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authorDaniel LEVAI <leva@ecentrum.hu>2010-05-12 23:33:46 +0200
committerRobby Workman <rworkman@slackbuilds.org>2010-05-12 23:33:46 +0200
commit84c1b62f41c085e6fd8edc44766b45b7f894f277 (patch)
tree875009b1d132620e184c3be503567b30f33643f5 /system/powernowd/powernowd.1
parent9e6923f009ca94403b6ee172b7fca3408e085ae9 (diff)
system/powernowd: Added to 12.2 repository
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+.\" Hey, EMACS: -*- nroff -*-
+.\" First parameter, NAME, should be all caps
+.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
+.\" other parameters are allowed: see man(7), man(1)
+.TH POWERNOWD 1 "November 3, 2003"
+.\" Please adjust this date whenever revising the manpage.
+.\"
+.\" Some roff macros, for reference:
+.\" .nh disable hyphenation
+.\" .hy enable hyphenation
+.\" .ad l left justify
+.\" .ad b justify to both left and right margins
+.\" .nf disable filling
+.\" .fi enable filling
+.\" .br insert line break
+.\" .sp <n> insert n+1 empty lines
+.\" for manpage-specific macros, see man(7)
+.SH NAME
+powernowd \- control the speed and voltage of cpus
+.SH SYNOPSIS
+.B powernowd
+.RI [ options ]
+.SH DESCRIPTION
+This is a simple client to the cpufreq driver, and uses the sysfs interface
+in Linux kernel version 2.6. You need a supported cpu, and a
+kernel that supports sysfs to run this daemon.
+
+The name is somewhat misleading, as any processor supported by the kernel
+cpufreq driver will work, not just processors supporting AMD's
+PowerNow! technology. This daemon works best with processors that support
+more then 2 frequency steps, like those with AMD's PowerNow!, and Intel's
+Pentium M family.
+.SH OPTIONS
+.TP
+.B \-h
+Prints a help message.
+.TP
+.B \-d
+Don't detach from terminal (default is to detach and run in the background)
+.TP
+.B \-v
+Increase output verbosity, can be used more than once.
+.TP
+.B \-q
+Quiet mode, only emergency output.
+.TP
+.B \-n
+Include nice'd processes in calculations.
+.TP
+.B \-m
+Modes of operation, 0 = SINE, 1 = AGGRESSIVE (default), 2 = PASSIVE, 3 = LEAPS
+.TP
+.B \-s
+Frequency step in kHz (default = 100000)
+.TP
+.B \-p
+Polling frequency in msecs (default = 1000)
+.TP
+.B \-u
+CPU usage upper limit percentage [0 .. 100, default 80]
+.TP
+.B \-l
+CPU usage lower limit percentage [0 .. 100, default 20]
+.SH MODES
+There are 4 modes supported by this client:
+
+Mode 0, SINE, changes the frequency as a sine wave function, raising the
+frequency by "step" Hz every time the CPU usage goes over 80%,
+and decreases it by "step" Hz when the CPU usage falls under 20%.
+
+Mode 1, AGGRESSIVE, changes frequency by a sawtooth function.
+Immediately jumps to the highest frequency whenever CPU usage goes
+over 80%, and decreases by "step" Hz as usage drops below
+20%. This is the default behavior.
+
+Mode 2, PASSIVE, is the inverse of AGGRESSIVE.
+Immediately jump to lowest frequency when usage drops below 20%.
+Raise by "step" Hz if it goes above 80%.
+
+Mode 3, LEAPS, immediately jumps to the highest frequency if usage is above
+80%, and immediately jumps to the lowest frequency if usage is below 20%.
+.SH PHILOSOPHY
+Why another CPUFreq client daemon?
+
+Some other daemons are better suited for two speed states, and
+toggle between two states based upon load. This daemon does a better job
+handling intermediate steps.
+
+Other daemons are written in Perl, Python, or C++. This is a simple C
+program.
+
+Some other daemons rely on APM or ACPI.
+The sysfs interface to the 2.6
+kernel is simple, completely sufficient, and completely portable to all
+architectures that support the CPUfreq support in the kernel.
+
+Some other daemons change thier behavior based upon battery status, AC
+status, temperature, etc. What good is having a nice powerful laptop if
+you can't use it at full speed, even for a few seconds, while on battery
+power? This daemon just measures CPU load, and bases decisions solely
+upon that.
+
+SMP systems are supported, making this daemon useful for servers, too!
+.SH AUTHOR
+The powernowd program was written by John Clemens <clemej@alum.rpi.edu>
+
+This manual page was written by Bdale Garbee <bdale@gag.com>,
+for the Debian project (but may be used by others).