cpupower-set(1) - phpMan

CPUPOWER-SET(1)                          cpupower Manual                          CPUPOWER-SET(1)



NAME
       cpupower-set - Set processor power related kernel or hardware configurations

SYNOPSIS
       cpupower set [ -b VAL ]



DESCRIPTION
       cpupower set  sets kernel configurations or directly accesses hardware registers affecting
       processor power saving policies.

       Some options are platform wide, some affect single cores. By default values are applied on
       all  cores.  How to modify single core configurations is described in the cpupower(1) man-
       page in the --cpu option section. Whether an option affects the whole  system  or  can  be
       applied to individual cores is described in the Options sections.

       Use cpupower info  to read out current settings and whether they are supported on the sys-
       tem at all.


Options
       --perf-bias, -b
           Sets a register on supported Intel processore which allows software to convey its pol-
           icy  for  the relative importance of performance versus energy savings to the  proces-
           sor.

           The range of valid numbers is 0-15, where 0 is maximum performance and 15  is  maximum
           energy efficiency.

           The  processor uses this information in model-specific ways when it must select trade-
           offs between performance and energy efficiency.

           This policy hint does not supersede Processor Performance  states  (P-states)  or  CPU
           Idle  power  states  (C-states),  but allows software to have influence where it would
           otherwise be unable to express a preference.

           For example, this setting may tell the hardware how aggressively or conservatively  to
           control frequency in the "turbo range" above the explicitly OS-controlled P-state fre-
           quency range.  It may also tell the hardware how aggressively it should enter  the  OS
           requested C-states.

           This option can be applied to individual cores only via the --cpu option, cpupower(1).

           Setting  the  performance bias value on one CPU can modify the setting on related CPUs
           as well (for example all CPUs on one socket), because of hardware  restrictions.   Use
           cpupower -c all info -b to verify.

           This options needs the msr kernel driver (CONFIG_X86_MSR) loaded.


SEE ALSO
       cpupower-info(1), cpupower-monitor(1), powertop(1)

AUTHORS
       --perf-bias parts written by Len Brown <len.brown AT intel.com>
       Thomas Renninger <trenn AT suse.de>



                                            22/02/2011                            CPUPOWER-SET(1)

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