Re: Native preemption is the culprit [was Re: today's CURRENT lockups]

From: Thorsten Greiner (thorsten_at_tgreiner.net)
Date: 07/06/04

  • Next message: Dag-Erling Smørgrav: "Re: recent libalias changes" 
    Date: Tue, 6 Jul 2004 13:19:26 +0200
To: Robert Watson <rwatson@freebsd.org>

    * Robert Watson <rwatson@freebsd.org> [2004-07-06 08:21]:
    > The patch below appears to (brute force) eliminate the crash/hang I'm
    > experiencing with SCHED_ULE in the post-preemption universe. However, I
    > was experiencing it only in the SMP case, not UP, so it could be I'm just
    > not triggering it timing-wise. This would be a temporary fix until jhb is
    > online again post-USENIX to take a look, assuming this works around the
    > problem for people other than me.

    It does work here (as did backing out the native preemption stuff).

    > Note that this is probably damaging to interrupt processing latency.

    I have not observed anything unusual with this patch. There are
    seemingly no increases of build times for my projects and I did not
    experience any interactivity glitches (no jumpy mouse or the like).

    Regards
            -Thorsten 

    -- 
Those who in quarrels interpose, must often wipe a bloody nose.
 
This message is digitally signed. To verify its integrity, download a copy
of GnuPG for your operating system from http://www.gnupg.org .

    • application/pgp-signature attachment: stored
  • Next message: Dag-Erling Smørgrav: "Re: recent libalias changes"

    Relevant Pages

    • Re: KB885250 Network Share Problems
      ... >I removed the patch and everything works as expected. ... >command by itself and no files or folders are reported. ... > Directory of Z:\2003 Resource Kit ... Only apply it to systems that are experiencing this ...
      (microsoft.public.windowsxp.network_web)
    • Re: [PATCH] mmc_spi: do propper retry managment in the block layer - rewritten
      ... [CC'ing Nicolas as he's the at91 mci driver maintainer] ... who says that they've been experiencing similar issues and that your ... I've heard from one person that an earlier version of this patch fixed ... Nicolas, do you have an opinion on the patch? ...
      (Linux-Kernel)
    • Re: Q324929 bug??
      ... I installed the cumulative patch this morning and started experiencing ... loss of session variables on an in-house application. ... > the underscores were working fine in IE6.0 before the ...
      (microsoft.public.security)
    • Re: Native preemption is the culprit [was Re: todays CURRENT lockups]
      ... M>> The patch below appears to eliminate the crash/hang I'm ... M>> experiencing with SCHED_ULE in the post-preemption universe. ...
      (freebsd-current)
    • Re: Native preemption is the culprit [was Re: todays CURRENT lockups]
      ... > The patch below appears to (brute force) eliminate the crash/hang I'm ... > was experiencing it only in the SMP case, not UP, so it could be I'm just ...
      (freebsd-current)