Re: cpu power "management" for non-dfs chips with no pmu (for instance, 750cxe and mpc7447 in pegasos)

From: Jon Loeliger <jdl@jdl•com>
To: matt@genesi-usa•com
Cc: linuxppc-dev@ozlabs•org
Subject: Re: cpu power "management" for non-dfs chips with no pmu (for instance, 750cxe and mpc7447 in pegasos)
Date: Fri, 23 Jun 2006 09:26:57 -0500	[thread overview]
Message-ID: <E1Ftmcb-0007rG-QS@jdl.com> (raw)
In-Reply-To: Your message of "Fri, 23 Jun 2006 08:58:56 CDT." <01ca01c696cd$2e453f30$99dfdfdf@bakuhatsu.net>

So, like, the other day "Matt Sealey" mumbled:
> 
> I have nothing real to contribute other than I would like to see it :)

Disbelief.  :-)

> Before I asked I checked Google (as is expected of anyone these days)
> and found some discussions on debian-powerpc from 2002 but nobody
> really did anything and nothing really came of it. I know 4 years later
> all we have is powernowd which pokes up cpufreq which only supports
> DFS and certain kinds of Mac PMU. 

Which is why it is all being revitalized now... :-)
There was a mini symposium a couple months ago that started
a few working groups to help kick start this back into viability.

> ICTC is such a simple thing to support and you can slow down the CPU
> pretty comprehensively (from halving to 255x in theory) with an on and
> off flag. I am surprised nobody implemented a cpufreq governer even if
> it is totally useless and gives no perceivable benefits..

See?  You _are_ contributing already.  I encourage
you to hit the linux-pm@lists•osdl.org list for a spell!

You could start here:
	https://lists.osdl.org/mailman/listinfo/linux-pm

Thanks,
jdl