NAME
odcm —
On-demand Clock Modulation
SYNOPSIS
odcm0 at cpu0
DESCRIPTION
Theodcm 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- The target duty cycle of all CPUs. The values range from 7 (100 %) to 0 (approximately 13 %).
machdep.clockmod.current- The current duty cycle of CPUs.
machdep.clockmod.available- A list of available duty cycles.
Note that some errata may limit the availability of some duty cycles.
SEE ALSO
CAVEATS
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.