linux-kernel - Re: Network slowdown due to CFS

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Message-ID: <20070926094726.GA27006@elte.hu>
Date:	Wed, 26 Sep 2007 11:47:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Martin Michlmayr <tbm@...ius.com>
Cc:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Network slowdown due to CFS


* Ingo Molnar <mingo@...e.hu> wrote:

> > What kind of information can I supply so you can track this down?
> 
> as a starter, could you boot the sched-devel.git kernel, with 
> CONFIG_SCHED_DEBUG=y and CONFIG_SCHEDSTATS=y enabled and could you run 
> this script while the iperf test is in the middle of its testrun:
> 
>   http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info.sh
> 
> this will gather a good deal of info about the workload in question. 
> Please send me the resulting debug file.

Another thing: please also do the same with the vanilla v2.6.22 kernel, 
and send me that file too. (so that the two cases can be compared)

	Ingo
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