linux-kernel - Re: Linux, 2.6.23-rc5, powersaving degradation, (time spend in C0 goes up after a while)

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Message-ID: <20070902114017.15800e42@laptopd505.fenrus.org>
Date:	Sun, 2 Sep 2007 11:40:17 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Christian Leber <christian@...er.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Linux, 2.6.23-rc5, powersaving degradation, (time spend in C0
 goes up after a while)

On Sun, 2 Sep 2007 19:40:38 +0200
Christian Leber <christian@...er.de> wrote:

> Hello,
> 
> I have observed some oddness in the powersaving behavior in rc5 and
> the rcs before and i suspect this may be scheduler related.
> 
> After booting or resuming from drisk or ram(!) the wakeups are about
> 45 per second (about 1% C0 (cpu runng)) and after
> about half an hour to hours of doing nothing with the laptop besides
> having a powertop in konsole the wakeups rise to about 6200 and the
> cpu is running 55% of the time.
> 
> (with rc3 this was odder, it took three time pretty exactly 43min
> until this occured)
> 
> I appended the output of powertop and the .config.
> But powertop doesn't even show the reason for the wakeups, probably
> they don't exist, but the power usage really goes up.
> 
> The hardware is btw. Dell latitude d830 (intel T7300, intel wlan and
> gfx)
> 

can you give us an lspci -vvxx of the system when it's in this "bad"
state? We have a very vague suspicion on something like this, the lspci
would help us a lot (this is a really rare thing that we can't really
reproduce, but it has been reported a few times before)
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