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

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Message-ID: <20070925085329.GJ26289@linux.vnet.ibm.com>
Date:	Tue, 25 Sep 2007 14:23:29 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Mike Galbraith <efault@....de>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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, Sep 25, 2007 at 10:33:27AM +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.

Mike,
	Do you have FAIR_USER_SCHED turned on as well? Can you send me
your .config pls?

Also how do you check se.wait_max?

> 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.

-- 
Regards,
vatsa
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