Re: cpufreq and p4 prescott

From: Dominik Brodowski
Date: Wed May 12 2004 - 12:17:26 EST

> i have problems scaling down my p4 prescott 2.8 GHz.
You can't scale a prescott, you can only throttle it.

> [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
/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.


[*] 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.
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