diff options
Diffstat (limited to 'system/powernowd/powernowd.1')
| -rw-r--r-- | system/powernowd/powernowd.1 | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/system/powernowd/powernowd.1 b/system/powernowd/powernowd.1 new file mode 100644 index 000000000000..232c990f8dfd --- /dev/null +++ b/system/powernowd/powernowd.1 @@ -0,0 +1,108 @@ +.\" 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). |