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Re: [Xen-users] Xen timekeeping best practices

On Fri, Apr 13, 2012 at 6:31 PM, Remi Gacogne <rgacogne-xen@xxxxxxxxxxxx> wrote:
>> Does this help at all:
>> http://wiki.xensource.com/wiki/Xen_FAQ_DomU#How_can_i_synchronize_a_dom0_clock.3F
> Well, thank you but independent_wallclock doesn't exist anymore on pvops
> kernel,

I think it still exists, I found the info below in the last SUSE 11 SP
2 release (13.04.2012).
This versions runs the 3.0.10 linux kernel with includes pvops.

http://www.suse.com/releasenotes/x86_64/SUSE-SLES/11-SP2/ Time Synchronization in titlevirtualized Domains with NTP

Paravirtualized (PV) DomUs usually receive the time from the
hypervisor. If you want to run "ntp" in PV DomUs, the DomU must be
decoupled from the Dom0's time. At runtime, this is done with:

echo 1 > /proc/sys/xen/independent_wallclock

To set this at boot time:

    either append "independent_wallclock=1" to kernel cmd line in
DomU's grub configuration file

    or append "xen.independent_wallclock = 1" to /etc/sysctl.conf in the DomU.

If you encounter time synchronization issues with Paravirtualized
Domains, we encourage you to use NTP.


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