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

from [Takeshi Sone]

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Subject:	Re: [Xen-users] Time went backwards in domU after migration
From:	Takeshi Sone <ts1@xxxxxxxxxx>
Date:	Fri, 28 Sep 2007 17:43:22 +0900
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I changed the BIOS setting so both hosts use 1.193MHz PIT,

but it didn't get fixed.

Takeshi Sone wrote:

Hello gurus,

I have two physical xen hosts and when I migrate a domU from one host toanother, 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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