Xen users - Oct 2011 - time on xen guests goes fast

Dear All,

I have centos 5.5 Xen using kernel 2.6.18-194.el5xen and xen 3.0.3 .
I have 3 xen guest one centos 5.5 and one windows 2008 and one 2003

everything is working perfect but i have seen that the centos guest machine  
has time running fast .after about a hr or more I see there is a shift in  
time about 2 to 3 minutes and keeps increasing

but there is no problem with the 2 windows machines

I tried to set the time disabled UTC as false but problem pesists

I also tried to install ntp but the problem still there

I been googling around but no much avail


really would appreciate if someone out there could help me out

Thanks and regards

benedict


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Try this on dom0 _AND_ in your Linux domU:

# echo ''0'' > /proc/sys/xen/independent_wallclock

-- 

Diego Augusto Molina
diegoaugustomolina@gmail.com

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Answer to the list, please! You may help others.

2011/10/28, benedict dcunha
<sylvan.dcunha@gmail.com>:
> Dear Diego,
>
> thanks a lot for the immediate response.
> I do apprecite
> actually googling arrount I found as you mentiond and i did run it on my
dom
> 0 but my linux xen guest does not have
> independent_wallclock file
Mmm... That''s weird. Check if your guest is configured as HVM instead
of PV. Try configuring it as PV.
If that doesn''t help then... mmm... try upgrading xen from 3.0.3 to
something like 3.4x. In my experience I have always used that version.
Also, could you post the whole config file for that particular domU
(if at all possible)?
> I also setup ntp but the system has a private IP  so it wont be able to
> contact public ntp servers
>
> so I plan to have one of my other server which has a public ip as a ntp
> server
Generally speaking, NTP is a basic service that should be in all
networks. The basic idea here would be to synchronize your dom0 and
all Linux PV domU''s will read the same time (from dom0) so you
don''t
need to worry about NTP in the domU''s. But yours is a valid option
too: note that Windows guests (always HVM) will have to use time sync
because they can''t read dom0''s clock so it''s not
embarrassing to use
NTP in your Linux box; it''s more like an advantage not taken.

-- 
Diego Augusto Molina
diegoaugustomolina@gmail.com

ES: Por favor, evite adjuntar documentos de Microsoft Office. Serán
desestimados.
EN: Please, avoid attaching Microsoft Office documents. They shall be discarded.
LINK: http://www.gnu.org/philosophy/no-word-attachments.html

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