CPU(4)                OpenBSD Programmer's Manual (AMD64)               CPU(4)

NAME
     cpu - Central Processing Unit

SYNOPSIS
     cpu0 at mainbus?
     cpu* at mainbus?

DESCRIPTION
     Several processor models have additional features that extend their base
     functionality, such as power and frequency control.

FREQUENCY CONTROL
     The sysctl(3) hw.cpuspeed will return the current operating frequency of
     the processor (on some processors this value may be an approximation).
     If possible, speed may be adjusted by altering hw.setperf from 0 to 100,
     representing percentage of maximum speed.  There is only one possible im-
     plementation for setperf, transparent to the user:

     PowerNow    Found on various AMD processors.  Currently only supports a
                 limited set of models in the K8 families.

SEE ALSO
     sysctl(8)

OpenBSD 4.1                    October 27, 2006                              1
