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 perfbiasAlternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
perfbias_load="YES"
DESCRIPTION
Theperfbias 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.