Re: [Xen-users] Xen timekeeping best practices

[Remi Gacogne <rgacogne-xen@xxxxxxxxxxxx>]

Hi,

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..

--

Regards,

Remi Gacogne


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users