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[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
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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?



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