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

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Date:	Tue, 25 Sep 2007 14:54:53 +0200
From:	Mike Galbraith <efault@....de>
To:	vatsa@...ux.vnet.ibm.com
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, 2007-09-25 at 14:28 +0200, Mike Galbraith wrote:
> On Tue, 2007-09-25 at 15:58 +0530, Srivatsa Vaddagiri wrote:
> 
> > While I try recreating this myself, I wonder if this patch helps?
> 
> It didn't here, nor did tweaking root's share.  Booting with maxcpus=1,
> I was unable to produce large latencies, but didn't try very many
> things.

Easy way to make it pretty bad: pin a nice 0 loop to CPU0, pin a nice 19
loop to CPU1, then start an unpinned make.. more Xorg bouncing back and
forth I suppose.

se.wait_max              :            14.105683
se.wait_max              :           316.943787
se.wait_max              :           692.884324
se.wait_max              :            38.165534
se.wait_max              :           732.883492
se.wait_max              :           127.059784
se.wait_max              :            63.403549
se.wait_max              :           372.933284

	-Mike

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