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108 lines
3.7 KiB
Groff
108 lines
3.7 KiB
Groff
.\" Hey, EMACS: -*- nroff -*-
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.\" First parameter, NAME, should be all caps
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.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
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.\" other parameters are allowed: see man(7), man(1)
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.TH POWERNOWD 1 "November 3, 2003"
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.\" Please adjust this date whenever revising the manpage.
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.\"
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.\" Some roff macros, for reference:
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.\" for manpage-specific macros, see man(7)
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.SH NAME
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powernowd \- control the speed and voltage of cpus
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.SH SYNOPSIS
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.B powernowd
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.RI [ options ]
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.SH DESCRIPTION
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This is a simple client to the cpufreq driver, and uses the sysfs interface
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in Linux kernel version 2.6. You need a supported cpu, and a
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kernel that supports sysfs to run this daemon.
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The name is somewhat misleading, as any processor supported by the kernel
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cpufreq driver will work, not just processors supporting AMD's
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PowerNow! technology. This daemon works best with processors that support
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more then 2 frequency steps, like those with AMD's PowerNow!, and Intel's
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Pentium M family.
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.SH OPTIONS
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.TP
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.B \-h
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Prints a help message.
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.TP
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.B \-d
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Don't detach from terminal (default is to detach and run in the background)
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.TP
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.B \-v
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Increase output verbosity, can be used more than once.
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.TP
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.B \-q
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Quiet mode, only emergency output.
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.TP
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.B \-n
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Include nice'd processes in calculations.
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.TP
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.B \-m
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Modes of operation, 0 = SINE, 1 = AGGRESSIVE (default), 2 = PASSIVE, 3 = LEAPS
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.TP
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.B \-s
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Frequency step in kHz (default = 100000)
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.TP
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.B \-p
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Polling frequency in msecs (default = 1000)
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.TP
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.B \-u
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CPU usage upper limit percentage [0 .. 100, default 80]
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.TP
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.B \-l
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CPU usage lower limit percentage [0 .. 100, default 20]
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.SH MODES
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There are 4 modes supported by this client:
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Mode 0, SINE, changes the frequency as a sine wave function, raising the
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frequency by "step" Hz every time the CPU usage goes over 80%,
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and decreases it by "step" Hz when the CPU usage falls under 20%.
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Mode 1, AGGRESSIVE, changes frequency by a sawtooth function.
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Immediately jumps to the highest frequency whenever CPU usage goes
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over 80%, and decreases by "step" Hz as usage drops below
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20%. This is the default behavior.
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Mode 2, PASSIVE, is the inverse of AGGRESSIVE.
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Immediately jump to lowest frequency when usage drops below 20%.
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Raise by "step" Hz if it goes above 80%.
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Mode 3, LEAPS, immediately jumps to the highest frequency if usage is above
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80%, and immediately jumps to the lowest frequency if usage is below 20%.
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.SH PHILOSOPHY
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Why another CPUFreq client daemon?
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Some other daemons are better suited for two speed states, and
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toggle between two states based upon load. This daemon does a better job
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handling intermediate steps.
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Other daemons are written in Perl, Python, or C++. This is a simple C
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program.
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Some other daemons rely on APM or ACPI.
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The sysfs interface to the 2.6
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kernel is simple, completely sufficient, and completely portable to all
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architectures that support the CPUfreq support in the kernel.
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Some other daemons change thier behavior based upon battery status, AC
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status, temperature, etc. What good is having a nice powerful laptop if
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you can't use it at full speed, even for a few seconds, while on battery
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power? This daemon just measures CPU load, and bases decisions solely
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upon that.
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SMP systems are supported, making this daemon useful for servers, too!
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.SH AUTHOR
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The powernowd program was written by John Clemens <clemej@alum.rpi.edu>
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This manual page was written by Bdale Garbee <bdale@gag.com>,
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for the Debian project (but may be used by others).
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