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Xen's clock drifts by about 1.3 seconds per hour?

I'm using ntpdate run from cron to keep domain0's clock in sync on my
NetBSD/xen host.

Check this out:

Jul 17 05:10:07 schreber ntpdate[2648]: step time server offset 
1.401913 sec
Jul 17 06:10:11 schreber ntpdate[2716]: step time server offset 
1.331952 sec
Jul 17 07:10:10 schreber ntpdate[2718]: step time server offset 
1.349363 sec
Jul 17 08:10:06 schreber ntpdate[2892]: step time server offset 
1.336152 sec
Jul 17 09:10:06 schreber ntpdate[2601]: step time server offset 
1.361529 sec
Jul 17 10:10:16 schreber ntpdate[1298]: step time server offset 
1.328597 sec
Jul 17 11:10:06 schreber ntpdate[3023]: step time server offset 1.34
1949 sec
Jul 17 12:10:05 schreber ntpdate[1395]: step time server offset 
1.344900 sec

Gee, that's an awfully consistent error.  Do we and the hypervisor have a
slight disagreement about the timer frequency?

 Thor Lancelot Simon                                          
   But as he knew no bad language, he had called him all the names of common
 objects that he could think of, and had screamed: "You lamp!  You towel!  You
 plate!" and so on.              --Sigmund Freud

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