[Xen-users] "Time went backwards" issue

[Aleix Dorca <adorca@xxxxxx>]

Hi,

I've been running 8 Xen machines for about 9 months now (Ubuntu 8.04  
LTS DomU and Xen 3.3.0).
I've been migrating since all previous services that ran on low-budget  
machines into brand new PowerEdge 1950 III Dell servers. Till last  
week I still had some Windows services to migrate. When I did, the xen  
machine running them hanged and crashed.
This was a complete surprise because all other xen's (same  
configurations and hardware) had NEVER failed at all. After looking at  
the logs I found the misterious "Time went backwards" issue that has  
been discusses little on this list. I had like fifteen "errors" in a  
half hour period.
I restarted the machine on thuesday and has been working fine since  
(almost a week), but the ocassional (once or twice per day) "Time went  
backawards" still appears but doesn't hang the computer.
This issue only happens on the xen machine that run Windows HVM  
domU's, and never happens on Xen with PV domU. Quite strange.
Now the questions: Should I use the "clockwall=1" on all windows HVM  
xen machines? Should I change from xen to jiffies clocksource?  
Upgrading to 3.3.1 will help? Maybe changing the Dom0 kernel? (Debian  
Lenny?)
Thanks a lot guys, this is really keeping me awake!

Aleix.

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