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

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Message-Id: <1238098977.5406.5.camel@kulgan>
Date:	Fri, 27 Mar 2009 06:52:57 +1030
From:	Kevin Shanahan <kmshanah@...b.org.au>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Avi Kivity <avi@...hat.com>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)

On Tue, 2009-03-24 at 12:44 +0100, Frederic Weisbecker wrote:
> As I explained in my previous mail, you trace is only
> a snapshot that happened in 10 msec.
> 
> I experimented different sizes for the ring buffer but even
> a 1 second trace require 20 Mo of memory. And a so huge trace
> would be impractical.
> 
> I think we should keep the trace filters we had previously.
> If you don't minde, could you please retest against latest -tip
> the following updated patch? Iadded the filters, fixed the python
> subshell and also flushed the buffer more nicely according to
> a recent feature in -tip:
> 
> echo > trace 
> 
> instead of switching to nop.
> You will need to pull latest -tip again.

Ok, new set of traces uploaded again here:

  http://disenchant.net/tmp/bug-12465/trace-4/

These were taken using 2.6.29-tip-02749-g398bf09.

Same as last time, it was only necessary to have the one guest running
to reproduce the problem.

Cheers,
Kevin.


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