cpufreqd(8)
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 behaviour 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 reinitialization. This has the effect of
needing to send an HUP signal if inserting a new battery, otherwise battery
measurement won't be correct.
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
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.
