Messages in this thread | | | Date | Thu, 13 May 2004 11:19:30 +0200 | From | clemens kurtenbach <> | Subject | Re: cpufreq and p4 prescott |
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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
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