Power-Mgt (Was: Re: cvs commit: src/sys/i386/cpufreq est.c )

[Brooks Davis]

On Tue, Mar 18, 2008 at 03:04:36PM +0000, Joao Barros wrote:
> On Tue, Mar 18, 2008 at 1:54 PM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> >
> > >To avoid lots of code duplication I think we would need to provide some sort
> > >of "idle" device support in new-bus.  Possibly something like this:
> >
> > We need different levels of "active" also, EnergyStar requires machines
> > to reduce ethernet speed from GE to 100M when idle, (this saves approx
> > 2W, 1W in either end of the cable).
> 
> It's common practice to force connection speeds on both switches and
> NICs in datacenter environments.
> When I find a machine with a nic connected at 10mbit Half Duplex I
> already know it's forced on the switch and someone forgot to setup the
> server correctly.
> What I'm saying is, if something is about to automagically happen,
> people should be aware of it. *Big neon lights* :-)

I'd think any implementation would only be on if autoneg is on...

-- Brooks
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