I’ve earlier encountered this bug at my Debian OS domU. You can see the bug with 2 possibility by executing date and issuing a ping. Executing date command constantly will show the date/time is inaccurately and dint follow what it had been set to. May see the ping average is far beyond the normal what it should be and it actually affect your domU connection.
The bug is written at http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1098 .
But, I am going to solve it by
- applying pygrub to domU
- run dpkg-reconfigure tzdata and select the appropriate time & zone
The point is switching domU to pygrub to let it load it own kernel will solve the problem.