linux-kernel - Re: high power consumption in recent kernels

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Message-ID: <20100709190902.GC1669@ucw.cz>
Date:	Fri, 9 Jul 2010 21:09:02 +0200
From:	Pavel Machek <pavel@....cz>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Norbert Preining <preining@...ic.at>, linux-kernel@...r.kernel.org,
	Arjan Van De Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, akpm <akpm@...ux-foundation.org>
Subject: Re: high power consumption in recent kernels

On Thu 2010-07-08 11:06:32, Peter Zijlstra 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.
>

14W vs 9W is very significant -- is some DMA keeping system from
entering C3? rmmod usb?
								Pavel

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