memory errors

By: anon2 (anon.delete@this.anon.com), March 4, 2021 9:46 pm
Room: Moderated Discussions
Linus Torvalds (torvalds.delete@this.linux-foundation.org) on March 4, 2021 8:21 pm wrote:
> David Hess (davidwhess.delete@this.gmail.com) on March 4, 2021 1:44 pm wrote:
> >
> > I have not noticed any delay on my workstation which has 64G.
>
> The people who were hurting are the people with many hundreds of gigs (or terabytes)
> of RAM, and have five-nines availability guarantees, and want their scheduled
> maintenance reboots to take on the order of seconds, not minutes.
>
> Yes, yes, they obviously actually use many other strategies (ie multiple nodes with fail-over etc) because
> generally there's no way they'll hit the reboot speed requirements even for scheduled downtime, much less
> for when something actually goes wrong. But they do tend to want "fail fast, and get back up fast".
>
> People like that absolutely hated the traditional SCSI disk spin-up times, and they found fsck times
> completely unacceptable, and they want the RAM to be scrubbed and initialized incrementally so that you
> can boot and get the system up and the loads started ASAP. Keep scrubbing and initializing more RAM in
> parallel, because it's going to take a while before you're under full load and need it all anyway.
>
> Those people tend to be a fairly special breed.
>
> There's very much the other kind of server person, who is used to (and so resigned as to expect) the server
> reboot taking possibly tens of minutes, because that's just what they always did - spinning up one rotating
> platter of rust at a time to avoid the power surge of spinning them all up at the same time etc etc.
>
> I'm not even kidding. That whole "spin up one disk at a time" is
> not some exaggeration. It was standard practice in many places.
>
> Of course, it's largely historical, and had real roots - those disks used to be massive, and spinning
> them up really was a big deal. It's just that the practice of spinning disks up one at a time actually
> went on in many places long after those physically massive disk systems were long long gone.
>
> So you have this odd dichotomy of boot speed expectations in the big iron world. Some want it
> to be really instant and quick. And some are perfectly happy with ridiculously slow boots.
>
> I've had access to big powerful hardware that was almost entirely useless for kernel development, because
> while they could compile a new kernel really quickly, they then took literally several minutes to boot
> the damn thing. So a much slower machine was actually much better at doing any actual testing on.

You still don't use virtual machines for testing?
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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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