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