How to manage guests clocks?

Hi all!
I have a one physical server with 4 paravirtualized guest Linux OS.
And after a while I've found that all guests clocks have a different values for system clocks. And the root OS with the hypervisor has a different value for it's clock.
As per "Oracle® VM Server User’s Guide" "E.6 Setting the Guest’s Clock " - "... If you want to set the hypervisor to manage paravirtualized guest system clocks, set xen.independent_wallclock to 0. Any attempts to set or modify the time in a guest will fail...."
But how in this case to synchronize guests clocks with a hypervizor clock?
Best regards,
Anton.

Seems like, setting xen.independent_wallclock to 0 would not do the trick atleast in this version of xen 3.1.3(google for xen clock) . May be we will have to use ntp in all the guests to keep all the domUs' date iin sync.

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