mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-18 10:35:55 +00:00
139 lines
3.8 KiB
Groff
139 lines
3.8 KiB
Groff
.\" Copyright (c) 2005 Nate Lawson
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd November 6, 2005
|
|
.Dt POWERD 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm powerd
|
|
.Nd "system power control utility"
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl a Ar mode
|
|
.Op Fl b Ar mode
|
|
.Op Fl i Ar percent
|
|
.Op Fl n Ar mode
|
|
.Op Fl p Ar ival
|
|
.Op Fl P Ar pidfile
|
|
.Op Fl r Ar percent
|
|
.Op Fl v
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility monitors the system state and sets various power control options
|
|
accordingly.
|
|
It offers three modes (maximum, minimum, and adaptive) that can be
|
|
individually selected while on AC power or batteries.
|
|
.Pp
|
|
Maximum mode chooses the highest performance values.
|
|
Minimum mode selects the lowest performance values to get the most power
|
|
savings.
|
|
Adaptive mode attempts to strike a balance by degrading performance when
|
|
the system appears idle and increasing it when the system is busy.
|
|
It offers a good balance between a small performance loss for greatly
|
|
increased power savings.
|
|
The default mode is
|
|
adaptive.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
utility recognizes the following runtime options:
|
|
.Bl -tag -width ".Fl r Ar percent"
|
|
.It Fl a Ar mode
|
|
Selects the
|
|
.Ar mode
|
|
to use while on AC power.
|
|
.It Fl b Ar mode
|
|
Selects the
|
|
.Ar mode
|
|
to use while on battery power.
|
|
.It Fl i Ar percent
|
|
Specifies the CPU idle percent level when
|
|
adaptive
|
|
mode should begin to degrade performance to save power.
|
|
The default is 90% or higher.
|
|
.It Fl n Ar mode
|
|
Selects the
|
|
.Ar mode
|
|
to use normally when the AC line state is unknown.
|
|
.It Fl p Ar ival
|
|
Specifies a different polling interval (in milliseconds) for AC line state
|
|
and system idle levels.
|
|
The default is 500 ms.
|
|
.It Fl P Ar pidfile
|
|
Specifies an alternative file in which the process ID should be stored.
|
|
The default is
|
|
.Pa /var/run/powerd.pid .
|
|
.It Fl r Ar percent
|
|
Specifies the CPU idle percent level where
|
|
adaptive
|
|
mode should consider the CPU running and increase performance.
|
|
The default is 65% or lower.
|
|
.It Fl v
|
|
Verbose mode.
|
|
Messages about power changes will be printed to stdout and
|
|
.Nm
|
|
will operate in the foreground.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr acpi 4 ,
|
|
.Xr apm 4 ,
|
|
.Xr cpufreq 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
utility first appeared in
|
|
.Fx 6.0 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
.An Colin Percival
|
|
first wrote
|
|
.Nm estctrl ,
|
|
the utility that
|
|
.Nm
|
|
is based on.
|
|
.An Nate Lawson
|
|
then updated it for
|
|
.Xr cpufreq 4 ,
|
|
added features, and wrote this manual page.
|
|
.Sh BUGS
|
|
The
|
|
.Nm
|
|
utility should also power down idle disks and other components besides the CPU.
|
|
.Pp
|
|
If
|
|
.Nm
|
|
is used with
|
|
.Pa power_profile ,
|
|
they may override each other.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
utility
|
|
should probably use the
|
|
.Xr devctl 4
|
|
interface instead of polling for AC line state.
|