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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: vatsa@linux.vnet.ibm.com, Ingo Molnar <mingo@elte.hu>,
	lkml <linux-kernel@vger.kernel.org>
Subject: Re: Regression in latest sched-git
Date: Wed, 13 Feb 2008 17:43:13 +0100	[thread overview]
Message-ID: <1202920993.6811.13.camel@twins> (raw)
In-Reply-To: <20080213163715.GB19570@linux.vnet.ibm.com>


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.


  reply	other threads:[~2008-02-13 16:43 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-12 18:53 Dhaval Giani
2008-02-12 19:40 ` Peter Zijlstra
2008-02-13  3:00   ` Srivatsa Vaddagiri
2008-02-13 12:51     ` Peter Zijlstra
2008-02-13 16:34       ` Dhaval Giani
2008-02-13 16:37         ` Dhaval Giani
2008-02-13 16:43           ` Peter Zijlstra [this message]
2008-02-13 17:06         ` Srivatsa Vaddagiri
2008-02-14 11:20 ` Peter Zijlstra

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