Re: cpufreq and p4 prescott

[clemens kurtenbach <moqua@kurtenba.ch>]

Hi,

>>[ck@holodeck:cpufreq] cat /proc/cpuinfo | grep Mhz
>>cpu MHz         : 2807.131
>>cpu MHz         : 2807.131
> 
> The cpu MHz entry in /proc/cpuinfo is the same for all CPUs, and no reliable
> source to detect the current cpu frequency anyway.  Use

i thought this because on my ibook i can see different MHz
entry's when cpudyn changes the frequence.

> /sys/devices/system/cpu/cpu0/scaling_cur_freq or even cpuinfo_cur_freq for
> that.[*] So p4-clockmod-throttling does work on your p4 prescott.
> 
> 	Dominik
> 
> [*] Available in 2.6.7, hopefully, if Linus merges the latest cpufreq-bk
> tree from Dave. It'll be in the next -mm release, though.

o.k, when i understand you right p4-clockmod-throttling _is working_
on my system, but i can't see this in /sys until Dave Jones
patches are includet. So i patched my 2.6.6 kernel with
cpufreq-2004-05-13.diff.

Now cpuinfo_cur_freq and scaling_cur_freq show changing entry's
when eg powernowd handles the frequence.

The reason why i want to throttle down my prescott is the heat.
Strange is that when the frequence is changed to 350MHz
(after 30min running with 2.8GHz), neither the CPU&System temperature
nor tools that calculate the CPU speed (like gkrellm-x86info)
show a difference to 2.8GHz. All voltages on my system are the
same with 350MHz/2.8GHz, too.

So i'm not sure if throttling does work until now?

thanks,
clee
-- 
moqua [at] gmx.net
moqua [at] kurtenba.ch