memory errors

By: Carson (carson.delete@this.example.edu), March 6, 2021 6:44 am
Room: Moderated Discussions
David Hess (davidwhess.delete@this.gmail.com) on March 6, 2021 4:27 am wrote:
> Memory scrubbing is handled by the memory controller and not the operating system, so it has
> to be enabled after the memory is initialized which is easy enough in the BIOS. Caches are
> also scrubbed. Whether errors are reported to the operating system is configurable.

> My workstations have had ECC since the 1990s. Perhaps not coincidentally, they were
> only retired as they became obsolete rather than because of hardware failure.

It's worth remembering that you can have ECC with no firmware support at all if you're willing to accept a window of vulnerability at boot time.

With the AMD memory controllers, you enable ECC after boot with the following sequence:

  1. ECC error reporting OFF.

  2. Record ECC scrub address (setting to zero optional).

  3. ECC scrub rate to maximum.

  4. ECC scrubbing ON.

  5. Wait for ECC scrub address to wrap around.

  6. ECC scrub rate to something reasonable.

  7. ECC error reporting ON.


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TopicPosted ByDate
CPU & Memory bit flipsGanon2021/03/03 09:05 AM
  Also "Silent Data Corruption"Adrian2021/03/03 10:42 AM
    Thanks for the referenceGanon2021/03/03 11:47 AM
  Implications for linux page cacheanon2021/03/03 11:54 AM
    Implications for linux page cacheLinus Torvalds2021/03/03 01:54 PM
      memory errorsblaine2021/03/03 02:53 PM
        memory errorsanon22021/03/03 05:30 PM
          memory errorsdmcq2021/03/04 05:16 AM
            memory errorsEtienne Lorrain2021/03/04 06:26 AM
              memory errorsdmcq2021/03/04 06:40 AM
                memory errorsEtienne Lorrain2021/03/04 06:58 AM
                  memory errorsdmcq2021/03/04 07:12 AM
                  memory errorsCarson2021/03/05 02:31 AM
                    memory errorsEtienne Lorrain2021/03/05 06:23 AM
                      memory errorsrwessel2021/03/05 07:48 AM
                      memory errorsdmcq2021/03/05 12:01 PM
                        memory errorsrwessel2021/03/05 12:23 PM
                          memory errorsdmcq2021/03/05 12:51 PM
                      memory errorsBrendan2021/03/05 11:38 PM
                      memory errorsCarson2021/03/06 01:35 AM
                        memory errorsCarson2021/03/06 06:24 AM
                memory errorsDavid Hess2021/03/04 01:44 PM
                  memory errorsrwessel2021/03/04 05:14 PM
                  memory errorsLinus Torvalds2021/03/04 08:21 PM
                    memory errorsanon22021/03/04 09:46 PM
                      memory errorsCarson2021/03/05 02:43 AM
                        memory errorsanon22021/03/05 07:55 AM
                    memory errorsgallier22021/03/05 02:22 AM
                  memory errorsdmcq2021/03/05 12:59 PM
                    memory errorsDavid Hess2021/03/06 04:27 AM
                      memory errorsCarson2021/03/06 06:44 AM
                      memory errorsGabriele Svelto2021/03/06 10:11 AM
                        memory errorsDavid Hess2021/03/06 10:28 AM
                          memory errorsMichael S2021/03/06 02:45 PM
              memory errorsDoug S2021/03/04 10:48 AM
                memory errorsMichael S2021/03/04 11:36 AM
              memory errorsJörn Engel2021/03/04 03:32 PM
                memory errorsLinus Torvalds2021/03/04 08:47 PM
                  memory errorsEtienne Lorrain2021/03/05 01:09 AM
                  memory errorsMichael S2021/03/05 04:06 AM
                    memory errorsLinus Torvalds2021/03/05 11:59 AM
                      memory errorsrwessel2021/03/05 12:32 PM
                        memory errorsrwessel2021/03/05 12:37 PM
                        memory errorszArchJon2021/03/06 08:39 PM
                      memory errorsGabriele Svelto2021/03/06 12:58 PM
                  memory errorsJörn Engel2021/03/05 10:12 AM
                Amiga recoverable RAM disk?Carson2021/03/05 03:03 AM
                  Thanks - TIL a cool Amiga feature (nt) (NT)John2021/03/05 12:51 PM
                    Another cool Amiga feature, datatypesCharles2021/03/06 12:01 AM
                      Another cool Amiga feature, datatypesJukka Larja2021/03/06 01:23 AM
                      Another cool Amiga feature, datatypesAnon2021/03/06 12:40 PM
                      Another cool Amiga feature, filesystemsMarcus2021/03/07 12:28 AM
  CPU & Memory bit flipszArchJon2021/03/04 06:39 AM
    CPU & Memory bit flipsdmcq2021/03/04 06:59 AM
      CPU & Memory bit flipsrwessel2021/03/04 12:27 PM
  speak of the devilRobert Williams2021/03/05 07:53 AM
    speak of the devildmcq2021/03/05 11:26 AM
      speak of the devilRobert Williams2021/03/05 03:15 PM
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