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.\" Copyright 2002-2003, George Staikos (staikos@0wned.org)
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.\" Mattia Dongili (dongili@supereva.it)
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.\" Copyright 2002-2005, George Staikos (staikos@0wned.org)
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.\" Mattia Dongili (malattia@linux.it)
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.\" Rene Rebe (rene@rocklinux.org)
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.\" This file may be used subject to the terms and conditions of the
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.\" GNU General Public License Version 2, or any later version
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details."
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.TH CPUFREQD 8 "25 Mar 2003" "" ""
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.TH CPUFREQD 8 "05 May 2005" "" ""
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cpufreqd \- intelligently monitor and manipulate CPU frequency
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.B "cpufreqd [-Dhv] [-f filename] [-V verbosity]"
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.B "cpufreqd [-Dmhv] [-f filename] [-V verbosity]"
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is used to monitor the status of the battery and adjust the frequency of the
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CPU accordingly in order to preserve battery power while providing optimal
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performance. The behaviour of the daemon is fully configurable. Logs are reported through syslogd.
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is used to monitor the status of the system and adjust the frequency of the
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CPU according to the user configuration. The behaviour of the daemon is fully
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configurable. Logs are reported through syslogd.
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.B "-D, --no-daemon"
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stay in foreground (used to debug).
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.B "-f filename, --file=filename"
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Specify the configuration file to read. The default is /etc/cpufreqd.conf.
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Specify the configuration file to read. The default is
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Display command line help.
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perform a re-initialization. The configuration file (default is /etc/cpufreqd.conf) will be re-read and probes re-done.
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perform a re-initialization. The configuration file (default is
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/etc/cpufreqd.conf) will be re-read and probes re-done. (Not
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yet implemented in cpufreqd-2.0)
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/usr/sbin/cpufreqd \-D
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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.
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Some ACPI implementations are very cpu-consuming when reading the info file of
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system batteries. Cpufreqd implements a simple workaround that avoids reading
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that file except on initialization or reinitialization. This has the effect of
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needing to send an HUP signal if inserting a new battery, otherwise battery
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measurement won't be correct.
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.I /sys/devices/system/cpu/cpu*/cpufreq
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2.6 kernel cpu frequency interface
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kernel cpu frequency interface
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2.4 kernel cpu frequency interface
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old deprecated kernel cpu frequency interface (please avoid it)
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kernel power management interface (ACPI)
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kernel power management interface (APM)
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kernel power management interface (ACPI)
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kernel power management interface (PMU)
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kernel power management interface (PMU). (Not yet implemented in cpufreqd-2.0)
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.I /etc/cpufreqd.conf
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.BR cpufreqd.conf (5), syslogd (8)
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.BR cpufreqd.conf (5), syslogd (8), cpufreqd-set (1), cpufreqd-get (1)
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Multiple CPUs are not supported.
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Multiple CPUs are not considered separately thus the same policy is set in every
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Battery can only be specified in percent, not in minutes remaining.
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George Staikos <staikos@0wned.org>
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Mattia Dongili <dongili@supereva.it>
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Mattia Dongili <malattia@linux.it>
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Rene Rebe <rene@rocklinux.org>