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Re: [Xen-users] drifting clock in domUs

from [Nathan Stratton]

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To:	Jonas Meurer <jonas@xxxxxxxxxxxxxxx>
Subject:	Re: [Xen-users] drifting clock in domUs
From:	Nathan Stratton <nathan@xxxxxxxxxxxx>
Date:	Sun, 11 Jan 2009 12:54:13 -0600 (CST)
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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 secondis a big deal to us. It's a hack, but the only way we have been able toget 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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