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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) manpage 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 system at all.

Options

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

       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 frequency 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@intel.com>
   Thomas Renninger <trenn@suse.de>

                              22/02/2011                   CPUPOWER-SET(1)



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