openbsd cpufreq

[jaideep_jdof]

does openbsd 4.4 support cpufreq, and if yes how to enable it.

[Oko]

Originally Posted by jaideep_jdof

does openbsd 4.4 support cpufreq, and if yes how to enable it.

man apmd

[BSDfan666]

Changing the processor speed manually can be done via the hw.setperf knob in sysctl(8). (On supported systems..)

But Oko is correct, apmd(8) is the way to do this automatically.. but unless you're using a laptop, it's not really necessary.

[jaideep_jdof]

Is there a tutorial or a guide for this, is this daemon already running or do i have to enable this.

[jggimi]

There is not an official tutorial or FAQ specific to apmd authored by the OpenBSD Project.

The apmd daemon is one of the many daemons that may be started automatically at boot time by the /etc/rc system, with variables controlled by /etc/rc.conf and /etc/rc.conf.local. If you look in /etc/rc.conf, you will see:

apmd_flags=NO        # for normal use: ""

Because the /etc/rc.conf file changes from release to release, the best practice is to put local settings in /etc/rc.conf.local. My laptop has this in /etc/rc.conf.local:

apmd_flags="-A"        # auto management by default on this system

For more information, see FAQ 10.3 and rc.conf(8).

[jaideep_jdof]

which one is better apmd_flags="-A" or apmd_flags="-C", -C seems to have more features.

[jggimi]

First, your system needs to be able to control CPU speed ... sysctl hw.setperf must exist on it.

Then, if you read the descriptions in the man page, you can pick what's best for your own situation. The main difference between the "automatic" and "cool running" settings is external power and battery management.