linux-kernel - Re: RSDL v0.31

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Message-Id: <1174084207.7009.9.camel@Homer.simpson.net>
Date:	Fri, 16 Mar 2007 23:30:07 +0100
From:	Mike Galbraith <efault@....de>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	ck@....kolivas.org, Ingo Molnar <mingo@...e.hu>,
	Al Boldi <a1426z@...ab.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: RSDL v0.31

On Sat, 2007-03-17 at 08:13 +1100, Con Kolivas wrote:
> On Saturday 17 March 2007 02:34, Mike Galbraith wrote:
> > On Sat, 2007-03-17 at 00:40 +1100, Con Kolivas wrote:
> > > Here are full patches for rsdl 0.31 for various base kernels. A full
> > > announce with a fresh -mm series will follow...
> > >
> > > http://ck.kolivas.org/patches/staircase-deadline/2.6.20.3-rsdl-0.31.patch
> > > http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc3-sched-rsdl-0.
> > >31.patch
> > > http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc3-mm2-rsdl-0.31
> > >.patch
> >
> > It still has trouble with the x/gforce vs two niced encoders scenario.
> > The previously reported choppiness is still present.
> >
> > I suspect that x/gforce landing in the expired array is the trouble, and
> > that this will never be smooth without some kind of exemption.  I added
> > some targeted unfairness to .30, and it didn't help much at all.
> >
> > Priorities going all the way to 1 were a surprise.
> 
> It wasn't going to change that case without renicing X.

Con.  You are trying to wedge a fair scheduler into an environment where
totally fair simply can not possibly function.

If this is your final answer to the problem space, I am done testing,
and as far as _I_ am concerned, your scheduler is an utter failure.

	-Mike

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