                                                                                                            Profile-Guided OptimizationDoug S2022/06/06 10:44 AM
                                                                                                              Profile-Guided OptimizationAndrew Clough2022/06/06 11:08 AM
                                                                                                              Profile-Guided Optimizationrwessel2022/06/06 11:57 AM
                                                                                                                Example of JIT cacheMark Roulo2022/06/06 02:10 PM
                                                                                                                  Example of JIT cacherwessel2022/06/06 02:59 PM
                                                                                                                    Example of JIT cacheMark Roulo2022/06/07 06:40 AM
                                                                                                                      Example of JIT cacherwessel2022/06/07 07:46 AM
                                                                                                              Profile-Guided OptimizationSimon Farnsworth2022/06/07 02:47 AM
                                                                                                          Profile-Guided OptimizationJukka Larja2022/06/06 08:42 PM
                                                                                                      Accurate branch prediction is not everythingPaul A. Clayton2022/06/14 11:48 AM
                                                                                                        Accurate branch prediction is not everything---2022/06/14 01:40 PM
                                                                                                          Accurate branch prediction is not everythingJames2022/06/14 03:41 PM
                                                                                                        Accurate branch prediction is not everythingdmcq2022/06/15 09:38 AM
                                                                                                          Accurate branch prediction is not everythingnone2022/06/15 09:57 AM
                                                                                                            Accurate branch prediction is not everythingdmcq2022/06/15 10:23 AM
                                                                                                            Accurate branch prediction is not everythingDoug S2022/06/15 01:55 PM
                                                                                                              Accurate branch prediction is not everythingdmcq2022/06/15 04:38 PM
                                                                                                Adding Neural Engines to x86Peter Lewis2022/06/04 07:06 PM
                                                                                                  Adding Neural Engines to x86Freddie2022/06/05 12:07 PM
                                                                                                    Adding Neural Engines to x86Peter Lewis2022/06/05 04:20 PM
                                                                                                      Adding Neural Engines to x86---2022/06/05 06:40 PM
                                                                                                        Adding Neural Engines to x86Peter Lewis2022/06/05 09:22 PM
                                                                                                  Adding Neural Engines to x86---2022/06/05 06:34 PM
                                                                                                    Missing metricsAnon2022/06/05 06:59 PM
                                                                                                    Adding Neural Engines to x86Peter Lewis2022/06/06 03:41 AM
                                                                                            RISC-VJan Wassenberg2022/05/31 10:00 PM
                                                                                              RISC-VPeter Lewis2022/06/01 04:02 PM
                                                                                                RISC-VJan Wassenberg2022/06/01 10:17 PM
                                                                                              RISC-V Eric Fink2022/06/02 12:25 AM
                                                                                                RISC-VJan Wassenberg2022/06/02 11:10 PM
                                                                                                  RISC-VEric Fink2022/06/03 12:23 AM
                                                                                                    RISC-VJan Wassenberg2022/06/03 11:10 PM
                                                                                                      RISC-VJukka Larja2022/06/04 12:15 AM
                                                                                                        RISC-VJan Wassenberg2022/06/04 11:23 PM
                                                                                                      RISC-VEric Fink2022/06/04 05:59 AM
                                                                                                        RISC-VJan Wassenberg2022/06/04 11:14 PM
                                                                                                    RISC-VLinus Torvalds2022/06/04 10:17 AM
                                                                                                      RISC-V-.-2022/06/04 05:56 PM
                                                                                                        RISC-VLinus Torvalds2022/06/04 08:00 PM
This Post has been deleted
                                                                                                      RISC-VEric Fink2022/06/05 04:31 AM
                                                                                                        SIMD in parsingWilco2022/06/05 05:40 AM
                                                                                                          SIMD in parsingFoo_2022/06/06 02:19 AM
                                                                                                            SIMD in parsingMichael S2022/06/06 02:43 AM
                                                                                                              SIMD in parsingLinus Torvalds2022/06/06 09:40 AM
                                                                                                          SIMD in parsing-.-2022/06/08 05:28 AM
                                                                                              RISC-V V-extensionHeikki Kultala2022/06/02 10:40 AM
                                                                                                RISC-V V-extensionJan Wassenberg2022/06/02 11:09 PM
                                                                                            RISC-VPer Hesselgren2022/06/01 05:40 AM
                                                                                    Proposal for heterogeneous runtime dispatchBrendan2022/05/23 01:51 AM
                                                                                    Proposal for heterogeneous runtime dispatchBrendan2022/05/23 01:51 AM
                                                                                      Proposal for heterogeneous runtime dispatchBjörn Ragnar Björnsson2022/05/23 05:41 PM
                                                                                        Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/23 10:38 PM
                                                                                          Proposal for heterogeneous runtime dispatchJukka Larja2022/05/24 02:48 AM
                                                                                            Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/24 04:35 AM
                                                                                              Proposal for heterogeneous runtime dispatchJukka Larja2022/05/24 07:38 AM
                                                                                                Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/29 12:51 AM
                                                                                          Proposal for heterogeneous runtime dispatchMichael S2022/05/24 03:48 AM
                                                                                            SIMD applicabilityJan Wassenberg2022/05/24 04:50 AM
                                                                                              Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityMark Roulo2022/05/24 07:41 AM
                                                                                                Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityJan Wassenberg2022/05/24 11:23 AM
                                                                                                  Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneitySimon Farnsworth2022/05/24 01:56 PM
                                                                                                Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityBrendan2022/05/24 05:09 PM
                                                                                                  Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityDoug S2022/05/24 10:03 PM
                                                                                                    Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityBrendan2022/05/25 05:37 PM
                                                                                                  Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityJukka Larja2022/05/25 06:24 AM
                                                                                                    Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityBrendan2022/05/25 06:16 PM
                                                                                                      Don't mix up SIMD support with AVX2 vs AVX-512 heterogeneityJukka Larja2022/05/25 08:50 PM
                                                                                            Proposal for heterogeneous runtime dispatchAdrian2022/05/24 02:39 PM
                                                                                              Proposal for heterogeneous runtime dispatchJörn Engel2022/05/24 09:41 PM
                                                                                              Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/29 12:51 AM
                                                                                                Proposal for heterogeneous runtime dispatchAdrian2022/05/29 04:33 AM
                                                                                                  Proposal for heterogeneous runtime dispatchAdrian2022/05/29 04:48 AM
                                                                                                  Proposal for heterogeneous runtime dispatchJan Wassenberg2022/05/29 11:05 AM
                                                                                                    Proposal for heterogeneous runtime dispatchAdrian2022/05/29 01:39 PM
                                                                                                      turbostat instructionsJan Wassenberg2022/05/29 10:51 PM
                                                                                                  Proposal for heterogeneous runtime dispatchSome dude2022/05/30 12:04 PM
                                                                                          Proposal for heterogeneous runtime dispatchSimon Farnsworth2022/05/24 04:21 AM
                                                                                  Sierra Forest Xeons - E Cores OnlyBrendan2022/05/23 12:41 AM
                                                                                    Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/23 03:03 AM
                                                                                      Sierra Forest Xeons - E Cores OnlyBrendan2022/05/23 09:12 AM
                                                                                        Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/24 04:18 AM
                                                                                          Sierra Forest Xeons - E Cores Onlyrwessel2022/05/24 08:22 AM
                                                                                    Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/23 12:30 PM
                                                                                      Sierra Forest Xeons - E Cores OnlyBrendan2022/05/23 01:13 PM
                                                                                        Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/23 04:54 PM
                                                                                          Sierra Forest Xeons - E Cores Only2022/05/24 11:49 AM
                                                                                            Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/24 12:11 PM
                                                                                              Sierra Forest Xeons - E Cores Only2022/05/24 03:12 PM
                                                                                                Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/24 04:33 PM
                                                                                          Sierra Forest Xeons - E Cores OnlyBrendan2022/05/24 01:44 PM
                                                                                            Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/24 02:14 PM
                                                                                              Sierra Forest Xeons - E Cores Only2022/05/24 03:37 PM
                                                                                                Sierra Forest Xeons - E Cores OnlyJames2022/05/26 03:42 AM
                                                                                              Sierra Forest Xeons - E Cores OnlyBrendan2022/05/24 09:53 PM
                                                                                              Sierra Forest Xeons - E Cores OnlyJörn Engel2022/05/25 12:09 AM
                                                                                                Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/25 02:27 AM
                                                                                                  Sierra Forest Xeons - E Cores OnlyJan Wassenberg2022/05/29 12:49 AM
                                                                                                    Sierra Forest Xeons - E Cores OnlyMichael S2022/05/29 02:15 AM
                                                                                                      Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/29 10:48 AM
                                                                                                        Sierra Forest Xeons - E Cores Onlyanonymou52022/05/29 11:35 AM
                                                                                                          Sierra Forest Xeons - E Cores OnlyLinus Torvalds2022/05/30 11:07 AM
                                                                                                            Sierra Forest Xeons - E Cores Onlyanonymou52022/05/30 12:46 PM
                                                                                                        Sierra Forest Xeons - E Cores OnlyMichael S2022/05/29 11:59 AM
                                                                                                      Sierra Forest Xeons - E Cores OnlyJan Wassenberg2022/05/29 11:20 AM
                                                                                                        Sierra Forest Xeons - E Cores OnlyMichael S2022/05/29 01:38 PM
                                                                                                          Sierra Forest Xeons - E Cores OnlyJörn Engel2022/05/29 02:10 PM
                                                                                                          Sierra Forest Xeons - E Cores Only-.-2022/05/29 05:28 PM
                                                                                                            Sierra Forest Xeons - E Cores OnlyMichael S2022/05/30 01:32 AM
                                                                                                              Sierra Forest Xeons - E Cores Only-.-2022/05/30 02:44 AM
                                                                                                                Sierra Forest Xeons - E Cores OnlyMichael S2022/05/30 03:12 AM
                                                                                                                  Sierra Forest Xeons - E Cores Only-.-2022/05/30 05:46 AM
                                                                                                          Sierra Forest Xeons - E Cores OnlyJan Wassenberg2022/05/29 10:48 PM
                                                                                                            quick radix mergeMichael S2022/05/30 01:02 AM
                                                                                                              quick radix mergeJan Wassenberg2022/05/30 07:16 AM
                                                                                                                quick radix mergeMichael S2022/05/30 08:36 AM
                                                                                                                  quick radix mergeJan Wassenberg2022/05/30 10:07 PM
                                                                                                                quick radix mergerwessel2022/05/30 09:36 AM
                                                                                      Sierra Forest Xeons - E Cores OnlyChristian Bornträger2022/05/24 08:06 AM
                                                                                        Sierra Forest Xeons - E Cores Onlyrwessel2022/05/24 08:40 AM
                                                                          Sierra Forest Xeons - E Cores Only2022/05/22 11:51 AM
                                                                            Sierra Forest Xeons - E Cores OnlyDoug S2022/05/22 08:52 PM
                                                                              Linux doesn't have a plan for hetero-ISA CPUs2022/05/23 06:03 AM
                                                                                Linux doesn't have a plan for hetero-ISA CPUsDoug S2022/05/23 08:35 AM
                                                                                  Linux doesn't have a plan for hetero-ISA CPUsBrendan2022/05/23 11:44 AM
                                                                                    Linux doesn't have a plan for hetero-ISA CPUsGionatan Danti2022/05/24 06:29 AM
                                                                            Sierra Forest Xeons - E Cores OnlySimon Farnsworth2022/05/23 04:16 AM
                                                                    Sierra Forest Xeons - E Cores OnlyJukka Larja2022/05/21 10:23 PM
                                                          well said (NT)Michael S2022/05/21 11:48 AM
                                                  Sierra Forest Xeons - E Cores OnlyMichael S2022/05/19 05:00 AM
                                                  Sierra Forest Xeons - E Cores Only-.-2022/05/19 06:25 AM
                                                    Sierra Forest Xeons - E Cores OnlyMichael S2022/05/20 06:29 AM
                                                  Sierra Forest Xeons - E Cores Onlyanonymou52022/05/19 09:46 AM
                                                    Sierra Forest Xeons - E Cores OnlyCharlie Burnes2022/05/19 02:19 PM
                                                      Sierra Forest Xeons - E Cores OnlyAdrian2022/05/20 12:29 AM
                                              Lack of Backward Compatibility for Intel AVX512Adrian2022/05/18 11:57 PM
                                                Lack of Backward Compatibility for Intel AVX512Brett2022/05/19 10:55 AM
                                                  Lack of Backward Compatibility for Intel AVX512Michael S2022/05/19 11:53 AM
                                                  Lack of Backward Compatibility for Intel AVX512Adrian2022/05/20 12:38 AM
                              Backward Compatibility for SVE2 Code---2022/05/17 02:57 PM
                                Backward Compatibility for SVE2 CodeCharlie Burnes2022/05/17 04:12 PM
                                Backward Compatibility for SVE2 Codeanon12022/05/18 02:44 AM
                                  Backward Compatibility for SVE2 CodeSimon Farnsworth2022/05/18 03:03 AM
                                    Backward Compatibility for SVE2 CodeDoug S2022/05/18 10:14 AM
                                      Backward Compatibility for SVE2 Codedmcq2022/05/20 05:43 AM
                                        Backward Compatibility for SVE2 CodeDoug S2022/05/20 10:07 AM
                                          Backward Compatibility for SVE2 Codedmcq2022/05/21 08:35 AM
                                            Backward Compatibility for SVE2 Codedmcq2022/05/21 08:57 AM
                                  Backward Compatibility for SVE2 Code---2022/05/18 09:56 AM
                      Backward Compatibility for SVE2 CodeJan Wassenberg2022/05/17 12:26 PM
                        Backward Compatibility for SVE2 Code---2022/05/17 03:01 PM
                        Use of Highway to provide backward compatibilityCharlie Burnes2022/05/18 03:55 PM
                          Use of Highway to provide backward compatibilityBrett2022/05/18 08:57 PM
                            Use of Highway to provide backward compatibilityJan Wassenberg2022/05/18 10:16 PM
                              Use of Highway to provide backward compatibilityCharlie Burnes2022/05/18 11:03 PM
                                Use of Highway to provide backward compatibilityBrett2022/05/18 11:20 PM
                                  Use of Highway to provide backward compatibility---2022/05/19 01:20 PM
                                    Use of Highway to provide backward compatibilityCharlie Burnes2022/05/19 03:05 PM
                                      Use of Highway to provide backward compatibilityBrett2022/05/19 04:18 PM
                                        Use of Highway to provide backward compatibilityCharlie Burnes2022/05/19 07:29 PM
                                          Use of Highway to provide backward compatibilityJan Wassenberg2022/05/19 09:12 PM
                                            Use of Highway to provide backward compatibilityBrett2022/05/19 10:38 PM
                                            Use of Highway to provide backward compatibilityCharlie Burnes2022/05/21 07:48 AM
                                              Use of Highway to provide backward compatibilityCharlie Burnes2022/05/21 12:36 PM
                                              Use of Highway to provide backward compatibilityJan Wassenberg2022/05/21 10:45 PM
                                                Use of Highway to provide backward compatibilityCharlie Burnes2022/05/22 07:52 AM
        Questions About Apple's AVX512dmcq2022/05/13 04:24 PM
      Questions About Apple's AVX512Matt Lohmann2022/05/13 01:32 PM
        Questions About Apple's AVX512---2022/05/13 02:09 PM
        Questions About Apple's AVX512Anon12022/05/13 03:55 PM
          Questions About Apple's AVX512Matt Lomann2022/05/13 07:02 PM
            Questions About Apple's AVX512---2022/05/13 09:03 PM
            Questions About Apple's AVX512Simon Farnsworth2022/05/14 06:11 AM
              Questions About Apple's AVX512---2022/05/14 12:06 PM
        Questions About Apple's AVX512Adrian2022/05/14 12:35 AM
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