3.2.2. CPUfreq Setup
Before selecting and configuring a
CPUfreq governor, you need to add the appropriate CPUfreq driver first.
Procedure 3.1. How to Add a CPUfreq Driver
- Use the following command to view which
CPUfreqdrivers are available for your system:ls /lib/modules/[kernel version]/kernel/arch/[architecture]/kernel/cpu/cpufreq/ - Use
modprobeto add the appropriateCPUfreqdriver.modprobe [CPUfreq driver]When using the above command, be sure to remove the.kofilename suffix.Important
When choosing an appropriate CPUfreq driver, always chooseacpi-cpufreqoverp4-clockmod. While using thep4-clockmoddriver 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.
You can also view which governors are available for use for a specific CPU using:
cpupower frequency-info --governors
Some CPUfreq governors may not be available for you to use. In this case, use
modprobe to add the necessary kernel modules that enable the specific CPUfreq governor you wish to use. These kernel modules are available in /lib/modules/[kernel version]/kernel/drivers/cpufreq/.
Procedure 3.2. Enabling a CPUfreq Governor
- If a specific governor is not listed as available for your CPU, use
modprobeto enable the governor you wish to use:modprobe [governor]Example 3.1. Enabling a Governor
If theondemandgovernor is not available for your CPU, use the following command:modprobe cpufreq_ondemand - Once a governor is listed as available for your CPU, you can enable it using:
cpupower frequency-set --governor [governor]
