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The file 

/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_frequency

reads a value of 800 Mhz. The powertop tool also suggested that 800 Mhz w3as the minimum frequency being used.

I changed the above-mentioned file to 1.6 GHz and monitored powertop tool again. To my surprise, it still said that the minimum frequency was 800 MHz instead of 1.6 GHz.

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Run the following command:

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

Its output is probably one line for each core/cpu that you have saying ondemand. This means that when the CPU is not in use, it will go back to the lowest speed.

Btw, the files /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_governors will tell you the available governors and you can take a look at governors.txt to see the behavior of each of them.

You will have to first set the appropriate governor and then set the desired speed.

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  • I have set it to Ondemand . I want the minimum frequency to be 1.6 Ghz instead of 800 Mhz , which I'm not able to
    – kashyapa
    Nov 17, 2009 at 3:51
  • In that case, the easiest way is to use 'userspace' and a daemon like cpuspeed(8), which has an option for what you want (-m).
    – Gonzalo
    Nov 17, 2009 at 14:52

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