cpufreq-set
modify CPU frequency scaling settings
TLDR
SYNOPSIS
cpufreq-set [options]
DESCRIPTION
cpufreq-set modifies the Linux kernel cpufreq policy for a CPU, adjusting the scaling governor, minimum and maximum frequencies, or pinning a fixed frequency. It is part of the cpufrequtils package.Frequency values accept the suffixes `Hz`, `kHz` (default if no unit given), `MHz`, `GHz`, and `THz` appended directly to the number (for example `2400MHz` or `2.4GHz`). Valid values for the current CPU can be discovered with `cpufreq-info -l`.
PARAMETERS
-c, --cpu cpu
CPU number to operate on. Defaults to CPU 0 when omitted.-d, --min freq
Set the minimum frequency the governor may select.-u, --max freq
Set the maximum frequency the governor may select.-g, --governor governor
Select the scaling governor (e.g. `performance`, `powersave`, `ondemand`, `conservative`, `schedutil`, `userspace`).-f, --freq freq
Pin the CPU to a specific frequency. Requires the `userspace` governor and cannot be combined with `-d`, `-u`, or `-g`.-r, --related
Also apply the change to every CPU hardware-related to the selected one.-h, --help
Show help.
CAVEATS
Requires root privileges (or write access to `/sys/devices/system/cpu/cpu*/cpufreq/`). Pinning a fixed frequency only works when the `userspace` governor is active and loaded. Available governors depend on kernel configuration. Settings are not persisted across reboots; use a systemd unit or the `cpufrequtils` service to restore them at boot. On modern kernels using the `intel_pstate` driver, only the `performance` and `powersave` governors may be available.
HISTORY
cpufreq-set ships with cpufrequtils, originally written by Dominik Brodowski. The newer cpupower suite (from the kernel tree) largely supersedes cpufrequtils on recent distributions.
SEE ALSO
cpufreq-info(1), cpupower(1)
