linux-kernel - Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with differential nice -1

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Date:	Wed, 14 Mar 2007 03:08:39 +1100
From:	Con Kolivas <kernel@...ivas.org>
To:	ck@....kolivas.org
Cc:	Al Boldi <a1426z@...ab.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with  differential nice -1

On Wednesday 14 March 2007 03:03, Con Kolivas wrote:
> On Wednesday 14 March 2007 02:31, Con Kolivas wrote:
> > On Monday 12 March 2007 22:26, Al Boldi wrote:
> > > I think, it should be possible to spread this max expiration latency
> > > across the rotation, should it not?
> >
> > 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.
>
> Oops, one tiny fix. This is a respin of the patch, sorry.

A few other minor things would need to be updated before this patch is in a 
good enough shape to join the rsdl patches. This one will be good for testing 
though.

-- 
-ck
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