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)