[Xen-users] domUs Clock synchronisation

To:	xen-users@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-users] domUs Clock synchronisation
From:	"Fabrizio Buratta" <extremoburo@xxxxxxxxx>
Date:	Wed, 19 Nov 2008 17:37:53 +0100
Delivery-date:	Wed, 19 Nov 2008 08:38:30 -0800
Dkim-signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type:content-transfer-encoding :content-disposition; bh=yoGZT4tXPbLG+FqZEUfi0gXG3mvrCHBGKppgDIKmf6Y=; b=nxE6m+rVtRFFLP0qjX9mzL3mM23xyRwKfipOWkiCL4xT3mL3WintlWhH1+s6T9e0+D 53P0OWDBVgvtvhfgBscq8MOtVNCZNorI014bwC9uNf8BnGX9+9gU7jtUV40HDQmSF/qc mzdQcCyYzBZNrlCWMICRzNrPnIdIfVawBDMz8=
Domainkey-signature:	a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type :content-transfer-encoding:content-disposition; b=ZiKedBROUnha5QGU7lZsW9IQ2aTUi6okr+rpCR/N6MZAstAFjVgsv1RFBjWZgdtHbk d79k0+PJtuWrT7tQbfYhoU9PdWgMek6z8F/x4uenT0UtfipAdxKKvMDrh4falMmpQF7I 2PQyH0Q1xHiVh3iGZf5eaNjpixq1cpHwSSObE=
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
List-help:	<mailto:xen-users-request@lists.xensource.com?subject=help>
List-id:	Xen user discussion <xen-users.lists.xensource.com>
List-post:	<mailto:xen-users@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-users-bounces@xxxxxxxxxxxxxxxxxxx

Hi everybody!

I know this is an ultraknown issue, but in my case i think
it is going beyond.
As you may guess my domUs clocks go faster or slower
They come with the same OS (Centos 5 2.6.18-92.1.18.el5 ) but each of them
have a different clock speed.

Why? Dom0 does not syncronize domUs  :
So i watched out looking for any solution....

First attempt:

/proc/sys/xen/independent_wallclock  = 0
 /proc/sys/xen/permitted_clock_jitter = 10000000

I tried weither disabling acpi and apic for domUs .

It didn't work

Second attempt:

/proc/sys/xen/independent_wallclock  = 0

ntpd on domUs .

It works but as the clocks run too fast after
a bunch of days it losts synchronization because
the drifts are too big.

More infos:

dom0 is Centos 5, my server is an hp proliant ml350 G5,
, everything works in full virtualisation.

Any suggestion?

Cheers,

Fab.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

WARNING - OLD ARCHIVES

xen-users

[Xen-users] domUs Clock synchronisation