---
name: "cpupower-set"
section: "1"
platform: "linux"
package: "cpupower"
version: "7.3.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/cpupower-set"
---

# cpupower-set(1)

Set processor power related kernel or hardware configurations

## NAME

cpupower-set - Set processor power related kernel or hardware configurations

## SYNOPSIS

**cpupower set \[ -b VAL \| -e POLICY \| -m MODE \| -t BOOL \]**

## DESCRIPTION

**cpupower set  sets kernel configurations or directly accesses hardware** **registers affecting processor power saving policies.**

**Some options are platform wide, some affect single cores. By default values** **are applied on all cores. How to modify single core configurations is** **described in the [cpupower(1)](/cpupower/1.md) manpage in the --cpu option section. Whether an** **option affects the whole system or can be applied to individual cores is** **described in the Options sections.**

**Use cpupower info  to read out current settings and whether they are** **supported on the system at all.**

## OPTIONS

- **--perf-bias, -b**

  **Sets a register on supported Intel processore which allows software to convey** **its policy for the relative importance of performance versus energy savings to** **the  processor.**

  **The range of valid numbers is 0-15, where 0 is maximum** **performance and 15 is maximum energy efficiency.**

  **The processor uses this information in model-specific ways** **when it must select trade-offs between performance and** **energy efficiency.**

  **This policy hint does not supersede Processor Performance states** **(P-states) or CPU Idle power states (C-states), but allows** **software to have influence where it would otherwise be unable** **to express a preference.**

  **For example, this setting may tell the hardware how** **aggressively or conservatively to control frequency** **in the "turbo range" above the explicitly OS-controlled** **P-state frequency range.  It may also tell the hardware** **how aggressively it should enter the OS requested C-states.**

  **This option can be applied to individual cores only via the --cpu option,** **[cpupower(1)](/cpupower/1.md).**

  **Setting the performance bias value on one CPU can modify the setting on** **related CPUs as well (for example all CPUs on one socket), because of** **hardware restrictions.** **Use cpupower -c all info -b to verify.**

  **This options needs the msr kernel driver (CONFIG\_X86\_MSR) loaded.**

- **--epp, -e**

  **Sets the energy performance policy preference on supported Intel or AMD** **processors which use the Intel or AMD P-State cpufreq driver respectively.**

  **Available policies can be found with** **cat /sys/devices/system/cpu/cpufreq/policy0/energy\_performance\_available\_preferences :**

  **default performance balance\_performance balance\_power power**

- **--amd-pstate-mode, -m**

  **Sets the AMD P-State mode for supported AMD processors.** **Available modes are "active", "guided" or "passive".**

  **Refer to the AMD P-State kernel documentation for further information.**

- **--turbo-boost, --boost, -t**

  **This option is used to enable or disable the boost feature on** **supported Intel and AMD processors, and other boost supported systems.** **(The --boost option is an alias for the --turbo-boost option)**

  **This option takes as parameter either 1 to enable, or 0 to disable the feature.**

## SEE ALSO

**[cpupower-info(1)](/cpupower-info/1.md), [cpupower-monitor(1)](/cpupower-monitor/1.md), [powertop(1)](/powertop/1.md)**

## AUTHORS

```
--perf-bias parts written by Len Brown <len.brown@intel.com>
Thomas Renninger <trenn@suse.de>
```