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From: James Thomason <james@divide.org>
To: Avi Kivity <avi@redhat.com>
Cc: <kvm@vger.kernel.org>
Subject: Re: Guest Hang Bugs
Date: Thu, 15 Jan 2009 14:49:30 -0800	[thread overview]
Message-ID: <C594FD7A.6251%james@divide.org> (raw)
In-Reply-To: <496F55EB.6040506@redhat.com>


On 1/15/09 7:27 AM, "Avi Kivity" <avi@redhat.com> wrote:
 
> Cam you try adding clocksource=acpi_pm to the _guest_ kernel command line?

Avi, 

I booted the guest with clocksource=acpi_pm and it has been running under
heavy load for about 4 hours with kvm -smp 12.  Considering that the guest
previously would not even boot with kvm -smp 12, I think this is the root
cause.  As another data point, I was not able to trigger the bug when
running a guest with all active cores on socket 0 only, but I was able to
trigger it when putting half the cores on socket 1.  So in a nutshell the
kernel uses an unreliable clock source by default on SMP systems?

Thanks for your help!

Regards, 
James






  reply	other threads:[~2009-01-15 22:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-14 19:17 Guest Hang Bugs James Thomason
2009-01-15 15:27 ` Avi Kivity
2009-01-15 22:49   ` James Thomason [this message]
2009-01-16  1:26     ` James Thomason
2009-01-18  9:15       ` Avi Kivity

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