CPUFREQD(8) CPUFREQD(8)
NAME
cpufreqd - intelligently monitor and manipulate CPU frequency
SYNOPSIS
cpufreqd [-Dmhv] [-f filename] [-V verbosity]
DESCRIPTION
cpufreqd is used to monitor the status of the system and adjust the frequency of the CPU according to the user configuration. The behav-
iour of the daemon is fully configurable. Logs are reported through syslogd.
PARAMETERS
-D, --no-daemon
stay in foreground (used to debug).
-m, --manual
start in manual mode.
-f filename, --file=filename
Specify the configuration file to read. The default is /etc/cpufreqd.conf.
-h, --help
Display command line help.
-v, --version
Display the version number of the daemon.
-V, --verbosity
verbosity level from 0 (less verbose) to 7 (most verbose). Default verbosity is 4
SIGNALS
SIGHUP This lets cpufreqd perform a re-initialization. The configuration file (default is /etc/cpufreqd.conf) will be re-read and probes
re-done. (Not yet implemented in cpufreqd-2.0)
SIGINT, SIGTERM
cpufreqd will terminate.
EXAMPLES
/usr/sbin/cpufreqd -D
NOTES
Some ACPI implementations are very cpu-consuming when reading the info file of
system batteries. Cpufreqd implements a simple workaround that avoids reading that file except on initialization or reinitializa-
tion. This has the effect of needing to send an HUP signal if inserting a new battery, otherwise battery measurement won't be cor-
rect.
FILES
/sys/devices/system/cpu/cpu*/cpufreq
kernel cpu frequency interface
/proc/cpufreq
old deprecated kernel cpu frequency interface (please avoid it)
/proc/acpi
kernel power management interface (ACPI)
/proc/apm
kernel power management interface (APM)
/proc/pmu
kernel power management interface (PMU). (Not yet implemented in cpufreqd-2.0)
/etc/cpufreqd.conf
cpufreqd configuration file
SEE ALSO
cpufreqd.conf(5),syslogd(8),cpufreqd-set(1),cpufreqd-get(1)
BUGS
Multiple CPUs are not considered separately thus the same policy is set in every available CPU. Battery can only be specified in percent,
not in minutes remaining.
AUTHOR
George Staikos <staikos@0wned.org>
Mattia Dongili <malattia@linux.it>
Rene Rebe <rene@rocklinux.org>
05 May 2005 CPUFREQD(8)