6 .Nd device driver for Intel software controlled clock modulation
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 software controlled clock modulation,
25 which reduces CPU core's duty cycle to reduce the power consumption.
26 A clock moduation domain contains logical CPUs on the same CPU core.
27 All logical CPUs in the same clock modulation domain will have the same
30 Clock modulation domain's information and controlling is provided by
31 .Va machdep.clockmod_dom Ns Em X
35 .Bl -tag -width "available"
37 Logical CPUs belong to this clock modulation domain.
39 Available duty cycle settings for this clock modulation domain.
41 The current duty cycle setting for this clock modulation domain.
42 It could be set to any value listed in
44 The lower duty cycle the more power saving.