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system/powernowd: Updated for version 1.00

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David Woodfall 2010-05-13 00:41:28 +02:00 committed by David Somero
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61
system/powernowd/README
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@ -1,12 +1,57 @@
Overview:
This is a very simple program that will adjust the speed of your CPU This is a very simple program that will adjust the speed of your CPU
depending on system load. It works as a client of the CPUFreq driver. depending on system load. It works as a client of the CPUFreq driver.
It is designed for use with CPU's supporting AMD's PowerNow power It is designed for use with CPU's supporting AMD's PowerNow power management
management scheme, as it's algorithm works better if there are more scheme, as it's algorithm works better if there are more then two CPU
than two CPU speeds available. (aka, ARM, AMD K6/K7, Via C3, and speeds available. (aka, ARM, AMD K6/K7, Via C3, and Crusoe as opposed to
Crusoe as opposed to traditional Intel and Ultrasparc). traditional Intel and Ultrasparc).
Powernowd uses the userspace governor, which is included in the Slackware This program is essentially a simple client to the CPUFreq sysfs interface.
kernel images. This means that you -need- to be running Linux v2.5 or later that includes
the sysfs interface. This daemon will -not- work with the CPUFreq driver
interface included in Linux v2.4. Feel free to write your own daemon
to support that if you like; you can even use this as a starting point.
If there's enough clamoring for it, then maybe I'll whip up something.
You also need a CPU that supports frequency scaling and supports the CPUFreq
interface. This code has been tested on various AMD and PPC processors
It is not wise to run two concurrent cpu frequency adjusting programs, I have been running this daemon on my AMD laptop for over 2 years with no
for example, cpufreqd and powernowd simultaneously. problems to report, and it's nice that my laptop remains cool unless I'm
really doing something intensive, like watching DivX movies, without me
having to manually intervene and set the speed. I just recently bought an
Apple iBook G3, and powernowd-0.80 worked flawlessly on it right out of
the box.
Features:
This daemon's goal is simplicity and speed. It doesn't try and make
too many decisions for you. That's its beauty, but it may not be what
everyone's looking for. Some of the features this daemon has:
One, simple heuristic to determine CPU load: "user + sys" time.
Ignore "niced" programs (setiathome, itself, etc). In my mind this is
consistent with what is meant when someone 'nice's a program to begin
with. (configurable in v0.85+) Designed for CPU's that support more
then two speed states, but works well with anything. Very fast, low
overhead /proc/stat gathering (method stolen from procps). Supports SMP
Will automatically switch to 'userspace' governor. Care taken to make
the code non-root exploitable (but please audit for yourself first!)
Frequency step size is configurable (default to 100MHz/step) 4 different
behavioral modes to choose from (SINE, AGGRESSIVE, PASSIVE, LEAPS),
which determine the behavior when the load changes. Configurable from the
command line. Written in C for speed and simplicity. Logging to stdout
or syslog Configurable Polling frequency in milliseconds (defaults to 1s)
Configurable highwater/lowwater marks for CPU usage. (defaults 80/20%)
Many similar daemons use other methods to determine what speed to use,
such as battery status, AC status, temperature, fan status, etc. They all
have their place. I however feel that in the grand scheme of things none
of the above matters. When I'm not using my CPU, I don't care if it's
running at a slower speed. When I -am- using my CPU, I only need it to
be fast enough to handle the task at hand without hiccuping. And when I'm
taxing my CPU, I want it running full speed. That's all this daemon does,
monitor CPU load and adjust the speed accordingly. Since in all reality
my CPU is idle 99% of the time (or playing mp3's which it can easily do
at it's lowest speed rating), this by definition leads to low power usage,
low temperatures, low speed fans, and better battery life.

22
system/powernowd/doinst.sh
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@ -1,22 +0,0 @@
config() {
NEW="$1"
OLD="$(dirname $NEW)/$(basename $NEW .new)"
# If there's no config file by that name, mv it over:
if [ ! -r $OLD ]; then
mv $NEW $OLD
elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then
# toss the redundant copy
rm $NEW
fi
# Otherwise, we leave the .new copy for the admin to consider...
}
# Keep same perms on rc.powernowd.new:
if [ -e etc/rc.d/rc.powernowd ]; then
cp -a etc/rc.d/rc.powernowd etc/rc.d/rc.powernowd.new.incoming
cat etc/rc.d/rc.powernowd.new > etc/rc.d/rc.powernowd.new.incoming
mv etc/rc.d/rc.powernowd.new.incoming etc/rc.d/rc.powernowd.new
fi
config etc/rc.d/rc.powernowd.new

108
system/powernowd/powernowd.1
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@ -1,108 +0,0 @@
.\" 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).

36
system/powernowd/powernowd.SlackBuild
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@ -2,7 +2,7 @@
# Slackware build script for powernowd # Slackware build script for powernowd
# Written by Daniel LEVAI leva@ecentrum.hu # Written by David Woodfall info@davidwoodfall.co.uk
PRGNAM=powernowd PRGNAM=powernowd
VERSION=${VERSION:-1.00} VERSION=${VERSION:-1.00}
@ -17,16 +17,19 @@ OUTPUT=${OUTPUT:-/tmp}
if [ "$ARCH" = "i486" ]; then if [ "$ARCH" = "i486" ]; then
SLKCFLAGS="-O2 -march=i486 -mtune=i686" SLKCFLAGS="-O2 -march=i486 -mtune=i686"
LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then elif [ "$ARCH" = "i686" ]; then
SLKCFLAGS="-O2 -march=i686 -mtune=i686" SLKCFLAGS="-O2 -march=i686 -mtune=i686"
LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then elif [ "$ARCH" = "x86_64" ]; then
SLKCFLAGS="-O2 -fPIC" SLKCFLAGS="-O2 -fPIC"
LIBDIRSUFFIX="64"
fi fi
set -e # Exit on most errors set -e
rm -rf $PKG rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT mkdir -p $TMP $OUTPUT $PKG/usr/sbin
cd $TMP cd $TMP
rm -rf $PRGNAM-$VERSION rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
@ -38,28 +41,25 @@ find . \
\( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \ \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
-exec chmod 644 {} \; -exec chmod 644 {} \;
# We'll do all of this manually make
gcc $SLKCFLAGS -Wall -o powernowd powernowd.c install -m 755 powernowd $PKG/usr/sbin
mkdir -p $PKG/usr/sbin ( cd $PKG
strip --strip-unneeded powernowd find . | xargs file | grep "executable" | grep ELF | cut -f 1 -d : | \
install -m 755 powernowd $PKG/usr/sbin/ xargs strip --strip-unneeded 2> /dev/null || true
find . | xargs file | grep "shared object" | grep ELF | cut -f 1 -d : | \
mkdir -p $PKG/etc/rc.d/ xargs strip --strip-unneeded 2> /dev/null || true
cat $CWD/rc.powernowd.new > $PKG/etc/rc.d/rc.powernowd.new )
mkdir -p $PKG/usr/man/man1
gzip -9c $CWD/powernowd.1 > $PKG/usr/man/man1/powernowd.1.gz
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \ cp -a \
README \ powernowd.init \
$PKG/usr/doc/$PRGNAM-$VERSION $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
mkdir -p $PKG/install mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc cat $CWD/slack-desc > $PKG/install/slack-desc
cat $CWD/doinst.sh > $PKG/install/doinst.sh
cd $PKG cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.tgz /sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}

12
system/powernowd/powernowd.info
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@ -1,8 +1,10 @@
PRGNAM="powernowd" PRGNAM="powernowd"
VERSION="1.00" VERSION="1.00"
HOMEPAGE="http://deater.net/john/powernowd.html" HOMEPAGE="http://www.deater.net/john/powernowd.html"
DOWNLOAD="http://deater.net/john/powernowd-1.00.tar.gz" DOWNLOAD="http://www.deater.net/john/powernowd-1.00.tar.gz"
MD5SUM="abc48b690d104e9e71a85400ba19d799" MD5SUM="abc48b690d104e9e71a85400ba19d799"
MAINTAINER="Daniel LEVAI" DOWNLOAD_x86_64=""
EMAIL="leva@ecentrum.hu" MD5SUM_x86_64=""
APPROVED="rworkman" MAINTAINER="David Woodfall"
EMAIL="info@davidwoodfall.co.uk"
APPROVED="dsomero"

54
system/powernowd/rc.powernowd.new
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@ -1,54 +0,0 @@
#!/bin/sh
# Written by Daniel LEVAI for the Slackware package
# Modified by Robby Workman <rworkman@slackbuilds.org>
# For the options, see the README of the man page
#OPTS='-q'
powernowd_start() {
local PID=$(pgrep -x powernowd);
if [ $PID ];then
echo "powernowd is already running ($PID)"
exit 1
else
/usr/sbin/powernowd $OPTS
fi
}
powernowd_stop() {
local PID=$(pgrep -x powernowd);
if [ -z $PID ];then
echo "powernowd is not running"
exit 1
else
local i=1
while pgrep -x powernowd > /dev/null;do
if [ $i -gt 3 ];then
echo "Couldn't stop powernowd..."
exit 1
fi
pkill -x powernowd
i=$(( $i + 1 ));
sleep 1;
done
fi
}
case "$1" in
start)
powernowd_start
;;
stop)
powernowd_stop
;;
restart)
powernowd_stop
sleep 1
powernowd_start
;;
*)
echo "$0 <start|stop|restart>"
;;
esac

14
system/powernowd/slack-desc
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@ -5,15 +5,15 @@
# make exactly 11 lines for the formatting to be correct. It's also # make exactly 11 lines for the formatting to be correct. It's also
# customary to leave one space after the ':'. # customary to leave one space after the ':'.
|-----handy-ruler-------------------------------------------------------| |-----handy-ruler------------------------------------------------------|
powernowd: This is a very simple program that will adjust the speed of your CPU powernowd: powernowd (a cpu frequency daemon)
powernowd:
powernowd: This is a very simple program that will adjust the speed of your CPU
powernowd: depending on system load. It works as a client of the CPUFreq driver. powernowd: depending on system load. It works as a client of the CPUFreq driver.
powernowd: It is designed for use with CPU's supporting AMD's PowerNow power powernowd: It is designed for use with CPU's supporting AMD's PowerNow power
powernowd: management scheme, as it's algorithm works better if there are more powernowd: management scheme, as it's algorithm works better if there are more
powernowd: then two CPU speeds available. (aka, ARM, AMD K6/K7, Via C3, and powernowd: then two CPU speeds available. (aka, ARM, AMD K6/K7, Via C3, and
powernowd: Crusoe as opposed to traditional Intel and Ultrasparc). powernowd: Crusoe as opposed to traditional Intel and Ultrasparc).
powernowd: powernowd:
powernowd: http://deater.net/john/powernowd.html
powernowd:
powernowd: powernowd:
powernowd: powernowd: