linux-kernel - Re: [announce] CFS-devel, performance improvements

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Date:	Wed, 12 Sep 2007 08:20:21 +0200
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [announce] CFS-devel, performance improvements

On Tue, 2007-09-11 at 22:04 +0200, Ingo Molnar wrote:
> fresh back from the Kernel Summit, Peter Zijlstra and me are pleased to 
> announce the latest iteration of the CFS scheduler development tree. Our 
> main focus has been on simplifications and performance - and as part of 
> that we've also picked up some ideas from Roman Zippel's 'Really Fair 
> Scheduler' patch as well and integrated them into CFS. We'd like to ask 
> people go give these patches a good workout, especially with an eye on 
> any interactivity regressions.

Initial test-drive looks good here, but I do see a regression.  First
the good news.

fairtest2 is perfect, more perfect than ever seen before in fact.  Mixed
interval sleepers/hog looks fine as well (can't say perfect due to
startup differences with the various proggies, but cpu% looks perfect).
Amarok song switch time under hefty kbuild load is fine as well.  I
haven't done heavy multimedia testing yet, but will give it a more
thorough workout later (errands).

The regression:  I see some GUI lurch, easily reproducible by running a
make -j5 and moving the mouse in a circle... perceptible (100ms or so)
lurches not present in rc5. 

	-Mike

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