ODCM(4) | Device Drivers Manual (x86) | ODCM(4) |
odcm
— On-demand
Clock Modulation
odcm0 at cpu0
The odcm
driver provides support for
changing the duty cycle of a CPU. This is sometimes known as
“on-demand clock modulation” (ODCM). Refer to
acpicpu(4) for additional
details about ODCM.
The following
sysctl(8) variables are
available with odcm
:
machdep.clockmod.target
machdep.clockmod.current
machdep.clockmod.available
Note that some errata may limit the availability of some duty cycles.
ODCM is meant for short-term thermal management, not power management. There is usually no reason for a system administrator to change the values manually. Lowering the duty cycle may dramatically decrease performance and responsiveness of the system.
February 17, 2017 | NetBSD 10.99 |