Improve frequency scaling-related manual pages
[dragonfly.git] / usr.sbin / powerd / powerd.8
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1.\" (c) Copyright 2010 by Matthew Dillon and Dima Ruban. Permission to
2.\" use and distribute based on the DragonFly copyright.
3.\"
e9c04a6f 4.Dd October 10, 2014
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5.Dt POWERD 8
6.Os
7.Sh NAME
8.Nm powerd
a5c360eb 9.Nd simple ACPI based CPU/power control
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10.Sh SYNOPSIS
11.Nm
12.Op Fl d
13.Sh DESCRIPTION
14The
15.Nm
a5c360eb 16daemon monitors the CPU load and automatically adjusts the CPU
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17frequency up or down.
18.Pp
a5c360eb 19All CPUs will be set to their maximum frequency when the 1 second
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20machine load exceeds 25% of one CPU.
21All CPUs will be set to their
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22minimum frequency when the 10 second machine load drops below 12% of
23one CPU.
24.Pp
25The options are as follows:
26.Bl -tag -width Fl
27.It Fl d
28Debug option.
29Causes
30.Nm
31to not go to the background and prints some debug output to
32.Va stdout .
3defbedf 33.El
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34.Sh DIAGNOSTICS
35The
36.Nm
37utility will exit with a non-zero code if the required sysctls are not
38present.
39.Sh SEE ALSO
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40.Xr acpi 4 ,
41.Xr est 4 ,
42.Xr powernow 4
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43.Sh HISTORY
44The
45.Nm
46command first appeared in
a5c360eb 47.Dx 2.7 .
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48.Sh BUGS
49I'm shocked I tell you, shocked that there might be bugs in this program!