mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
938bb850d5
The token before "-" should be the program name, no spaces allowed. See man(7) and lexgrog(1). Signed-off-by: Mattia Dongili <malattia@linux.it> Signed-off-by: Thomas Renninger <trenn@suse.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
80 lines
2.5 KiB
Groff
80 lines
2.5 KiB
Groff
.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 <STATE_NO>
|
|
Disable a specific processor sleep state.
|
|
.TP
|
|
\fB\-e\fR \fB\-\-enable\fR <STATE_NO>
|
|
Enable a specific processor sleep state.
|
|
.TP
|
|
\fB\-D\fR \fB\-\-disable-by-latency\fR <LATENCY>
|
|
Disable all idle states with a equal or higher latency than <LATENCY>.
|
|
|
|
Enable all idle states with a latency lower than <LATENCY>.
|
|
.TP
|
|
\fB\-E\fR \fB\-\-enable-all\fR
|
|
Enable all idle states if not enabled already.
|
|
|
|
.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)
|