odcm(4) - NetBSD Manual Pages

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ODCM(4)                 NetBSD Kernel Interfaces Manual                ODCM(4)


NAME
odcm -- On-demand Clock Modulation
SYNOPSIS
odcm0 at cpu0
DESCRIPTION
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.
SEE ALSO
acpicpu(4), x86/est(4), x86/powernow(4)
CAVEATS
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
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