Re: [Xen-users] Clock problems on Squeeze/Xen4 (clock jumps 50 minutes ahead)

[Steven Timm <timm@xxxxxxxx>]

Are you running 32-bit domU's or 64-bit? I have seen the problem many 
times under xen 3.1.2 but only with 32-bit guests on 64-bit hosts.
Steve timm



On Mon, 27 Aug 2012, Aleix Dorca Josa wrote:

> Hi all,
>
> My xen farm is plagued with this 'Jump 50 minutes ahead' problem. All my 
> machines run Debian Squeeze and Xen 4 in Dom0. DomU's are Squeeze too. I 
> thought this was a hardware problem but then I saw this (kind of old) messages:
>
> http://lists.xen.org/archives/html/xen-users/2011-02/msg00609.html
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=599161
>
> After reading all available info I still don't know if the bug has been 
> resolved in later builds of either the kernel or xen on Squeeze. Has anyone got 
> new information on this?
>
> I see that the clocksource=pit on the grub command line does not seem to fix 
> the problem. Any other hints? Change to Ubuntu server? Build my own xen binary? 
> Use Debian's backports to change the kernel version?
>
> This is kind of a big problem for me since the error kills ntpd on DomU's and 
> then Dovecot's processes stop themselves when time is corrected. Scripts to 
> workaround this are fine but I would rather much prefer for the clock not to 
> jump ahead.
>
> Thanks a lot,
>
> Aleix.
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> http://lists.xen.org/xen-users
------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525
timm@xxxxxxxx  http://home.fnal.gov/~timm/
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Group Leader.
Lead of FermiCloud project.

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