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

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Message-Id: <200703142026.05016.kernel@kolivas.org>
Date:	Wed, 14 Mar 2007 20:25:58 +1100
From:	Con Kolivas <kernel@...ivas.org>
To:	Mike Galbraith <efault@....de>
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 Wednesday 14 March 2007 20:13, Mike Galbraith wrote:
> 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.

No don't. It's buggy and you missed the warning. Boy were you lucky I was 
looking right now.

-- 
-ck
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