cpu man page on OpenBSD

Man page or keyword search:  
man Server   11362 pages
apropos Keyword Search (all sections)
Output format
OpenBSD logo
[printable version]

CPU(4)		      OpenBSD Programmer's Manual (i386)		CPU(4)

NAME
     cpu - Central Processing Unit

SYNOPSIS
     cpu0 at mainbus?
     cpu* at mainbus?

DESCRIPTION
     Several processor models have additional features that extend their base
     functionality, such as power and frequency control or thermal monitoring.

FREQUENCY CONTROL
     The sysctl(3) hw.cpuspeed will return the current operating frequency of
     the processor (on some processors this value may be 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.	In systems
     with more than one control capability, they are preferred in the order
     given.

     LongRun	 Found on Transmeta Crusoe processors, offers frequency
		 scaling with numerous positions.  The processor dynamically
		 adjusts frequency in response to load, the setperf value is
		 interpreted as the maximum.

     EST	 Enhanced SpeedStep found on Intel Pentium M processors,
		 offers frequency scaling with numerous positions.

     SpeedStep	 Found on some Intel Pentium 3 and newer mobile chips, it is
		 capable of adjusting frequency between a low and high value.
		 Only enabled on some chipsets.

     TCC	 Thermal Control Circuit found on Intel Pentium 4 and newer
		 processors, adjusts processor duty cycle in 12.5 percent
		 increments.

     PowerNow	 Found on various AMD processors.  Currently only supports a
		 limited set of models in the K6, K7, and K8 families.

INSTRUCTION SET EXTENSIONS
     The presence of extended instruction sets can be determined by sysctl
     machdep.

     osfxsr	 Supports the fxsave instruction.

     sse	 Supports the SSE instruction set.

     sse2	 Supports the SSE2 instruction set.

     xcrypt	 Support the VIA AES encryption instruction set.  If this is
		 supported, the libcrypto EVP AES functions will automatically
		 use this support.

THERMAL MONITORING
     The sysctl(3) hw.sensors.cpu*.temp0 will return the current temperature
     reported by the processor.

SEE ALSO
     sysctl(8)

BUGS
     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 will
     report identical temperatures since the temperature is taken from the
     processor running the sensors update.

OpenBSD 4.9			 July 13, 2009			   OpenBSD 4.9
[top]

List of man pages available for OpenBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net