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How useful and important is cpu frequency scaling? I read somewhere that some larger distros have this already set up. How do I find out if it is activated in my installation and how much difference it is making? What will be the best/easiest application to monitor and adjust it. Thanks for your help.
files in /sys/devices/system/cpu/cpu0/cpufreq/ provide information and a means of controlling the frequency scaling subsystem. Seed values are given in Khz. You need to be root to access the /sys filesystem.
Your max speed is at /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq.
With older CPUs, frequency scaling will not work. Almost all distros will setup frequency scaling if its supported (so far as I know they all will, but there might be a few that dont).
*edit- of course arch (and other distros with similar driving ideas) wouldnt have it setup 'out of the box'.
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