re: CVS commit: src/sys/arch/x86/x86

[matthew green <mrg%eterna.com.au@localhost>]

> On Fri, Mar 04, 2011 at 04:04:53PM +1100, matthew green wrote:
> > > Raise the return value of the match-function of est(4) and powernow(4).
> > > The assigned priorities are now: 10 for acpicpu(4), 5 for est(4) and
> > > powernow(4), and 1 for odcm(4). These are used to pick the preferred 
> > > driver.
> > 
> > to the best of my knowledge, odcm(4) is separate to est(4) and
> > old school speedstep, and both can be active at the same time.
> > 
> > i've certainly done this on an old P4-M.
> 
> This was discussed on port-i386@ and port-amd64@. Yes, both may be used at
> the same time. Yet, this is a curiosity. ODCM is nearly useless. No one even
> reported using it.

yes - i never bothered to commit my code to use it because i
could only measure at best a 1-2% battery life increase (ie,
i wasn't really even sure i saw anything!) for a 7/8ths drop
in performance (ie, running at 1/8 duty cycles.)


.mrg.