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Date: Sun, 29 Mar 2009 10:21:33 +0200
From: Dominic Fandrey <kamikaze@bsdforen.de>
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To: Alexander Motin <mav@FreeBSD.org>
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Subject: Re: powerd broken
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Alexander Motin wrote:
> Dominic Fandrey wrote:
>> Since I updated to the 7.2 prerelease, powerd is broken.
>>
>>> uname -a
>> FreeBSD mobileKamikaze.norad 7.2-PRERELEASE FreeBSD 7.2-PRERELEASE #0:
>> Tue Mar 24 07:57:30 CET 2009    
>> root@mobileKamikaze.norad:/usr/obj/HP6510b/amd64/usr/src/sys/HP6510b 
>> amd64
>>
>> It increases the CPU frequency very aggressively in adaptive mode.
>> That means full speed with a system load below 1%. I have to use the
>> following nonsensical powerd_flags to make it work sensibly:
>> -a adaptive -b minimum -i 95 -r 99
>>
>> The system is a Core2 Duo, if that is of any help.
> 
> Run powerd in foreground with -v option to get it's work trace. If it
> reaches full speed, there must be some reason to do it.
> 
> Updated powerd indeed may behave a bit more aggressively (especially in
> new hiadaptive mode, default for AC power). But it was made several
> months ago and nobody have complained yet. I am personally using it on
> 8-CURRENT on my Core2Duo laptop every day.
> 

# grep powerd /etc/rc.conf
powerd_enable="YES"
#powerd_flags="-a adaptive -b minimum -i 95 -r 99"
powerd_flags="-a adaptive -b minimum -v"
# rcrestart powerd 
powerd not running?
Starting powerd.
powerd: using sysctl for AC line status
powerd: using devd for AC line status
load  77%, current freq 2400 MHz ( 0), wanted freq 2400 MHz
load  74%, current freq 2400 MHz ( 0), wanted freq 2400 MHz
load  78%, current freq 2400 MHz ( 0), wanted freq 2400 MHz
load  79%, current freq 2400 MHz ( 0), wanted freq 2400 MHz
load  65%, current freq 2400 MHz ( 0), wanted freq 2400 MHz
load  72%, current freq 2400 MHz ( 0), wanted freq 2400 MHz
load  76%, current freq 2400 MHz ( 0), wanted freq 2400 MHz
...

The real load was between 3 and 7 % while these were recorded.

Note that I use the normal/old adaptive mode.