linux-kernel - Re: Regression in latest sched-git

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Date:	Wed, 13 Feb 2008 17:43:13 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	vatsa@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Regression in latest sched-git


On Wed, 2008-02-13 at 22:07 +0530, Dhaval Giani wrote:
> On Wed, Feb 13, 2008 at 10:04:44PM +0530, Dhaval Giani wrote:
> > > > On the same lines, I cant understand how we can be seeing 700ms latency
> > > > (below) unless we had: large number of active groups/users and large number of 
> > > > tasks within each group/user.
> > > 
> > > All I can say it that its trivial to reproduce these horrid latencies.
> > > 
> > 
> > Hi Peter,
> > 
> > I've been trying to reproduce the latencies, and the worst I have
> > managed only 80ms. At an average I am getting around 60 ms. This is with
> > a make -j4 as root, and dhaval running other programs. (with maxcpus=1).
> > 
> 
> Totally missed here. Any more hints to reproduce?

Not really, this is the recipie I took from Lukas Hejtmanek's report and
it worked for me.

I'll see if I can find some time to try the ftrace patches to narrow
this down.

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