Re: [Xen-users] drifting clock in domUs

["Randy McAnally" <rsm@xxxxxxxxxxxxx>]

I was able to get rid of much of the drift by reducing the kernel freqency to 
100 Hz

In centos5 you can use the kernel option divider=10

In other distros you either can't do it without recompiling or there is a 
different kernel switch.

--
Randy
www.FastServ.com

---------- Original Message -----------
From: Nathan Stratton <nathan@xxxxxxxxxxxx>
To: Jonas Meurer <jonas@xxxxxxxxxxxxxxx>
Cc: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Sun, 11 Jan 2009 12:54:13 -0600 (CST)
Subject: Re: [Xen-users] drifting clock in domUs

> On Sun, 11 Jan 2009, Jonas Meurer wrote:
> 
> > Hello,
> >
> > On a xenserver with several (39) domUs, we experience problems with the
> > system clock of the domUs. The clock seems to drift away several seconds
> > up to two minutes from the dom0 clock.
> >
> > We do have set independent_wallclock=0. According to the docs (i.e.
> > http://wiki.xensource.com/xenwiki/InstallationNotes) that way domUs
> > should use the dom0 clock, but apparently that's not the case.
> 
> We run our own video applications on xen, so a drift on less then a 
> second is a big deal to us. It's a hack, but the only way we have 
> been able to get stable time is to set wallclock=1 and then run 
> chrony on them. http://chrony.sunsite.dk/
> 
> We still have drift, but it now is only -.02 - .03 ms over 1 sec.
> 
> ><>
> Nathan Stratton                                CTO, BlinkMind, Inc.
> nathan at robotics.net                         nathan at 
> blinkmind.com http://www.robotics.net                        
http://www.blinkmind.com
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
------- End of Original Message -------


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