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Re: [Xen-users] Time jumping forward on HVM domU's

To: Juan Luis Baptiste <juan.baptiste@xxxxxxxxx>
Subject: Re: [Xen-users] Time jumping forward on HVM domU's
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Thu, 16 Dec 2010 20:11:40 +0200
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On Thu, Dec 16, 2010 at 09:34:28AM -0500, Juan Luis Baptiste wrote:
> Hi,
> I have noticed something with all my HVM domU's, and that is that the
> time jumps forward, in two hours after having synchronized the clock
> it will be like half hour forward. I have tried everything I have
> found on the subject, like setting localtime=1 and setting timer_mode
> = 1,2 or 3 with no success, it still jumps forward really fast. I also
> found a bug report[1] about this problem from 2007 that is still open
> with no comments from developers, which leaves me thinking if it is
> really a bug or more of a missconfiguration of HVM domU's as this
> doesn't happens with my PVM domU's.
> I'm missing any configuration to get the clock working fine on HVM
> domU's ? of course I could convert them to PVM but they are around 20
> of them so if there's some configuration I could do to them to fix
> this issue it would be a lot better.


What clocksource is your HVM guest kernel using? 

-- Pasi

> I'm running CentOS 5.5 x86_64 (for both dom0 and all domU's) with
> default Xen 3.0.3.
> [1]http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1008
> Cheers,
> -- 
> Juancho
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