POWER guys commented on this years ago ...

By: Aaron Spink (aaronspink.delete@this.notearthlink.net), August 26, 2014 11:51 pm
Room: Moderated Discussions
anon (anon.delete@this.anon.com) on August 26, 2014 11:02 pm wrote:
> Now that doesn't necessarily say anything about forward progress of a particular CPU, only
> general forward progress. So a single CPU may get stuck forever if there is contention from
> others. However I did get the idea that POWER implementations do provide for some fairness
> and per-thread forward progress. Which would be a consequence of allowing cacheline to be
> held exclusive for specific sequence of instructions between lwarx and stwcx.
>
What is likely happening in the actual hardware is that the hardware will temporarily pin the line in E/M state long enough for the LL/SC to complete which can be done if you can guarantee that the LL/SC will complete in limited finite time. What's like happening beyond that is forward state chaining by the coherency engines. AKA, 3 requests come in from Pa,Pb,Pc for line Lx. Pa is first and the coherency engine gives it the line first, but as soon as it acknowledges state of the line, the coherency engine sends it a FWD(Lx,Pb) and similarly as soon as Pb acks the line state, it gets a FWD(Lx,Pc).

Pretty much all interconnection network based coherent system have a single coherency master per line(but generally multiple masters split by address space). And, as far as I'm aware, they all support E/M state FWDing and chaining as its a pretty common case. Now old school master-less bus based systems or a nack based interconnection network coherence system can run into starvation issues and require extra steps to break out of it. For nack/bus based systems, this is because instead of queuing (either in a dedicated ordered queue or on the network), it basically throws a retry for the requests it doesn't accept. Though I'm pretty sure there aren't any modern coherence systems left that are nack/retry based as modern hardware can easily support either in network or at CC queuing for all requests. EV7 used a combination of in network and at CC queuing and something like QPI uses full pre-allocation.

> I'm not sure if I understand you correctly. I think I failed to explain myself properly: the CAS
> problem I heard of is not due to the instruction itself failing to make forward progress, or the
> entire system failing to make forward progress, but due to the software constructs that use it,
> failing to be able to achieve a livelock-free sequence of instructions on a per-thread basis.
>

Ah, so you are talking about the Fetch_and_Add case. Well most CAS based coherence systems have FTCH_ADD as a standard primitive so won't ever run into an issue.

> Let's take the simple case of an atomic increment. A CAS architecture will have to do something like:
>
> retry:
> LD r1 := [mem]
> ADD r1 := r1 + 1
> CAS [mem], r1
> CMP failure case
> BEQ retry
>
> Now unless the ISA or implementation also defines very specific sequences leading up to the CAS instruction
> as being "special", with respect to forward progress of the thread, then it's possible that other CPUs
> will always modify the location between the LD and the CAS, and thus this thread always fails.
>
This is basically a bad way to use CAS.


> LL/SC can solve that problem in hardware. A CAS architecture could too, but it would
> either need some fancy detection/prediction and treatment of LD that comes ahead of
> the CAS, or it needs an LD variant which is to be used before the CAS, with particular
> limited instructions between (in which case you're basically back to LL/SC).
>
> Not that it's a canonical definition of the ISA or any
> particular implementation, but Linux's SPARC port has:
>
>

> .globl atomic_add
> .type atomic_add,#function
> atomic_add: /* %o0 = increment, %o1 = atomic_ptr */
> BACKOFF_SETUP(%o2)
> 1: lduw [%o1], %g1
> add %g1, %o0, %g7
> cas [%o1], %g1, %g7
> cmp %g1, %g7
> bne,pn %icc, BACKOFF_LABEL(2f, 1b)
> nop
> retl
> nop
> 2: BACKOFF_SPIN(%o2, %o3, 1b)
> .size atomic_add, .-atomic_add
>

>
> Where BACKOFF* are defined for SMP kernels as doing some
> amount of busy waiting before trying the sequence again.
>
Yeah this is a case of basically a detriment in the SPARC ISA where they used CAS but didn't also use FTCH_ADD.
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                                            "Intel no longer has an obvious lead in process technology" [electronicsweekly]Kira2014/08/16 09:07 AM
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                                                "Intel no longer has an obvious lead in process technology" [electronicsweekly]Doug S2014/08/16 10:28 AM
                                                  "Intel no longer has an obvious lead in process technology" [electronicsweekly]juanrga2014/08/16 12:01 PM
                                                    "Intel no longer has an obvious lead in process technology" [electronicsweekly]tarlinian2014/08/16 01:56 PM
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                                            "Intel no longer has an obvious lead in process technology" [electronicsweekly]Aaron Spink2014/08/16 09:10 PM
                                              "Intel no longer has an obvious lead in process technology" [electronicsweekly]dmcq2014/08/17 02:58 AM
                                              "Intel no longer has an obvious lead in process technology" [electronicsweekly]Maynard Handley2014/08/17 10:06 AM
                                                "Intel no longer has an obvious lead in process technology" [electronicsweekly]tarlinian2014/08/17 10:40 AM
                                                  "Intel no longer has an obvious lead in process technology" [electronicsweekly]Maynard Handley2014/08/17 12:37 PM
                                                    "Intel no longer has an obvious lead in process technology" [electronicsweekly]tarlinian2014/08/17 01:12 PM
                                                    "Intel no longer has an obvious lead in process technology" [electronicsweekly]Alberto2014/08/17 01:12 PM
                                                    "Intel no longer has an obvious lead in process technology" [electronicsweekly]Michael S2014/08/17 01:15 PM
                                                      "Intel no longer has an obvious lead in process technology" [electronicsweekly]Maynard Handley2014/08/17 01:45 PM
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                                                          "Intel no longer has an obvious lead in process technology" [electronicsweekly]Maynard Handley2014/08/17 04:10 PM
                                                            "Intel no longer has an obvious lead in process technology" [electronicsweekly]tarlinian2014/08/17 05:08 PM
                                                            "Intel no longer has an obvious lead in process technology" [electronicsweekly]Klimax2014/08/17 10:42 PM
                                                              "Intel no longer has an obvious lead in process technology" [electronicsweekly]Maynard Handley2014/08/18 01:21 PM
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                                        I agreeDavid Hess2014/08/17 03:24 PM
                                      I agreeRonald Maas2014/08/15 11:14 PM
                                        I agreedmcq2014/08/16 03:53 AM
                                          Beyond web serversjuanrga2014/08/16 04:55 AM
                                            Beyond web serversdmcq2014/08/16 05:40 AM
                                              Beyond web serversjuanrga2014/08/16 11:43 AM
                                                Beyond web serversAaron Spink2014/08/16 10:07 PM
                                                  Beyond web serversjuanrga2014/08/17 02:35 PM
                                                    Beyond web serversAaron Spink2014/08/17 04:24 PM
                                                      Beyond web serversdmcq2014/08/18 05:50 AM
                                                        Beyond web serversAaron Spink2014/08/18 03:58 PM
                                            Beyond web serversMichael S2014/08/16 12:43 PM
                                              Beyond web serversjuanrga2014/08/16 12:55 PM
                                                Beyond web serversMichael S2014/08/16 01:04 PM
                                                  Beyond web serversjuanrga2014/08/17 08:19 AM
                                                    Beyond web serversrwessel2014/08/17 09:34 AM
                                                    Beyond web serversDavid Kanter2014/08/17 10:23 AM
                                                      Beyond web serversMichael S2014/08/17 11:04 AM
                                                        Beyond web serversRicardo B2014/08/17 11:37 AM
                                                          Beyond web serversDavid Kanter2014/08/17 12:31 PM
                                                      Beyond web serversjuanrga2014/08/17 04:59 PM
                                                        Beyond web serversDavid Kanter2014/08/17 06:42 PM
                                                          Beyond web serversjuanrga2014/08/18 02:39 PM
                                              Beyond web serversGabriele Svelto2014/08/16 11:33 PM
                                                Beyond web serversRonald Maas2014/08/17 09:06 AM
                                                  Amdahl's law (NT)Michael S2014/08/17 11:08 AM
                                                Beyond web serversjuanrga2014/08/17 02:41 PM
                                      Xeon-class performancePaul A. Clayton2014/08/16 10:31 AM
                                        Xeon-class performancejuanrga2014/08/16 11:53 AM
                                          Xeon-class performanceKlimax2014/08/17 02:29 PM
                              Design targets aren't datadistantobserver2014/08/16 12:22 PM
                      x86 theoretical limit on maximum performance.Kevin G2014/08/10 10:26 PM
                    A strong answer to this crap article on Extremetechanon2014/08/10 05:25 PM
                      A strong answer to this crap article on ExtremetechDavid Kanter2014/08/10 09:15 PM
                        A strong answer to this crap article on ExtremetechExophase2014/08/10 10:03 PM
                          A strong answer to this crap article on ExtremetechAaron Spink2014/08/11 12:33 AM
                            A strong answer to this crap article on Extremetechnone2014/08/11 01:35 AM
                              A strong answer to this crap article on Extremetechnope2014/08/11 02:05 AM
                              A strong answer to this crap article on ExtremetechAaron Spink2014/08/11 04:02 AM
                            A strong answer to this crap article on ExtremetechRicardo B2014/08/11 04:04 AM
                  A strong answer to this crap article on ExtremetechMegol2014/08/11 08:10 AM
                    A strong answer to this crap article on Extremetechanon2014/08/11 08:44 PM
              A strong answer to this crap article on ExtremetechGabriele Svelto2014/08/10 12:37 AM
                A strong answer to this crap article on Extremetechjuanrga2014/08/10 06:07 AM
                A strong answer to this crap article on Extremetechanon2014/08/11 05:13 AM
                  A strong answer to this crap article on ExtremetechGabriele Svelto2014/08/11 12:08 PM
                    A strong answer to this crap article on Extremetechanon2014/08/11 09:32 PM
              A strong answer to this crap article on ExtremetechMichael S2014/08/10 03:11 AM
                A strong answer to this crap article on Extremetechanon2014/08/10 05:27 PM
                  A strong answer to this crap article on ExtremetechMichael S2014/08/10 11:30 PM
                    A strong answer to this crap article on Extremetechanon2014/08/11 03:56 AM
                      A strong answer to this crap article on ExtremetechMichael S2014/08/11 05:23 AM
                        A strong answer to this crap article on Extremetechanon2014/08/11 06:29 AM
                      A strong answer to this crap article on ExtremetechMegol2014/08/11 08:30 AM
                        A strong answer to this crap article on Extremetechanon2014/08/11 08:46 PM
                          A strong answer to this crap article on ExtremetechMegol2014/08/12 05:48 AM
                            A strong answer to this crap article on ExtremetechMegol2014/08/13 09:25 AM
                              A strong answer to this crap article on Extremetechanon2014/08/13 04:55 PM
          A strong answer to this crap article on ExtremetechDavid Kanter2014/08/08 11:36 PM
            A strong answer to this crap article on Extremetechanon2014/08/09 12:12 AM
              A strong answer to this crap article on Extremetechdmcq2014/08/09 03:00 AM
              A strong answer to this crap article on ExtremetechAaron Spink2014/08/09 03:54 AM
                A strong answer to this crap article on Extremetechanon2014/08/10 09:50 PM
                  A strong answer to this crap article on ExtremetechExophase2014/08/10 10:35 PM
                    A strong answer to this crap article on Extremetechanon2014/08/11 04:20 AM
                  A strong answer to this crap article on ExtremetechAaron Spink2014/08/11 12:48 AM
                    A strong answer to this crap article on Extremetechanon2014/08/11 04:10 AM
                      A strong answer to this crap article on ExtremetechMichael S2014/08/11 05:43 AM
                        A strong answer to this crap article on Extremetechanon2014/08/11 06:21 AM
            A strong answer to this crap article on Extremetechjuanrga2014/08/09 06:38 AM
              ISA doesn't matterDavid Kanter2014/08/09 10:50 AM
                ISA doesn't matterBrett2014/08/09 11:51 AM
                  ISA doesn't matterLinus Torvalds2014/08/09 01:36 PM
                    ISA doesn't matterBrett2014/08/09 10:37 PM
                      ISA doesn't matterMichael S2014/08/10 02:21 AM
                        ISA doesn't matterdmcq2014/08/10 04:06 AM
                        ISA doesn't matterBrett2014/08/10 02:21 PM
                          ISA doesn't matteranon2014/08/10 09:03 PM
                            ISA doesn't matterBrett2014/08/10 11:45 PM
                              ISA doesn't matterAaron Spink2014/08/11 12:57 AM
                              ISA doesn't matteranon2014/08/11 04:18 AM
                                ISA doesn't matterBrett2014/08/16 03:38 PM
                              ISA doesn't matter -- PARMAook2014/08/26 11:50 AM
                          IBM fab business is losing money, the POWER line is notMark Roulo2014/08/11 07:44 AM
                    ISA doesn't matterTREZA2014/08/10 04:27 AM
                    ISA doesn't matterjuanrga2014/08/10 05:34 AM
                      ISA doesn't matterMichael S2014/08/10 06:01 AM
                        ISA does matterjuanrga2014/08/11 07:28 PM
                          ISA does matterMichael S2014/08/12 01:20 AM
                            ISA does matterjuanrga2014/08/12 02:38 AM
                              ISA does matterAaron Spink2014/08/12 03:06 AM
                                ISA does matterjuanrga2014/08/12 03:27 AM
                                  ISA does matterUngo2014/08/12 03:28 PM
                                    ISA does matterjuanrga2014/08/12 03:43 PM
                                      Banning of Juanrgagallier22014/08/13 08:56 AM
                                        bad idea (NT)Michael S2014/08/13 09:02 AM
                      ISA doesn't matterAaron Spink2014/08/10 07:48 AM
                      Best *Student* Paper Paul A. Clayton2014/08/10 12:31 PM
                ISA doesn't matterjuanrga2014/08/10 04:32 AM
                  ISA doesn't matterWilco2014/08/10 05:48 AM
                    ISA doesn't matterLinus Torvalds2014/08/10 11:38 AM
                      ISA doesn't matterUngo2014/08/11 03:59 PM
                ISA doesn't matterEtienne2014/08/11 07:17 AM
                  ISA doesn't matterGabriele Svelto2014/08/12 11:31 PM
                    ISA doesn't matterEtienne2014/08/13 03:09 AM
          A strong answer to this crap article on ExtremetechAaron Spink2014/08/09 03:44 AM
            A strong answer to this crap article on Extremetechjuanrga2014/08/09 06:43 AM
              A strong answer to this crap article on Extremetechanon2014/08/09 10:17 AM
                A strong answer to this crap article on ExtremetechMichael S2014/08/09 12:38 PM
                  A strong answer to this crap article on ExtremetechAlberto2014/08/09 01:41 PM
                  A strong answer to this crap article on ExtremetechWilco2014/08/09 01:49 PM
                    A strong answer to this crap article on ExtremetechAlberto2014/08/09 02:13 PM
                      A strong answer to this crap article on ExtremetechWilco2014/08/09 02:30 PM
                        A strong answer to this crap article on ExtremetechAlberto2014/08/09 03:15 PM
                        A strong answer to this crap article on Extremetechcarop2014/08/10 02:01 AM
                          A strong answer to this crap article on ExtremetechWilco2014/08/10 04:50 AM
                            A strong answer to this crap article on ExtremetechMichael S2014/08/10 06:23 AM
                              A strong answer to this crap article on ExtremetechWilco2014/08/10 06:38 AM
                                Thank you (NT)Michael S2014/08/10 07:16 AM
                                Nope, Samsung ARM cpu was canned.Alberto2014/08/11 02:57 AM
                                  Nope, Samsung ARM cpu was canned.Wilco2014/08/11 03:14 AM
                                  Nope, Samsung ARM cpu was canned.David Hess2014/08/11 11:56 AM
                                    Nope, Samsung ARM cpu was canned.juanrga2014/08/11 07:32 PM
                              ISA does matterjuanrga2014/08/11 07:34 PM
                          A strong answer to this crap article on Extremetechjuanrga2014/08/10 06:19 AM
                      A strong answer to this crap article on ExtremetechWilco2014/08/09 03:10 PM
                        A strong answer to this crap article on ExtremetechMichael S2014/08/10 03:01 AM
                        A strong answer to this crap article on ExtremetechAlberto2014/08/10 06:17 AM
                A strong answer to this crap article on Extremetechjuanrga2014/08/10 03:40 AM
                  A strong answer to this crap article on ExtremetechMichael S2014/08/10 04:27 AM
                    A strong answer to this crap article on ExtremetechWilco2014/08/10 05:00 AM
                      A strong answer to this crap article on ExtremetechMichael S2014/08/10 05:50 AM
                        A strong answer to this crap article on ExtremetechWilco2014/08/10 06:51 AM
                      A strong answer to this crap article on ExtremetechAaron Spink2014/08/10 08:04 AM
                        A strong answer to this crap article on ExtremetechWilco2014/08/10 08:30 AM
                          A strong answer to this crap article on ExtremetechAaron Spink2014/08/10 08:46 AM
                            A strong answer to this crap article on ExtremetechWilco2014/08/11 05:37 PM
                              A strong answer to this crap article on ExtremetechMichael S2014/08/12 01:58 AM
                                A strong answer to this crap article on ExtremetechAaron Spink2014/08/12 02:11 AM
                                  A strong answer to this crap article on ExtremetechMichael S2014/08/12 02:22 AM
                                    A strong answer to this crap article on ExtremetechAaron Spink2014/08/12 02:40 AM
                                Applied Micro systems not benchmarkedDavid Kanter2014/08/13 11:29 AM
                                  Applied Micro systems not benchmarkedjuanrga2014/08/13 11:51 AM
                          A strong answer to this crap article on ExtremetechMichael S2014/08/10 08:48 AM
                            A strong answer to this crap article on ExtremetechAaron Spink2014/08/10 09:19 AM
                    A strong answer to this crap article on Extremetechjuanrga2014/08/10 06:00 AM
                      A strong answer to this crap article on ExtremetechMichael S2014/08/10 06:18 AM
                        A strong answer to this crap article on ExtremetechJouni Osmala2014/08/10 02:12 PM
                          A strong answer to this crap article on Extremetechdmcq2014/08/10 02:43 PM
          A strong answer to this crap article on ExtremetechRonald Maas2014/08/10 10:56 PM
            A strong answer to this crap article on ExtremetechpTmd2014/08/11 12:57 AM
            A strong answer to this crap article on ExtremetechAaron Spink2014/08/11 01:02 AM
              ISA importance and bike sheddingPaul A. Clayton2014/08/11 02:39 AM
              A strong answer to this crap article on ExtremetechJouni Osmala2014/08/11 03:43 AM
                A strong answer to this crap article on ExtremetechMichael S2014/08/11 05:56 AM
                  A strong answer to this crap article on ExtremetechJouni Osmala2014/08/11 12:14 PM
            ISA does matterjuanrga2014/08/11 07:48 PM
              ISA does matterUngo2014/08/12 04:37 PM
                ISA does matterjuanrga2014/08/13 05:18 AM
            Look at the system level, ISA doesn't matterDavid Kanter2014/08/13 11:47 AM
              POWER guys commented on this years ago ...Mark Roulo2014/08/14 08:30 AM
                POWER guys commented on this years ago ...juanrga2014/08/16 04:29 AM
                  POWER guys commented on this years ago ...Maynard Handley2014/08/16 09:35 AM
                    POWER guys commented on this years ago ...juanrga2014/08/16 11:35 AM
                    POWER guys commented on this years ago ...Michael S2014/08/16 12:55 PM
                      POWER guys commented on this years ago ...Maynard Handley2014/08/16 02:24 PM
                        POWER guys commented on this years ago ...Michael S2014/08/16 02:54 PM
                          POWER guys commented on this years ago ...Maynard Handley2014/08/16 03:56 PM
                        POWER guys commented on this years ago ...Michael S2014/08/16 03:02 PM
                        POWER guys commented on this years ago ...David Kanter2014/08/16 04:09 PM
                        POWER guys commented on this years ago ...Ricardo B2014/08/16 05:43 PM
                          POWER guys commented on this years ago ...Maynard Handley2014/08/16 06:35 PM
                            POWER guys commented on this years ago ...Ricardo B2014/08/16 07:17 PM
                              OS/2Ricardo B2014/08/16 07:20 PM
                              POWER guys commented on this years ago ...rwessel2014/08/16 09:36 PM
                              POWER guys commented on this years ago ...Maynard Handley2014/08/17 12:24 PM
                                POWER guys commented on this years ago ...Ricardo B2014/08/17 01:41 PM
                                POWER guys commented on this years ago ...Gabriele Svelto2014/08/18 02:20 AM
                          POWER guys commented on this years ago ...rwessel2014/08/16 09:43 PM
                          POWER guys commented on this years ago ...Michael S2014/08/16 11:30 PM
                            POWER guys commented on this years ago ...Ricardo B2014/08/17 06:28 AM
                        POWER guys commented on this years ago ...Aaron Spink2014/08/16 10:25 PM
                          POWER guys commented on this years ago ...anon2014/08/17 12:10 AM
                            POWER guys commented on this years ago ...Aaron Spink2014/08/17 12:42 AM
                              POWER guys commented on this years ago ...anon2014/08/17 03:40 AM
                                POWER guys commented on this years ago ...Ricardo B2014/08/17 06:43 AM
                                  POWER guys commented on this years ago ...anon2014/08/17 07:53 AM
                                POWER guys commented on this years ago ...anon2014/08/17 07:42 AM
                              POWER guys commented on this years ago ...Ronald Maas2014/08/17 09:57 AM
                                POWER guys commented on this years ago ...rwessel2014/08/17 10:40 AM
                                POWER guys commented on this years ago ...Ricardo B2014/08/17 12:06 PM
                                  POWER guys commented on this years ago ...Aaron Spink2014/08/17 01:56 PM
                                  POWER guys commented on this years ago ...Michael S2014/08/17 02:22 PM
                                    POWER guys commented on this years ago ...Ricardo B2014/08/17 03:14 PM
                                      cheap membarsMichael S2014/08/17 05:56 PM
                                        cheap membarsnksingh2014/08/21 11:34 AM
                                          cheap membarsMichael S2014/08/21 12:31 PM
                                            cheap membarsnksingh2014/08/21 02:54 PM
                                              cheap membarsMichael S2014/08/21 06:40 PM
                                            cheap membarsanon2014/08/21 11:17 PM
                                              cheap membarsMichael S2014/08/22 03:16 AM
                                                cheap membarsanon2014/08/22 07:33 AM
                                                  cheap membarsMichael S2014/08/22 08:18 AM
                                                    cheap membarsanon2014/08/22 05:50 PM
                                                      cheap membarsPatrick Chase2014/08/24 11:06 AM
                                                        cheap membarsPatrick Chase2014/08/24 11:11 AM
                                                          cheap membarsanon2014/08/24 07:21 PM
                                                            cheap membarsPatrick Chase2014/08/25 11:02 AM
                                                              cheap membarsdmcq2014/08/30 02:15 AM
                                      POWER guys commented on this years ago ...anon2014/08/17 10:55 PM
                              POWER guys commented on this years ago ...Howard Chu2014/08/28 09:17 PM
                                POWER guys commented on this years ago ...Aaron Spink2014/08/29 07:35 AM
                                  POWER guys commented on this years ago ...Michael S2014/08/29 08:34 AM
                                  POWER guys commented on this years ago ...anon2014/08/29 03:49 PM
                                    POWER guys commented on this years ago ...foobar2014/08/30 09:26 PM
                                      POWER guys commented on this years ago ...dmcq2014/08/31 04:54 AM
                                        POWER guys commented on this years ago ...Wilco2014/08/31 12:52 PM
                          POWER guys commented on this years ago ...Maynard Handley2014/08/17 09:52 AM
                            POWER guys commented on this years ago ...Maynard Handley2014/08/17 10:31 AM
                              POWER guys commented on this years ago ...Gabriele Svelto2014/08/18 02:11 AM
                            POWER guys commented on this years ago ...nksingh2014/08/25 03:55 AM
                            POWER guys commented on this years ago ...Patrick Chase2014/08/25 11:15 AM
                              POWER guys commented on this years ago ...Patrick Chase2014/08/25 11:23 AM
                              POWER guys commented on this years ago ...nksingh2014/08/25 09:26 PM
                                POWER guys commented on this years ago ...Patrick Chase2014/08/25 11:32 PM
                                  POWER guys commented on this years ago ...Aaron Spink2014/08/26 04:41 AM
                                    POWER guys commented on this years ago ...anon2014/08/26 06:06 AM
                                      POWER guys commented on this years ago ...Aaron Spink2014/08/26 05:27 PM
                                        POWER guys commented on this years ago ...anon2014/08/26 11:02 PM
                                          POWER guys commented on this years ago ...Aaron Spink2014/08/26 11:51 PM
                                            POWER guys commented on this years ago ...anon2014/08/28 08:25 PM
                                              POWER guys commented on this years ago ...anon2014/08/28 10:45 PM
                                              POWER guys commented on this years ago ...rwessel2014/08/29 01:14 AM
                                                POWER guys commented on this years ago ...anon2014/08/29 03:49 AM
                                                  POWER guys commented on this years ago ...Michael S2014/08/29 06:43 AM
                                          POWER guys commented on this years ago ...nksingh2014/08/26 11:54 PM
                                        POWER guys commented on this years ago ...dmcq2014/08/27 02:29 AM
                                          POWER guys commented on this years ago ...dmcq2014/08/27 08:16 AM
                                    Idiom recognition for LL/SC?Paul A. Clayton2014/08/26 01:28 PM
                        POWER guys commented on this years ago ...Gabriele Svelto2014/08/16 11:22 PM
                      AltiVec was Power6 (NT)Kira2014/08/17 11:33 AM
                        AltiVec was Power6Maynard Handley2014/08/17 12:29 PM
                          AltiVec was Power6Kira2014/08/17 12:53 PM
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