[Xen-users] Time synchronization on Xen 3.4.1 + linux 2.6.31.4/pv_ops

[Bartosz Lis <bartoszl@xxxxxxxxxxxxx>]

Hello,

I have Xen 3.4.1 and linux 2.6.31.4 with pv_ops running on a dual processor 
AMD Opteron 248 as well as on an uniprocessor Intel Celeron testbeds. 

I'm trying to synchronize clocks. Synchronization under dom0 with use of ntpd 
works fine. 

DomU time slowly drifts from dom0 time. As a workaround I have setup ntpd 
under domU, too. It works, but synchronization is very rough: system time 
drifts, and when the offset measured by ntpd is about 750ms, it sets system 
time to network time. How can I synchronize to dom0 clock to have the time run 
in a more smooth fashion?

There is no xen subtree in /proc/sys, so I could chceck 
/proc/sys/xen/independent_wallclock . Should I do something during system 
startup to have that tree or is that tree no more available? 

And more generally: is there a place where current logic behind XEN 
timekeepeing is documented?

Kind regards,

-- 
Bartosz Lis @ Institute of Comp. Science, Technical University of Lodz, Poland
   bartoszl @ ics.p.lodz.pl

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