cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpupower-idle-set.1 (2569B)

      1.TH "CPUPOWER-IDLE-SET" "1" "0.1" "" "cpupower Manual"
      2.SH "NAME"
      3.LP
      4cpupower\-idle\-set \- Utility to set cpu idle state specific kernel options
      5.SH "SYNTAX"
      6.LP
      7cpupower [ \-c cpulist ] idle\-set [\fIoptions\fP]
      8.SH "DESCRIPTION"
      9.LP
     10The cpupower idle\-set subcommand allows to set cpu idle, also called cpu
     11sleep state, specific options offered by the kernel. One example is disabling
     12sleep states. This can be handy for power vs performance tuning.
     13.SH "OPTIONS"
     14.LP
     15.TP
     16\fB\-d\fR \fB\-\-disable\fR <STATE_NO>
     17Disable a specific processor sleep state.
     18.TP
     19\fB\-e\fR \fB\-\-enable\fR <STATE_NO>
     20Enable a specific processor sleep state.
     21.TP
     22\fB\-D\fR \fB\-\-disable-by-latency\fR <LATENCY>
     23Disable all idle states with a equal or higher latency than <LATENCY>.
     24
     25Enable all idle states with a latency lower than <LATENCY>.
     26.TP
     27\fB\-E\fR \fB\-\-enable-all\fR
     28Enable all idle states if not enabled already.
     29
     30.SH "REMARKS"
     31.LP
     32Cpuidle Governors Policy on Disabling Sleep States
     33
     34.RS 4
     35Depending on the used  cpuidle governor, implementing the kernel policy
     36how to choose sleep states, subsequent sleep states on this core, might get
     37disabled as well.
     38
     39There are two cpuidle governors ladder and menu. While the ladder
     40governor is always available, if CONFIG_CPU_IDLE is selected, the
     41menu governor additionally requires CONFIG_NO_HZ.
     42
     43The behavior and the effect of the disable variable depends on the
     44implementation of a particular governor. In the ladder governor, for
     45example, it is not coherent, i.e. if one is disabling a light state,
     46then all deeper states are disabled as well. Likewise, if one enables a
     47deep state but a lighter state still is disabled, then this has no effect.
     48.RE
     49.LP
     50Disabling the Lightest Sleep State may not have any Affect
     51
     52.RS 4
     53If criteria are not met to enter deeper sleep states and the lightest sleep
     54state is chosen when idle, the kernel may still enter this sleep state,
     55irrespective of whether it is disabled or not. This is also reflected in
     56the usage count of the disabled sleep state when using the cpupower idle-info
     57command.
     58.RE
     59.LP
     60Selecting specific CPU Cores
     61
     62.RS 4
     63By default processor sleep states of all CPU cores are set. Please refer
     64to the cpupower(1) manpage in the \-\-cpu option section how to disable
     65C-states of specific cores.
     66.RE
     67.SH "FILES"
     68.nf
     69\fI/sys/devices/system/cpu/cpu*/cpuidle/state*\fP
     70\fI/sys/devices/system/cpu/cpuidle/*\fP
     71.fi
     72.SH "AUTHORS"
     73.nf
     74Thomas Renninger <trenn@suse.de>
     75.fi
     76.SH "SEE ALSO"
     77.LP
     78cpupower(1), cpupower\-monitor(1), cpupower\-info(1), cpupower\-set(1),
     79cpupower\-idle\-info(1)