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- .TH "CPUPOWER-IDLE-SET" "1" "0.1" "" "cpupower Manual"
- .SH "NAME"
- .LP
- cpupower idle\-set \- Utility to set cpu idle state specific kernel options
- .SH "SYNTAX"
- .LP
- cpupower [ \-c cpulist ] idle\-info [\fIoptions\fP]
- .SH "DESCRIPTION"
- .LP
- The cpupower idle\-set subcommand allows to set cpu idle, also called cpu
- sleep state, specific options offered by the kernel. One example is disabling
- sleep states. This can be handy for power vs performance tuning.
- .SH "OPTIONS"
- .LP
- .TP
- \fB\-d\fR \fB\-\-disable\fR
- Disable a specific processor sleep state.
- .TP
- \fB\-e\fR \fB\-\-enable\fR
- Enable a specific processor sleep state.
- .SH "REMARKS"
- .LP
- Cpuidle Governors Policy on Disabling Sleep States
- .RS 4
- Depending on the used cpuidle governor, implementing the kernel policy
- how to choose sleep states, subsequent sleep states on this core, might get
- disabled as well.
- There are two cpuidle governors ladder and menu. While the ladder
- governor is always available, if CONFIG_CPU_IDLE is selected, the
- menu governor additionally requires CONFIG_NO_HZ.
- The behavior and the effect of the disable variable depends on the
- implementation of a particular governor. In the ladder governor, for
- example, it is not coherent, i.e. if one is disabling a light state,
- then all deeper states are disabled as well. Likewise, if one enables a
- deep state but a lighter state still is disabled, then this has no effect.
- .RE
- .LP
- Disabling the Lightest Sleep State may not have any Affect
- .RS 4
- If criteria are not met to enter deeper sleep states and the lightest sleep
- state is chosen when idle, the kernel may still enter this sleep state,
- irrespective of whether it is disabled or not. This is also reflected in
- the usage count of the disabled sleep state when using the cpupower idle-info
- command.
- .RE
- .LP
- Selecting specific CPU Cores
- .RS 4
- By default processor sleep states of all CPU cores are set. Please refer
- to the cpupower(1) manpage in the \-\-cpu option section how to disable
- C-states of specific cores.
- .RE
- .SH "FILES"
- .nf
- \fI/sys/devices/system/cpu/cpu*/cpuidle/state*\fP
- \fI/sys/devices/system/cpu/cpuidle/*\fP
- .fi
- .SH "AUTHORS"
- .nf
- Thomas Renninger <trenn@suse.de>
- .fi
- .SH "SEE ALSO"
- .LP
- cpupower(1), cpupower\-monitor(1), cpupower\-info(1), cpupower\-set(1),
- cpupower\-idle\-info(1)
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