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    SubjectRe: 2.6.21-rc1: known regressions (v2) (part 2)

    * Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:

    > Thomas Gleixner napisał(a):
    > > Adrian,
    > >
    > > On Mon, 2007-02-26 at 23:05 +0100, Adrian Bunk wrote:
    > >> Subject : kernel BUG at kernel/time/tick-sched.c:168 (CONFIG_NO_HZ)
    > >> References : http://lkml.org/lkml/2007/2/16/346
    > >> Submitter : Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
    > >> Handled-By : Thomas Gleixner <tglx@linutronix.de>
    > >> Status : problem is being debugged
    > >
    > > The BUG_ON() was replaced by a warning printk(). The BUG_ON() exposed a
    > > problem with the SMT scheduler. See below.
    > >
    > >> Subject : BUG: soft lockup detected on CPU#0
    > >> NOHZ: local_softirq_pending 20 (SMT scheduler)
    > >> References : http://lkml.org/lkml/2007/2/20/257
    > >> Submitter : Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
    > >> Handled-By : Thomas Gleixner <tglx@linutronix.de>
    > >> Ingo Molnar <mingo@elte.hu>
    > >> Status : problem is being debugged
    > >
    > > Patch available, not confirmed yet.
    > >
    >
    > I can confirm that the bug is fixed (over 20 hours of testing should
    > be enough).

    thanks alot! I think this thing was a long-term performance/latency
    regression in HT scheduling as well.

    Ingo
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