Re: [Xen-users] drifting clock in domUs

[Nathan Stratton <nathan@xxxxxxxxxxxx>]

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

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