On Fri, Nov 16, 2007 at 07:07:00AM +0100, Ingo Molnar wrote:
> > My best guess is that this has something to do with the timing with
> > which we sample the CPU's instantaneous load when calculating the load
> > averages.. but I still understand only the basics of the scheduler and
> > SMP balancer. All I really know for sure at this point regarding your
> > patch is that git-bisect found it for me.
>
> hm, your code uses timeouts for this, right? The CPU load average that
> is used for SMP load balancing is sampled from the scheduler tick - and
> has been sampled from the scheduler tick for eons. v2.6.23 defaulted to
> a different method but v2.6.24 samples it from the tick again. So my
> guess is, your testcode behave similarly on 2.6.22 too, correct?
My sample program (and the VMware code which I originally observed
this behaviour with) wakes up frequently using /dev/rtc.
I know the problem occurs on 2.6.20 and 2.6.23.1. I haven't tried
2.6.22 yet, but I'll do so as soon as I can.
Thanks,
--Micah
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