Some Power Management

There is some limited support for power management in OpenSolaris 2008.05, but by default it is not enabled (hopefully that will change in a future release).  There is an entry on the BigAdmin wiki page that describes the supported CPUs (from both Intel and AMD) and the simple steps for modifying the /etc/power.conf file.  But this blog entry from Mark Haywood provides quite a bit more information.  In it, he describes the CPU frequency scaling feature in detail. The feature slows the CPU when idle, so that the chip uses less power and generates less heat.

To follow his instructions, all I had to do was enter this at a command line:

   $ pfexec gedit /etc/power.conf

I added two lines to the end of /etc/power.conf:

   cpupm enable
   cpu-threshold 15s

Saved the file and then ran this command:

   $ pmconfig

And now OpenSolaris 2008.05 is happily slowing down my CPU when it is idle. 

Comments:

Excellent info! I will try this out. Will the next release have a UI to enable/disable these options?

Posted by Abraham Tehrani on June 25, 2008 at 09:37 PM GMT #

>Will the next release have a UI to enable/disable these options?

Hopefully so - check out the recent comment that Bart Smaalders just added: http://defect.opensolaris.org/bz/show_bug.cgi?id=1636#c3

Posted by Gregg Sporar on June 26, 2008 at 01:51 PM GMT #

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The Observatory is a blog for users of Oracle Solaris. Tune in here for tips, tricks and more as we explore the Solaris operating system from Oracle.

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