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Subject: Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with
	differential nice
From: Mike Galbraith <efault@gmx.de>
To: Con Kolivas <kernel@kolivas.org>
Cc: Al Boldi <a1426z@gawab.com>, Andrew Morton <akpm@linux-foundation.org>,
       Ingo Molnar <mingo@elte.hu>, ck list <ck@vds.kolivas.org>,
       linux-kernel@vger.kernel.org
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Date: Wed, 14 Mar 2007 10:13:35 +0100
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On Wed, 2007-03-14 at 02:31 +1100, Con Kolivas wrote:

> Can you try the attached patch please Al and Mike? It "dithers" the priority
> bitmap which tends to fluctuate the latency a lot more but in a cyclical
> fashion. This tends to make the max latency bound to a smaller value and
> should make it possible to run -nice tasks without killing the latency of the
> non niced tasks. Eg you could possibly run X nice -10 at a guess like we used
> to in 2.4 days. It's not essential of course, but is a workaround for Mike's
> testcase.
> 

Oh my.  I thought I was all done staring mindlessly at gforce (chinese
water torture).  Oh well, a few more brain cells dying of boredom won't
kill me I guess ;-)  Will give it a shot.

	-Mike