RE: [Xen-devel] cpuidle causing Dom0 soft lockups

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Jan Beulich [mailto:JBeulich@xxxxxxxxxx] 
>Sent: 2010年2月5日 16:49
>
>Yes, this patch works for us too. So a non-hacky version of it would be
>appreciated.
>
>I also meanwhile tried out the idea to reduce the contention on
>xtime_lock (attached for reference). Things appear to work fine, but
>there is an obvious problem (with - thus far to me - no obvious
>explanation) with it: The number of timer interrupts on CPUs not on
>duty to run do_timer() and alike is increasing significantly, 
>with spikes
>of over 100,000 per second. I'm investigating this, but of course any
>idea anyone of you might have what could be causing this would be
>very welcome.
>

forgive my poor english. From your patch, only cpu on duty will invoke
do_timer to update global timestamp. Why in your test it's CPUs 'not
on duty' to have high frequent do_timer? I may read it wrong. :-(

Thanks,
Kevin

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