linux-kernel - Re: [git pull] scheduler fixes

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Message-ID: <4972F487.2040002@redhat.com>
Date:	Sun, 18 Jan 2009 11:21:11 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Mike Galbraith <efault@....de>,
	Kevin Shanahan <kmshanah@...b.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	a.p.zijlstra@...llo.nl, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [git pull] scheduler fixes

Avi Kivity wrote:
> Ingo Molnar wrote:
>> Can you reproduce those latencies? We didnt get similar reports from 
>> elsewhere so there seems to be a KVM angle.
>>   
>
> A simple test running 10 idle guests over 4 cores doesn't reproduce 
> (2.6.29-rc).  However we likely need a more complicated setup.
>
> Kevin, any details about your setup?  What are the guests doing?  Are 
> you overcommitting memory (is the host swapping)?
>

If the host load is low enough, it may be worthwhile to repeat with 
-no-kvm.  It's significantly different from kvm (much higher cpu load, 
and less tasks involved), but if the problem recurs, we know it's a pure 
sched issue.

-- 
error compiling committee.c: too many arguments to function

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