1 .TH CPUPOWER\-SET "1" "22/02/2011" "" "cpupowe
2 .SH NAME
3 cpupower\-set \- Set processor power related k
4 .SH SYNOPSIS
5 .ft B
6 .B cpupower set [ \-b VAL ]
7
8
9 .SH DESCRIPTION
10 \fBcpupower set \fP sets kernel configurations
11 registers affecting processor power saving pol
12
13 Some options are platform wide, some affect si
14 are applied on all cores. How to modify single
15 described in the cpupower(1) manpage in the \-
16 option affects the whole system or can be appl
17 described in the Options sections.
18
19 Use \fBcpupower info \fP to read out current s
20 supported on the system at all.
21
22 .SH Options
23 .PP
24 \-\-perf-bias, \-b
25 .RS 4
26 Sets a register on supported Intel processore
27 its policy for the relative importance of perf
28 the processor.
29
30 The range of valid numbers is 0-15, where 0 is
31 performance and 15 is maximum energy efficienc
32
33 The processor uses this information in model-s
34 when it must select trade-offs between perform
35 energy efficiency.
36
37 This policy hint does not supersede Processor
38 (P-states) or CPU Idle power states (C-states)
39 software to have influence where it would othe
40 to express a preference.
41
42 For example, this setting may tell the hardwar
43 aggressively or conservatively to control freq
44 in the "turbo range" above the explicitly OS-c
45 P-state frequency range. It may also tell the
46 how aggressively it should enter the OS reques
47
48 This option can be applied to individual cores
49 cpupower(1).
50
51 Setting the performance bias value on one CPU
52 related CPUs as well (for example all CPUs on
53 hardware restrictions.
54 Use \fBcpupower -c all info -b\fP to verify.
55
56 This options needs the msr kernel driver (CONF
57 .RE
58
59 .SH "SEE ALSO"
60 cpupower-info(1), cpupower-monitor(1), powerto
61 .PP
62 .SH AUTHORS
63 .nf
64 \-\-perf\-bias parts written by Len Brown <len.
65 Thomas Renninger <trenn@suse.de>
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