Re: [patch] voluntary-preempt-2.6.9-rc2-mm4-S7

[Lee Revell]

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.

Lee

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