[geeks] solaris x86 cpu speed control

[Patrick Giagnocavo]

On 12/25/2010 2:27 AM, Shannon wrote:
> Question:
> 
> I would like to have my Solaris server put the CPU cores in their slowest
> possible state at nite and other times to reduce power use and (mostly)
> noise.
> 
> This is an AMD system that can vary from 1-3GHz speeds in several steps.
> 
> At 1GHz, you can barely hear it run, so I'd like some way to force it to run
> that slow, even if there are jobs active that would normally force stepping
> control to run the CPU fast.

Yes, they started adding this in 2007.

See:

http://blogs.sun.com/mhaywood/entry/introducing_speedstep_on_solaris

OpenSolaris info:

http://hub.opensolaris.org/bin/view/Community+Group+pm/FAQ_cpupm_support

Looks like it depends on your CPU, version of Solaris, etc. as to how
much control you have.

--Patrick