6 .Nd device driver for Intel performance-energy bias support
8 To compile this driver into the kernel,
9 place the following line in your
10 kernel configuration file:
11 .Bd -ragged -offset indent
15 Alternatively, to load the driver as a
16 module at boot time, place the following line in
18 .Bd -literal -offset indent
24 driver provides support for Intel performance-energy bias,
25 which allows OS to guide logical CPU heuristic of power management features
26 to favor increasing dynamic performance or conserve energy consumption.
27 Each logical CPU could has its own performance-energy bias setting.
29 Each logical CPU's performance-energy bias is controlled through the
30 .Va machdep.perfbias Ns Em X
35 is the logical CPU id.
36 .Bl -tag -width "hint"
38 Valid value ranges from 0 to 15, inclusive.
39 Set it to 0 to give the highest performance.
40 Set it to 15 to maximize energy saving.