NAME

powernow — AMD PowerNow! and Cool'n'Quiet

SYNOPSIS

powernow0 at cpu0

DESCRIPTION

The powernow driver supports AMD “PowerNow!” and “Cool'n'Quiet” CPU frequency scaling technologies. The following sysctl(8) variables are available with powernow:

machdep.powernow.frequency.target

The target frequency of the CPUs.

machdep.powernow.frequency.current

The current frequency.

machdep.powernow.frequency.available

The available frequencies.

Note, however, that these variables are not guaranteed to exist in the future versions of NetBSD.

SEE ALSO

acpicpu(4), est(4), odcm(4)

CAVEATS

The powernow driver is considered a legacy interface to be used only with relatively old systems. The driver supports only AMD processor families K7 (for instance, Duron, Athlon, and some Semprons) and K8 (namely, the early 64-bit family, including Athlon 64, Opteron, and Turion).