CPU freq scaling
exvor0 at gmail.com
Wed Oct 31 04:32:17 PDT 2007
Walter Barnes wrote:
> I've just finished building LFS 6.3 and have started adding a few extras for my laptop (Fujitsu Lifebook, C Series). After reading Ken Moffat's cpufreq hint I've succesfully set up my system to use the conservative freq governor but I have a few questions...
> First, I've temporarily commented out the command to set ignore_nice in the boot script as it does not work. In particular, this path does not exist:
> Should it instead be:
> /sys/devices/system/cpu/cpu0/cpufreq/conservative/ignore_nice_load ?
> Also, there are several files under the conservative directory that, from their names, seem to control the freq govenor's behavior. Can someone point me to docs that expain what these files are and how to use them?
> Finally, my host system (Knoppix) can underclock my Pentium M (Dothan). The contents of the <cpufreq-path>/scaling_available_frequencies includes 400Mhz and 200Mhz. These are not present when I boot my LFS system (lowest is 600Mhz). Could someone also point me to any docs that expain how to do underclocking?
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With frequency scaling I found it much easier to use acpid and some
As for the underclocking do you mean that you can go under the speeds
that are listed for the cpu in cpufreq ? Not sure what you mean as the
power states/frequencies are determined by the hardware.
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