Re: [Xen-devel] [BUG 2.6.32.y] Broken PV migration between hosts with different uptime, non-monotonic time?

[Philipp Hahn <hahn@xxxxxxxxxxxxx>]

Hello David,

On Friday 04 May 2012 12:39:03 David Vrabel wrote:
> On 04/05/12 09:54, Philipp Hahn wrote:
> > I encountered the following bug when migrating a Linux-2.6.32.54 PV
> > domain on Xen-3.4.3 between different hosts, whose uptime differs by
> > several minutes
... 
> Xen 3.4 doesn't ensure that the TSC is stable across migrates (Xen 4.0
> does).  If the host CPU has the CONSTANT_TSC bit in the Advanced Power
> Management CPUID leaf it will pass this through to the guest which makes
> the guest think the TSC is stable.
>
> Can you try this libxc patch?
>
> 8<------------------------
> libxc: clear CONSTANT_TSC bit in Advanced Power Management CPUID leaf

Excellent, that fixes the problem for me and makes perfect sense for me, since 
AFAIK 2.6.37 also received a big TSC patch which is not part of 2.6.32.y 
backport.
Thank your for your help.

Sincerely
Philipp Hahn
-- 
Philipp Hahn           Open Source Software Engineer      hahn@xxxxxxxxxxxxx
Univention GmbH        be open.                       fon: +49 421 22 232- 0
Mary-Somerville-Str.1  D-28359 Bremen                 fax: +49 421 22 232-99
                                                   http://www.univention.de/

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