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Re: [Xen-users] Xen timekeeping best practices


Miles Fidelman wrote:
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)

I second that. While it was possible to get a pretty accurate time in Xen 3 by using independent_wallclock, I have been unable to do so with Xen 4 so far.

We have several Xen 4.0.1 production servers, and even by using NTP in dom0 AND domU we have a recurring problem where the clock goes out of sync for an hour or so. Using NTP in each domU with the "disable kernel" option seems to help a bit, but for some users needing less than a few seconds of time drift it is a real issue.

I am currently thinking of downgrading some users to Xen 3 to work around this..



Remi Gacogne

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