Central Processing Unit
cpu0 at mainbus?
cpu* at mainbus?
TABLE OF CONTENTS
Several processor models have additional features that extend their base
functionality, such as power and frequency control or thermal monitoring.
hw.cpuspeed returns the current operating frequency of the processor, though
on some processors this value may be only an approximation. If possible, speed
may be adjusted by altering hw.setperf from 0 to 100, representing percentage
of maximum speed. There are several possible implementations for setperf, all
transparent to the user:
- Enhanced SpeedStep found on Intel and VIA processors, offering frequency
scaling with numerous positions.
- Found on various AMD processors. It currently only supports a limited set
of models in the K8 families.
hw.sensors.cpu*.temp0 returns the current temperature reported by the
Due to the way in which thermal information is reported on Intel processors, the
temperature may be off by exactly +/-15 degrees C.
For multiprocessor kernels with more than one CPU sensor, processors report
identical temperatures since the temperature is taken from the processor
running the sensors update.