[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





------- Additional Comments From koenig@xxxxxxxxxxxxxxxxxxxx  2006-02-15 17:12 
-------
one more data point for this quest:

I see the same "Timer ..." kernel messages on a dual-core dual-Opteron:

Timer ISR/2: Time went backwards: delta=-2665898 cpu_delta=13384384
shadow=446519338822167 off=982562370 processed=446520324050282
cpu_processed=446520308000000
 0: 446520320050282
 1: 446520324000000
 2: 446520308000000
 3: 446520316000000

# dmesg  |grep -c Timer
1023

# grep -c Timer /var/log/warn
14320 

from today 15:00:32 to 19:15:15, so ~1 message per second, but they show up in
long bursts with pretty random "idle" periods of ~30-300 seconds between those
bursts...



kernel being used (SUSE 10.1 SL-OSS-Factory):

 Xen version 3.0_8659-2 (abuild@xxxxxxx) (gcc version 4.1.0 20060123
(prerelease) (SUSE Linux)) Tue Jan 31 06:15:27 UTC 2006
 Latest ChangeSet: 8659

# xm dmesg | grep -i "platform timer"
(XEN) Platform timer is 1.193MHz PIT

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