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SubjectRe: scheduler starvation resistance patches for 2.6.16
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On Tue, 2006-03-28 at 07:10 +0200, Mike Galbraith wrote:
> On Mon, 2006-03-27 at 21:36 +0300, Al Boldi wrote:
> > It's not bad. w/ credit_c1/2 set to 0 results in an improvement in running
> > the MESA demos "# gears & reflect & morph3d" .
>
> Hmm. That's unexpected.
>
> > But a simple "# while :; do :; done &" (10x) makes a "# ping 10.1 -A -s8"
> > choke.
>
> Ouch, so is that. But thanks, testcases are great. I'll look into it.

OK, this has nothing to do with my patches. The same slowdown happens
with a stock kernel when running a few pure cpu hogs. I suspect it has
to do with softirqd, but am still investigating.

-Mike

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