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ODCM(4) NetBSD Kernel Interfaces Manual ODCM(4)
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Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
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 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.
acpicpu(4), x86/est(4), x86/powernow(4)
ODCM is meant for short-term thermal management, not power management.
There is usually no reason for a system administrator to change the val-
ues manually. Lowering the duty cycle may dramatically decrease perfor-
mance and responsiveness of the system.
NetBSD 9.1 February 17, 2017 NetBSD 9.1