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Subject: Re: [git] CFS-devel, group scheduler, fixes
From: Mike Galbraith <efault@gmx.de>
To: Tong Li <tong.n.li@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>, dimm <dmitry.adamushko@gmail.com>,
       linux-kernel@vger.kernel.org,
       Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>
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Date: Wed, 19 Sep 2007 10:42:48 +0200
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On Wed, 2007-09-19 at 09:51 +0200, Mike Galbraith wrote:

> The scenario which was previously cured was this:
> taskset -c 1 nice -n 0 ./massive_intr 2 9999
> taskset -c 1 nice -n 5 ./massive_intr 2 9999
> click link
> (http://pages.cs.wisc.edu/~shubu/talks/cachescrub-prdc2004.ppt) to bring
> up browser and OpenOffice Impress.
> 
> Xorg (at nice -5 + above scenario) latency samples:
> se.wait_max              :            57985337
> se.wait_max              :            25163510
> se.wait_max              :            37005538
> se.wait_max              :            66986511
> se.wait_max              :            53990868
> se.wait_max              :            80976761
> se.wait_max              :            96967501
> se.wait_max              :            80989254
> se.wait_max              :            53990897
> se.wait_max              :           181963905
> se.wait_max              :            85985181

To be doubly sure of the effect on the pinned tasks + migrating Xorg
scenario, I just ran the above test 10 times with virgin devel source.
Maximum Xorg latency was 20ms.

	-Mike

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