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SubjectRe: nohz and strange sleep latencies

> > > but perhaps somehow we miss this fact and fail to turn off the lapic
> > > clockevents drivers?
> >
> > Ok, I guess I'm lost. If I offline second CPU, I immediately get
> > 1000Hz timer tick... is that expected?
> Hmm. No. I have no idea why this is happening.
> 34196 total events, 55.083 events/sec
> echo 0 >/sys/devices/system/cpu/cpu1/online
> 36073 total events, 54.679 events/sec

It happened again, this time on 2.6.24-pre-rc1 (mostly untainted).
Reboot and problem goes away... so this one is random :-(.

I'll try plug/unplug loops, perhaps that can trigger it reliably. (cpu
replug does not fix it once triggered).
(cesky, pictures)
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