DragonFly On-Line Manual Pages

PERFBIAS(4)           DragonFly Kernel Interfaces Manual           PERFBIAS(4)

NAME
     perfbias -- device driver for Intel performance-energy bias support

SYNOPSIS
     To compile this driver into the kernel, place the following line in your
     kernel configuration file:

           device perfbias

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           perfbias_load="YES"

DESCRIPTION
     The perfbias driver provides support for Intel performance-energy bias,
     which allows OS to guide logical CPU heuristic of power management
     features to favor increasing dynamic performance or conserve energy
     consumption.  Each logical CPU could has its own performance-energy bias
     setting.

MIB Variables
     Each logical CPU's performance-energy bias is controlled through the
     machdep.perfbiasX branch of the sysctl(3) MIB.  X is the logical CPU id.

     hint  Valid value ranges from 0 to 15, inclusive.  Set it to 0 to give
           the highest performance.  Set it to 15 to maximize energy saving.

SEE ALSO
     sysctl(3), sysctl(8)

DragonFly 3.7                  February 17, 2014                 DragonFly 3.7