Re: [Xen-users] Xen timekeeping best practices

[Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx>]

Lloyd Dizon wrote:
> Hi,
> Just wondering what is the best practice for timekeeping in Xen, on 
> HVMs and PVMs.
> I found lots of information that DomUs should sync with it's Dom0.
>
> However, there are also alot of posts for VMs timedrifting even if the 
> Dom0 is properly synced.
> So it in the end, it seems it is better to treat the VM as an 
> independent timekeeper and sync it using NTP.
> What are your thoughts? Is there an official answer out there?
> Should it be assumed that somehow a VM is improperly configured with 
> regard to its Dom0 when it timedrifts?
There's a pretty good discussion on the Debian Xen Wiki, at
http://wiki.debian.org/Xen
scroll down or search the page for the section starting: 'clocksource/0: 
Time went backwards' - which lists several workarounds
note that some of them no longer work with Xen 4 (I think 
xen.independent_wallclock=1 is no longer recognized)
--
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra



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