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SubjectRe: high power consumption in recent kernels
On Thu, 08 Jul 2010 11:06:32 +0200
Peter Zijlstra <peterz@infradead.org> wrote:

> On Wed, 2010-07-07 at 01:45 +0900, Norbert Preining wrote:
>
> > it seems that some of the (?)recent(?) changes have increased the
> > power consumption of my note book considerably.
> >
> > First of all, running powertop with normal programs started, but
> > doing nothing, I am still at 14W while I could go down to 9W before
> > (but the 9W was with dimmed display).
> >
> > In the list of top causes for wakeup I have
> > Top causes for wakeups:
> > 34.2% (185.3) [kernel scheduler] Load balancing tick
> > 23.9% (129.6) [extra timer interrupt]
> > 10.8% ( 58.6) firefox-bin
> > 9.2% ( 49.7) [iwlagn] <interrupt>
> > 7.2% ( 39.1) [kernel core] hrtimer_start (tick_sched_timer)
> > 3.9% ( 20.9) PS/2 keyboard/mouse/touchpad interrupt
> > which show one new thing to me I haven't seen before, the Loa
> > balancing tick.
>
> I think that is what powertop calls our regular tick (Arjan?), and as

it's "hrtimer_start_range_ns (tick_sched_timer)" if it's done by the
idle thread.




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