3.2.2. CPUfreq Setup

Procedure 3.1. How to Add a CPUfreq Driver

1. Use the following command to view which CPUfreq drivers are available for your system:

   ls /lib/modules/[kernel version]/kernel/arch/[architecture]/kernel/cpu/cpufreq/

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2. Use modprobe to add the appropriate CPUfreq driver.

   modprobe [CPUfreq driver]

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   When using the above command, be sure to remove the .ko filename suffix.

   Important

   When choosing an appropriate CPUfreq driver, always choose acpi-cpufreq over p4-clockmod. While using the p4-clockmod driver reduces the clock frequency of a CPU, it does not reduce the voltage. acpi-cpufreq, on the other hand, reduces voltage along with CPU clock frequency, allowing less power consumption and heat output for each unit reduction in performance.

Procedure 3.2. Enabling a CPUfreq Governor

1. If a specific governor is not listed as available for your CPU, use modprobe to enable the governor you wish to use:

   modprobe [governor]

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   Example 3.1. Enabling a Governor

   If the ondemand governor is not available for your CPU, use the following command:

   modprobe cpufreq_ondemand

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2. Once a governor is listed as available for your CPU, you can enable it using:

   cpupower frequency-set --governor [governor]

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