Subject: Re: scheduler starvation resistance patches for 2.6.16
From: Mike Galbraith <efault@gmx.de>
To: Al Boldi <a1426z@gawab.com>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <1143522632.7441.16.camel@homer>
References: <200603272136.07908.a1426z@gawab.com>
	 <1143522632.7441.16.camel@homer>
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Date: Tue, 28 Mar 2006 11:12:00 +0200
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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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