[Xen-bugs] [Bug 195] Many Timer ISR: Time went backwards logs

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=195


peters-xensource@xxxxxxxxxx changed:

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------- Comment #39 from peters-xensource@xxxxxxxxxx  2008-07-03 20:28 -------
(In reply to comment #38)
> Updated comment on this bug from Keir:
> 
> If this bug is still occurring with up-to-date Xen (basically xen-unstable or 
> a
> recent 3.2 release) then please post some specific details about the setup,
> workload, and precise symptoms.  
> 
> I'll emphasize that we do *not* see this regularly. In fact I don't think 
> we've
> seen it in any of our regular tests on a wide range of hardware in a very long
> time.  
> 

It seems like I have got hit by this bug and I can reproduce it with a
suspend/resume of a domU.
I'm running stock OpenSuse 10.3 so 

# xm dmesg|grep -E "Xen version|timer"
 Xen version 3.1.0_15042-51.3 (abuild@xxxxxxx) (gcc version 4.2.1 (SUSE Linux))
Thu Dec 20 19:57:34 UTC 2007
(XEN) Platform timer is 25.000MHz HPET

The systems in question are two dualcore athlon servers so SMP is involved in
the equation.

I had this issue that the domain locked up before but after changing
clocksource to jiffies at least that problem was resolved.
Now I started to play with xen migration and the showblocker is that after
suspend/resume the clock in domU starts to go all over the place including
backwards. Only way to recover is reboot domU, which defeats the whole purpose
of migration.


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