On Tue, 2007-07-31 at 13:48 +0200, Sébastien Dugué wrote:
> On Mon, 30 Jul 2007 14:50:34 -0700 Josh Triplett <[email protected]> wrote:
> > On Tue, 2007-07-24 at 15:42 +0200, Sébastien Dugué wrote:
> > > this one-liner fixes a bug in balance_rt_tasks() which sometimes manifests by
> > > having a lower prio task being scheduled while a higher prio task is sitting
> > > waiting on another runqueue.
> > >
> > > This is pretty hard to reproduce on low cpu count machines, for example, I
> > > had to have sched_football run in a loop for ~38h before it failed on a dual HT
> > > Xeon box.
> >
> > Very impressive find, and this does seem to improve things in some
> > cases.
> >
> > However, with 2.6.22.1-rt8, which includes this patch, I still managed
> > to get some failures after a few hours on an 8-way (quad dual-core) box.
> > Preliminary results so far:
> > 420 Final ball position: 0
> > 2 Final ball position: 1
> >
>
> Darn, I thought it was it :(
>
> I had a ~60h run on my box with the very same kernel without a single
> failure.
I think you really need a box with more processors to reproduce these
problems in a reasonable timeframe. Happy to test any patches you have
to fix RT balancing; please let me know.
> Do you have any other user RT load running when those failures pop up?
Other than sched_football, I had sshd, bash, and GNU screen,
theoretically all 100% idle (no input to read and no output to display).
- Josh Triplett
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