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Re: [Xen-users] Time went backwards in domU after migration

To: Takeshi Sone <ts1@xxxxxxxxxx>
Subject: Re: [Xen-users] Time went backwards in domU after migration
From: John Leach <john@xxxxxxxxxxxxxxx>
Date: Sat, 29 Sep 2007 20:36:22 +0100
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I can reproduce this too - Gutsy versions of Xen 3.1.0 with the Gutsy
2.6.22 kernel on dom0 and domU.

It sometimes migrates ok for me, but mostly causes this.  The
clocksource messages continue repeatedly until the domU is rebooted. 

The clock in the domU is stalled too.

I've reported it to Ubuntu:


Feel free to add any more information there to help the kernel

http://www.brightbox.co.uk - UK Rails Xen Hosting

On Fri, 2007-09-28 at 17:01 +0900, Takeshi Sone wrote:
> Hello gurus,
> I have two physical xen hosts and when I migrate a domU from one host to 
> another, I get many of this error from domU kernel:
> clocksource/0: Time went backwards: delta=-3536123661 shadow=686019823475 
> offset=281887188
> Sometimes domU time stalls and network stops working, but other times it
> gets working again.
> The two hosts are using different platform timer source:
> root@xen1test:~# xm dmesg|grep -i timer
> (XEN) Platform timer is 14.318MHz HPET
> root@xen2:~# xm dmesg|grep -i timer
> (XEN) Platform timer is 1.193MHz PIT
> Both hosts use Ubuntu Gutsy (latest as of today) packaged version of Xen
> 3.1.0, Linux 2.6.22 (on both dom0 and domU).
> Dom0s are working flawlessly.
> Thanks in advance,
> Takeshi

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