linux-kernel - Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2

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Date:	Sun, 11 Mar 2007 12:39:09 +0100
From:	Mike Galbraith <efault@....de>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	ck list <ck@....kolivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2

Hi Con,

On Sun, 2007-03-11 at 14:57 +1100, Con Kolivas wrote:
> What follows this email is a patch series for the latest version of the RSDL 
> cpu scheduler (ie v0.29). I have addressed all bugs that I am able to 
> reproduce in this version so if some people would be kind enough to test if 
> there are any hidden bugs or oops lurking, it would be nice to know in 
> anticipation of putting this back in -mm. Thanks.
> 
> Full patch for 2.6.21-rc3-mm2:
> http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc3-mm2-rsdl-0.29.patch

I'm seeing a cpu distribution problem running this on my P4 box.

Scenario:
listening to music collection (mp3) via Amarok.  Enable Amarok
visualization gforce, and size such that X and gforce each use ~50% cpu.
Start rip/encode of new CD with grip/lame encoder.  Lame is set to use
both cpus, at nice 5.  Once the encoders start, they receive
considerable more cpu than nice 0 X/Gforce, taking ~120% and leaving the
remaining 80% for X/Gforce and Amarok (when it updates it's ~12k entry
database) to squabble over.

With 2.6.21-rc3,  X/Gforce maintain their ~50% cpu (remain smooth), and
the encoders (100%cpu bound) get whats left when Amarok isn't eating it.

I plunked the above patch into plain 2.6.21-rc3 and retested to
eliminate other mm tree differences, and it's repeatable.  The nice 5
cpu hogs always receive considerably more that the nice 0 sleepers.

	-Mike

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