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Paravirtualized guests within Xen are currently configured to sync their clocks to the dom0 host. This can be problematic in situations where guest clocks need to be in sync with another time source. To change this behavior, the following command must be run:
# echo 1 > /proc/sys/xen/independent_wallclock
In order to make the change survive reboots, add the following line to /etc/sysctl.conf
xen.independent_wallclock=1
Fully virtualized guests are able to sync via ntp without these steps.