print and manage the clock frequency of CPU cores
is a command line application to set the clock frequency of CPU cores. Since only priviledged users are allowed to change the frequency of CPU cores, the application works in combination with a daemon
The daemon needs the suid permission bit to be set in order to manipulate the sysfs entries. With
the clock of all cores inside a the cpu_list or affinity domain can be set to a specific frequency or governor at once.
works only with the kernel module
module does not allow one to set fixed frequencies. In order to deactivate
add 'intel_pstate=disable' to your kernel boot commandline (commonly in grub) and load the
prints a help message to standard output, then exits.
prints the current frequencies for all CPU cores
prints all configurable frequencies
prints all configurable governors
- -c <cpu_list>
set the affinity domain where to set the frequencies. Common are N (Node), SX (Socket X), CX (Cache Group X) and MX (Memory Group X).
For detailed information about affinity domains see
- -g <governor>
set the governor of all CPU cores inside the affinity domain. Current governors are ondemand, performance, turbo. Default is ondemand
- -f, --freq <frequency>
set a fixed frequency at all CPU cores inside the affinity domain. Implicitly sets userspace governor for the cores.