Read Only Page Corrections

By: rwessel (rwessel.delete@this.yahoo.com), January 7, 2021 12:00 pm
Room: Moderated Discussions
Terry Gray (cuyahogan.delete@this.aol.com) on January 7, 2021 9:47 am wrote:
> Jörn Engel (joern.delete@this.purestorage.com) on January 7, 2021 9:05 am wrote:
> > Emanuel Rylke (ema.delete@this.mailbox.org) on January 7, 2021 12:49 am wrote:
> > >
> > > What about doing it not as a workaround for broken hardware
> > > but to make it more easy to show that the hardware
> > > is broken? In theory I know that I'm probably getting bit
> > > errors and that's bad(TM) but if a cat /proc/bit_errors
> > > showed me that I got at least 5 since boot I would be much more motivated to do something about it.
> >
> > Unrealistic for writable pages. Doable for read-only. You need a bit of shadow memory to store
> > the checksums and some fast hash function. Assuming you cannot use vector instructions, performance
> > would be 16 bytes per cycle or 256 cycles per page. You should calculate hashes when pages turn
> > read-only, again before they become writable and maybe periodically in between.
> >
> > Do you care enough to write a patch?
>
> Back in the 1960s Oregon State University had a CDC 3300 (24 bit computer).
>
> Some of the other students I shared an office with wrote an operating system for it called OS3
> (Oregon State Open Shop Operating System).
>
> It had parity memory and to recover from errors in progrem code each sector had an exclusive OR
> of the contents as the last word in a sector. When an error occurred the word in error was known
> so they could calculate what that word should have been. So this idea is not new. But interesting
> that I have never heard of it being used anywhere else (although it may have been).


That's just RAID 4, if applied to disks.

And that's the basic idea behind RAIM or chipkill style systems.
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TopicPosted ByDate
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    Ryzen 9 5000 series processor Dummond D. Slow2020/12/29 11:33 AM
      Ryzen 9 5000 series processor Phil9955112020/12/29 05:09 PM
        Ryzen 9 5000 series processor Dummond D. Slow2020/12/29 07:00 PM
          Ryzen 9 5000 series processor anon2020/12/30 03:50 AM
          Ryzen 9 5000 series processor Foo_2020/12/30 03:50 AM
            Ryzen 9 5000 series processor Phil9955112020/12/30 06:22 AM
              Ryzen 9 5000 series processor Phil9955112020/12/30 06:25 AM
              Ryzen 9 5000 series processor Adrian2020/12/30 07:00 AM
            Ryzen 9 5000 series processor Linus Torvalds2020/12/30 01:00 PM
              Ryzen 9 5000 series processor Phil9955112020/12/31 07:45 AM
                Ryzen 9 5000 series processor Adrian2020/12/31 10:49 AM
                Ryzen 9 5000 series processor Linus Torvalds2020/12/31 01:05 PM
                  Ryzen 9 5000 series processor me2020/12/31 05:56 PM
                    Ryzen 9 5000 series processor Anon2020/12/31 06:48 PM
                      Ryzen 9 5000 series processor me2021/01/01 05:06 AM
                    Ryzen 9 5000 series processor Gabriele Svelto2021/01/01 08:10 AM
                      Ryzen 9 5000 series processor David Hess2021/01/01 08:37 AM
                        Ryzen 9 5000 series processor Jukka Larja2021/01/01 11:52 AM
                          Ryzen 9 5000 series processor Linus Torvalds2021/01/01 01:48 PM
                            Ryzen 9 5000 series processor Jukka Larja2021/01/01 11:28 PM
                              Ryzen 9 5000 series processor Linus Torvalds2021/01/02 01:21 PM
                                Ryzen 9 5000 series processor Adrian2021/01/02 02:17 PM
                                Ryzen 9 5000 series processor Anon2021/01/02 07:08 PM
                                Ryzen 9 5000 series processor Jukka Larja2021/01/03 12:10 AM
                                  Ryzen 9 5000 series processor David Hess2021/01/03 02:03 AM
                                    Ryzen 9 5000 series processor Jukka Larja2021/01/03 04:28 AM
                                  Threadrippers do have official ECC supportJukka Larja2021/01/03 09:32 PM
                                    Threadrippers do have official ECC supportBjörn Ragnar Björnsson2021/01/04 09:21 AM
                                ECC (or lack of)Tim McCaffrey2021/01/03 10:28 AM
                                  ECC (or lack of)Adrian2021/01/03 02:14 PM
                                    ECC (or lack of)Yuhong Bao2021/01/03 02:51 PM
                                      ECC (or lack of)Yuhong Bao2021/01/04 07:54 PM
                                        ECC (or lack of)Yuhong Bao2021/01/04 08:04 PM
                                AMD ECC not enabled but says it isIan Cutress2021/01/03 12:09 PM
                                  AMD ECC not enabled but says it isMaxwell2021/01/03 01:28 PM
                                  AMD ECC not enabled but says it isAdrian2021/01/03 01:50 PM
                                    AMD ECC not enabled but says it isGabriele Svelto2021/01/03 02:08 PM
                                      AMD ECC not enabled but says it isAdrian2021/01/03 02:34 PM
                                        AMD ECC not enabled but says it isDan Strother2021/01/03 08:00 PM
                                          AMD ECC not enabled but says it isMatt2021/01/04 01:29 AM
                                          AMD ECC not enabled but says it isGabriele Svelto2021/01/04 02:29 AM
                                            AMD ECC not enabled but says it isMatt2021/01/04 01:39 PM
                                          AMD ECC not enabled but says it isAdrian2021/01/04 06:49 AM
                                Ryzen 9 5000 series processor Jason Snyder2021/01/04 02:44 PM
                                  Ryzen 9 5000 series processor Brett2021/01/04 06:08 PM
                                  Ryzen 9 5000 series processor Linus Torvalds2021/01/05 01:29 PM
                                    Ryzen 9 5000 series processor Adrian2021/01/05 02:08 PM
                                    Ryzen 9 5000 series processor Emil Briggs2021/01/05 05:40 PM
                                      Ryzen 9 5000 series processor Gabriele Svelto2021/01/06 02:12 AM
                                    Ryzen 9 5000 series processor [ECC summary - Suitable for framing]Björn Ragnar Björnsson2021/01/05 07:29 PM
                                    Ryzen 9 5000 series processor 2021/01/06 10:45 AM
                                      Ryzen 9 5000 series processor Linus Torvalds2021/01/06 12:38 PM
                                        Ryzen 9 5000 series processor Emanuel Rylke2021/01/07 01:49 AM
                                          Ryzen 9 5000 series processor Jörn Engel2021/01/07 10:05 AM
                                            Read Only Page CorrectionsTerry Gray2021/01/07 10:47 AM
                                              Read Only Page Correctionsrwessel2021/01/07 12:00 PM
                                                Read Only Page CorrectionsTerry Gray2021/01/07 12:58 PM
                                              Read Only Page CorrectionsDavid Hess2021/01/10 08:37 PM
                                              Read Only Page Correctionsdmcq2021/01/11 04:32 AM
                                        Ryzen 9 5000 series processor Chester2021/01/07 06:00 AM
                                          Ryzen 9 5000 series processor Gabriele Svelto2021/01/07 06:33 AM
                                            Ryzen 9 5000 series processor Michael S2021/01/07 09:05 AM
                                              Ryzen 9 5000 series processor Linus Torvalds2021/01/07 11:26 AM
                                            Ryzen 9 5000 series processor rwessel2021/01/07 10:06 AM
                                          Ryzen 9 5000 series processor Linus Torvalds2021/01/07 11:04 AM
                                            Ryzen 9 5000 series processor Chester2021/01/07 05:19 PM
                                              OT L1 chache ECCMichael S2021/01/08 03:31 AM
                                                OT L1 chache ECCAdrian2021/01/08 09:54 AM
                                                  OT L1 chache ECCDavid Kanter2021/01/08 10:13 AM
                                                    Structure ProtectionsChester2021/01/08 03:14 PM
                                            Ryzen 9 5000 series processor Etienne Lorrain2021/01/08 02:18 AM
                                          Ryzen 9 5000 series processor Björn Ragnar Björnsson2021/01/07 06:42 PM
                                            Ryzen 9 5000 series processor Chester2021/01/07 09:14 PM
                                              Ryzen 9 5000 series processor Björn Ragnar Björnsson2021/01/07 09:26 PM
                                                Ryzen 9 5000 series processor Michael S2021/01/08 03:49 AM
                                    Ryzen 9 5000 series processor Jason Snyder2021/01/14 08:32 AM
                                      Ryzen 9 5000 series processor Gabriele Svelto2021/01/15 06:26 AM
                                        Ryzen 9 5000 series processor Jason Snyder2021/01/16 11:45 AM
                                          Ryzen 9 5000 series processor Jason Snyder2021/01/16 01:27 PM
                              Ryzen 9 5000 series processor Etienne Lorrain2021/01/07 02:21 AM
                                Ryzen 9 5000 series processor anon2021/01/07 03:21 AM
                                  Ryzen 9 5000 series processor Etienne Lorrain2021/01/07 04:22 AM
                                    Ryzen 9 5000 series processor Konrad Schwarz2021/01/07 06:27 AM
                                  Ryzen 9 5000 series processor Adrian2021/01/07 05:22 AM
                                  Ryzen 9 5000 series processor rwessel2021/01/07 10:25 AM
                                    Ryzen 9 5000 series processor Jörn Engel2021/01/07 05:29 PM
                                      Ryzen 9 5000 series processor rwessel2021/01/07 07:47 PM
                                        Ryzen 9 5000 series processor David Hess2021/01/11 05:26 AM
                                          Ryzen 9 5000 series processor Adrian2021/01/11 06:25 AM
                                          Ryzen 9 5000 series processor rwessel2021/01/11 08:24 AM
                                      Ryzen 9 5000 series processor Mark Roulo2021/01/07 08:00 PM
                                        Ryzen 9 5000 series processor Björn Ragnar Björnsson2021/01/07 08:20 PM
                                  Ryzen 9 5000 series processor David Hess2021/01/11 05:16 AM
                      Ryzen 9 5000 series processor Jukka Larja2021/01/01 11:43 AM
                        Ryzen 9 5000 series processor David Hess2021/01/01 01:31 PM
                          Ryzen 9 5000 series processor Dan Strother2021/01/01 02:12 PM
                        Ryzen 9 5000 series processor Adrian2021/01/01 02:28 PM
                          Ryzen 9 5000 series processor vs. M1Adrian2021/01/02 03:45 AM
                            Ryzen 9 5000 series processor vs. M1Dummond D. Slow2021/01/02 01:50 PM
                              Ryzen 9 5000 series processor vs. M1Adrian2021/01/02 03:00 PM
                                Ryzen 9 5000 series processor vs. M1Dummond D. Slow2021/01/04 01:11 PM
                            Ryzen 9 5000 series processor vs. M1Dummond D. Slow2021/01/07 11:43 AM
                              Ryzen 9 5000 series processor vs. M1Adrian2021/01/08 09:28 AM
                                Ryzen 9 5000 series processor vs. M1 Sorry, typo, correction hereAdrian2021/01/08 09:31 AM
                                  Ryzen 9 5000 series processor vs. M1 (vs. Rocket Lake)Dummond D. Slow2021/01/22 08:02 AM
                            isn't that an interesting contradiction?hobold2021/01/08 01:44 PM
                              isn't that an interesting contradiction?Maynard Handley2021/01/08 02:27 PM
                              isn't that an interesting contradiction?Adrian2021/01/08 03:21 PM
                                isn't that an interesting contradiction?Maynard Handley2021/01/08 04:59 PM
                                  isn't that an interesting contradiction?Maynard Handley2021/01/08 05:34 PM
                                    isn't that an interesting contradiction?Maynard Handley2021/01/08 05:34 PM
                                    isn't that an interesting contradiction?Maynard Handley2021/01/08 05:35 PM
                                      isn't that an interesting contradiction?Adrian2021/01/09 01:55 AM
                                  isn't that an interesting contradiction?Adrian2021/01/09 01:48 AM
                                    isn't that an interesting contradiction? - gmpAdrian2021/01/09 09:00 AM
                                      isn't that an interesting contradiction? - gmpnone2021/01/11 02:26 AM
                                        isn't that an interesting contradiction? - gmpAdrian2021/01/11 05:34 AM
                                          Fully agree with you, I was just giving some data :-) (NT)none2021/01/11 06:17 AM
                                          isn't that an interesting contradiction? - gmpanon2021/01/11 01:09 PM
                                            isn't that an interesting contradiction? - gmpAdrian2021/01/12 01:54 AM
                                              isn't that an interesting contradiction? - gmpnone2021/01/12 02:15 AM
                                                isn't that an interesting contradiction? - gmpAdrian2021/01/12 04:37 AM
                                                  isn't that an interesting contradiction? - gmpnone2021/01/12 04:53 AM
                                                    uses of int multiplyhobold2021/01/12 03:51 PM
                                                      uses of int multiplynone2021/01/13 02:11 AM
                                                      uses of int multiplyJörn Engel2021/01/13 01:06 PM
                                                  isn't that an interesting contradiction? - gmpWilco2021/01/12 05:17 AM
                                                    isn't that an interesting contradiction? - gmpAdrian2021/01/12 06:07 AM
                        Ryzen 9 5000 series processor Gabriele Svelto2021/01/01 04:31 PM
                          Ryzen 9 5000 series processor Jukka Larja2021/01/01 10:58 PM
                            Ryzen 9 5000 series processor Gabriele Svelto2021/01/02 06:51 AM
                              Ryzen 9 5000 series processor Jukka Larja2021/01/02 08:57 AM
                                Ryzen 9 5000 series processor me2021/01/02 05:30 PM
                                  Ryzen 9 5000 series processor Jukka Larja2021/01/02 11:43 PM
                        Ryzen 9 5000 series processor Björn Ragnar Björnsson2021/01/01 09:41 PM
                          Ryzen 9 5000 series processor Jukka Larja2021/01/01 10:53 PM
                            Ryzen 9 5000 series processor Adrian2021/01/02 02:03 AM
                              Ryzen 9 5000 series processor Jukka Larja2021/01/02 08:39 AM
                          Ryzen 9 5000 series processor Adrian2021/01/02 01:52 AM
                          Ryzen 9 5000 series processor me2021/01/02 06:56 AM
                            Ryzen 9 5000 series processor Michael S2021/01/02 12:41 PM
                              Ryzen 9 5000 series processor Adrian2021/01/02 01:43 PM
                              Ryzen 9 5000 series processor Jukka Larja2021/01/02 11:50 PM
                          Crucial/Micron ECC UDIMMsGabriele Svelto2021/01/02 07:09 AM
                            Crucial/Micron ECC UDIMMsMaxwell2021/01/02 10:45 AM
                              Crucial/Micron ECC UDIMMsYuhong Bao2021/01/02 07:29 PM
                  Ryzen 9 5000 series processor Phil9955112021/01/03 08:46 AM
  Ryzen 9 5000 series processor H_Heckuba2021/01/03 01:06 PM
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