linux-kernel - Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with differential nice

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Message-Id: <1173863615.7822.86.camel@Homer.simpson.net>
Date:	Wed, 14 Mar 2007 10:13:35 +0100
From:	Mike Galbraith <efault@....de>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	Al Boldi <a1426z@...ab.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, ck list <ck@....kolivas.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with
	differential nice

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

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