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SubjectRe: [patch] voluntary-preempt-2.6.9-rc2-mm4-S7
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On Sat, 2004-10-02 at 22:14, Lee Revell wrote:
> On Sat, 2004-10-02 at 22:01, Lee Revell wrote:
> > On Mon, 2004-09-27 at 20:05, Ingo Molnar wrote:
> > > i've released the -S7 VP patch:
> > >
> > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc2-mm4-S7
> > >
> >
> > I believe we have found a bug. A user reported massive xruns with S7,
> > they turned out to be printk() overhead from tons of "using
> > smp_processor_id() in preemptible code" errors. The trace below repeats
> > over and over. Looks like raid0 is the problem.
>
> The exact configuration is 4 SCSI drives in a raid 0, and a single IDE
> drive. The raid0 code apparently is not preempt safe.

s/preempt safe/preempt+SMP safe/. System is a dual PIII-600.

Lee

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