Colin Ian King wrote:
> Hi,
>
> I've noticed that there a quite a few users reporting excessive amounts
> of "Rescheduling Interrupts" from multi core machines, and it seems
> concerting that the scheduler is pulling the processors out of C3 states
> rather a lot. In some cases, there are reports of >10,000 Rescheduling
> Interrupts a second, which seems excessive.
>
> The following rune apparently should help, but it does not make (much)
> of a significant change:
>
> echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
this only does something on multi-socket systems, not on dual core single
socket systems.
>
> Since it may be draining excessive amounts of power are there ideas if
> this a scheduling problem and how to resolve this?
> Thanks,
it's a combination of two things:
1) An application or interrupt IS waking things up at that frequency.
It's currently hard to track down which one; it may need kernel changes
to be able to find out.
2) The scheduler lately seems very trigger happy to do a remote wakeup rather
than
local wakeups for the wakups done by 1)
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