Re: 2.5.74-mm1 and Con Kolivas' CPU scheduler work

From: Con Kolivas (
Date: Thu Jul 03 2003 - 23:25:29 EST

On Fri, 4 Jul 2003 14:11, Tom Sightler wrote:
> On Thu, 2003-07-03 at 22:29, Con Kolivas wrote:
> > Ah yes I believe I know this issue. The problem is the parent spinning
> > madly waiting for the child and it is the parent that starves the child.
> > While this is not a fix, if you can reproduce the problem can you try
> > changing CHILD_PENALTY in kernel/sched.c from 50 to 100 and see if that
> > makes the problem go away? I mentioned this hidden in a thread a while
> > ago, and am trying to get a reasonable fix.
> Well, perhaps I spoke too soon about this particular issues. I have
> just compiled 2.5.74-mm1 and it seems to be much better behaved that my
> previous kernel (2.5.72-mm2). I can no longer reproduce the issue with
> this new kernel but the problem is easily reproducible with my older
> kernel. Does 2.5.74-mm1 have a recent version of your patches (I know
> it has some variation of your patches but you've been cracking them out
> pretty quick lately). I've run testing with my horror cases of
> Crossover Plugin and multiple Crossover Office applications running
> simultaneously and all programs seem responsive, these cases caused all
> kinds of audio skipping and pauses on the system before.
> I'm still running some other tests that seem to be showing some
> strangeness but I need to do some more test on both kernels before I
> really reports them.
> Thanks for your hard work on these issues, for my workload things seem
> to be getting quite a bit better.

Heh well that's nice. The last patch posted on my site ( ) is the same as in -mm1. There is no newer patch yet,
but I've got some changes coming to apply on top pretty soon. Hopefully these
will address your "strangeness". :)


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