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    SubjectRe: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected)
    Date
    On Sunday, 27 of January 2008, Ingo Molnar wrote:
    >
    > * Rafael J. Wysocki <rjw@sisk.pl> wrote:
    >
    > > Hi,
    > >
    > > 2.6.24-git3 adds a 5 - 10 sec delay to the suspend and hibernation
    > > code paths (probably related to the disabling of nonboot CPUs), which
    > > is !@#$%^&*() annoying.
    > >
    > > It's 100% reproducible on my HP nx6325 and bisection idendified the
    > > following commit as the first bad one:
    > >
    > > commit 764a9d6fe4b52995c8aba277e3634385699354f4
    > > Author: Steven Rostedt <srostedt@redhat.com>
    > > Date: Fri Jan 25 21:08:04 2008 +0100
    > >
    > > sched: track highest prio task queued
    >
    > hm, this patch is a NOP, so it's weird that it has an effect.
    >
    > Do you have serial logging enabled perhaps? If the following WARN_ON()
    > triggers:
    >
    > + WARN_ON(p->prio < rq->rt.highest_prio);
    >
    > then perhaps that can cause a 5-10 seconds delay. (that's how much time
    > it takes to printk a warning on the slowest serial settings)
    >
    > but if you use suspend, then any such printks would be preserved in the
    > dmesg, right? If the WARN_ON() triggers, and if you remove it, do things
    > get faster?

    No, this isn't the WARN_ON().

    > this does have the feel of being scheduling related, but are you
    > absolutely sure about the precise identity of the patch?

    Actually, not quite. That's why I have verified it and found that another
    patch is really responsible for the issue, namely:

    commit 82a1fcb90287052aabfa235e7ffc693ea003fe69
    Author: Ingo Molnar <mingo@elte.hu>
    Date: Fri Jan 25 21:08:02 2008 +0100

    softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks

    Reverting this commit (it reverts with some minor modifications) fixes the
    problem for me.

    Thanks,
    Rafael


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