linux-kernel - Re: [git] CFS-devel, latest code

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Message-Id: <1190709207.11226.6.camel@Homer.simpson.net>
Date:	Tue, 25 Sep 2007 10:33:27 +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>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [git] CFS-devel, latest code

On Tue, 2007-09-25 at 09:35 +0200, Mike Galbraith wrote:

> Darn, have news: latency thing isn't dead.  Two busy loops, one at nice
> 0 pinned to CPU0, and one at nice 19 pinned to CPU1 produced the
> latencies below for nice -5 Xorg.  Didn't kill the box though.
> 
> se.wait_max              :            10.068169
> se.wait_max              :             7.465334
> se.wait_max              :           135.501816
> se.wait_max              :             0.884483
> se.wait_max              :           144.218955
> se.wait_max              :           128.578376
> se.wait_max              :            93.975768
> se.wait_max              :             4.965965
> se.wait_max              :           113.655533
> se.wait_max              :             4.301075
> 
> sched_debug (attached) is.. strange.

Disabling CONFIG_FAIR_GROUP_SCHED fixed both.  Latencies of up to 336ms
hit me during the recompile (make -j3), with nothing else running.
Since reboot, latencies are, so far, very very nice.  I'm leaving it
disabled for now.

	-Mike 

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