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


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


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"


The perfbias driver provides support for Intel performance-energy bias, which allows OS to guide logical CPU heuristic of power management fea- tures to favor increasing dynamic performance or conserve energy consump- tion. Each logical CPU could has its own performance-energy bias set- ting. 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.


sysctl(3), sysctl(8) DragonFly 4.9 February 17, 2014 DragonFly 4.9

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