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# [Default] All domains have the same time synchronized from ntp-client in dom0.
echo 0 > /proc/sys/xen/independent_wallclock

# If, however, this is not the case, you will have to run ntp-client on all guests. For this to work, you will need to set  to 1, i.e. 
echo 1 > /proc/sys/xen/independent_wallclock