LONGRUN(4) BSD/i386 Kernel Interfaces Manual LONGRUN(4)NAME
longrun -- Transmeta(TM) Crusoe(TM) LongRun(TM) support
SYNOPSIS
LongRun support is a collection of power saving modes for the Transmeta Crusoe chips, similar in scope to Intel's SpeedStep. The following
sysctl(8) MIBs control the different CPU modes:
Name Type Changeable Description
hw.crusoe.longrun integer yes LongRun mode:
0: minimum frequency mode
1: power-saving mode
2: performance mode
3: maximum frequency mode
hw.crusoe.frequency integer no Current frequency (MHz).
hw.crusoe.voltage integer no Current voltage (mV).
hw.crusoe.percentage integer no Processing performance (%).
EXAMPLES
Print the current status:
% sysctl hw.crusoe
To set LongRun mode to performance oriented variable frequency mode (less power savings):
# sysctl hw.crusoe.longrun=2
HISTORY
The Transmeta(TM) Crusoe(TM) LongRun(TM) support first appeared in FreeBSD 4.4.
AUTHORS
LongRun support and this manual page were written by Tamotsu HATTORI <athlete@kta.att.ne.jp> and Mitsuru IWASAKI <iwasaki@FreeBSD.org>.
BSD June 30, 2001 BSD
Check Out this Related Man Page
PIIXPCIB(4) BSD Kernel Interfaces Manual PIIXPCIB(4)NAME
piixpcib -- Intel PIIX4 PCI-ISA bridge with SpeedStep
SYNOPSIS
piixpcib* at pci? dev ? function ?
isa* at piixpcib?
DESCRIPTION
The piixpcib driver provides support for the Intel PIIX and compatible PCI-ISA Bridges with Intel's first generation SpeedStep.
Frequency scaling is supported on Pentium III with two voltage modes, used by SpeedStep as power states low and high. The driver will switch
into low power state by reducing voltage and frequency of the CPU. The factor depends on the processor itself, but will always reduce power
consumption about 1/2.
The user can manually control the CPU frequency with the sysctl(8) program using the following node:
machdep.speedstep_state = [0/1]
SEE ALSO est(4), isa(4), pci(4), apmd(8), sysctl(8)HISTORY
The piixpcib driver first appeared in FreeBSD 5.5 and then in NetBSD 4.0.
AUTHORS
The current piixpcib driver was written by Bruno Ducrot. It was ported to NetBSD by Jared D. McNeill <jmcneill@NetBSD.org>.
BSD March 1, 2011 BSD
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