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),
x86/est(4),
x86/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).