Re: [Xen-users] time synchronization problem (using NTP)

[Thomas Harold <tgh@xxxxxxxxxxxx>]

Ulrich Windl wrote:
> Hi,
>
> using SLES10 I'm unable to synchronize the time of DomU with that of Dom0. There 
> is a persistent offset of about 3 seconds!
(laughs) I just happen to be working on this myself.  All of my DomUs 
are about 15 seconds fast compared to the Dom0 and I've been searching 
the archives to figure out why this happens.
-------------------------------------------

According to the wiki:

http://wiki.xensource.com/xenwiki/InstallationNotes

xenU services

The following services are not needed anymore:

* ntpd

the xenU uses the dom0 time

If you want to run ntp in the domU, try: echo 1 > 
/proc/sys/xen/independent_wallclock
-------------------------------------------

But if I look through news.gmane.org's archive of xen-users 
(gmane.comp.emulators.xen.user), there's conflicting advice given back 
in April 2006 (and Nov 2005... and May 2005).
One camp says that we should run ntpd in Dom0, leave 
independent_wallclock set to zero and the DomUs should take their time 
from Dom0 and stay in sync.
The other camp says that we should set independent_wallclock to 1 and 
run ntpd within the DomUs.
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