acpicpu —
ACPI processor power and performance state
acpicpu* at acpi?
The
acpicpu driver provides support for
extracting processor power and performance levels from ACPI tables. This
information is used to enter deeper CPU power states when idle, and can be
used to throttle processor speed to reduce power usage and extend battery life
through the
hw.setperf
sysctl(2) mechanism.
sysctl(2),
acpi(4),
cpu(4),
intro(4),
apmd(8),
sysctl(8)
The
acpicpu driver first appeared in
OpenBSD 3.9.
The
acpicpu driver was written by
Marco Peereboom
<
marco@openbsd.org>.
CPU power state (C-state) support was added by
Philip Guenther
<
guenther@openbsd.org>.
![[OpenBSD]](/openbsd.gif){kind=small}