On Mon, Mar 16, Per Jessen wrote:

> After having migrated a number of systems to a xen setup, I am seeing
> this "Time has been changed" message from systemd twice a minute in the
> guest systems (once per systemd daemon).  The host is running ntpd, the
> guests aren't.  Both host and guests are using openSUSE 13.2 + latest
> updates. 

I remember such systemd output, looks like a bug in that component.

I dont know much about time keeping. My understanding is that Xen does a
reasonable good job of keeping dom0 and domU time in sync. I think the
only requirement or recommendation is that dom0 runs ntpd.

There is some knob to make a domU not use dom0 time, not sure if you
have that enabled for your domUs. But such knob may only apply to PV
guests.


Olaf
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