[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [Xen-users] Xen time drift issues

  • To: "'Priya'" <pbhat@xxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Tanuj Bansal" <bansal.tanuj83@xxxxxxxxx>
  • Date: Wed, 8 Jul 2009 17:29:16 +0530
  • Cc:
  • Delivery-date: Wed, 08 Jul 2009 05:00:31 -0700
  • Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=reply-to:from:to:references:in-reply-to:subject:date:message-id :mime-version:content-type:content-transfer-encoding:x-mailer :thread-index:content-language; b=VgNVYr8Ibsgb/4glPG5wSwdsjhRGR974mlmjwNI8CrA9XsUypIoFbLohYWGNdKjIdP d6JUL3dtzURSlGhZNhJetsmOl6XfV9lk9xn+OW73K+IHaSbBdt7qPxdeigC239yLY5rf uI1L3o8ngANn85AOkdNlPkwdQsO4eYiOPEmjk=
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: Acn+R9qT3l8iDuFqScOfX+zG1MMb9ABe3rKg

Hi Priya:

If you are using NTP, then shutdown the NTP service on all DomU and restart
it on Dom0 only.


Tanuj Bansal

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Priya
Sent: Wednesday, July 01, 2009 8:55 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Xen time drift issues

Hello everyone!

I been observing some peculiar time drift on my Xen domains (dom0 and
domUs).  The time (as returned by timeofday) on my domains drifts at
an almost steady rate from the real time ( as read from the time stamp
counter ).

The drift is so constant that it makes me think there should be some
simple explanation for it in the way Xen keeps time.

Some info about my set up:
guest OS: ubuntu
independent_wallclock is set to default 0 on all domains
no NTP synchronization

The drift is around 50 microseconds / second on all the domains. Has
anyone else observed this? If anyone can point me to some
documentation that explains this behavior, that would be great!

Good day!

Xen-users mailing list

Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.