linux-kernel - Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)

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Message-ID: <49773848.4080409@redhat.com>
Date:	Wed, 21 Jan 2009 16:59:20 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Kevin Shanahan <kmshanah@...b.org.au>
CC:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)

Kevin Shanahan wrote:
>>> --- hermes-old.wumi.org.au ping statistics ---
>>> 900 packets transmitted, 900 received, 0% packet loss, time 899326ms
>>> rtt min/avg/max/mdev = 0.093/0.157/3.611/0.117 ms
>>>
>>> So, a _huge_ difference. But what does it mean?
>>>       
>> It means, a scheduling problem.  Can you run the latency tracer (which 
>> only works with realtime priority), so we can tell if it is (a) kvm 
>> failing to wake up the vcpu properly or (b) the scheduler delaying the 
>> vcpu from running.
>>     
>
> Sorry, but are you sure that's going to be useful?
>
> If it only works on realtime threads and I'm not seeing the problem when
> running kvm with realtime priority, is this going to tell you what you
> want to know?
>
> Not trying to be difficult, but that just didn't make sense to me.
>   

You're right, wasn't thinking properly.

This is a tough one.  I'll see if I can think of something.  Ingo, any 
ideas?

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

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