linux-kernel - Re: [PATCH] ata: ahci: power off unused ports

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Message-ID: <20080531080015.GG5405@ucw.cz>
Date:	Sat, 31 May 2008 10:00:15 +0200
From:	Pavel Machek <pavel@....cz>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc:	Theodore Tso <tytso@....edu>, jeff@...zik.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: ahci: power off unused ports

Hi!

> > > As far as I know the patch has gone nowhere.  I believe that 
> > > Jeff wanted something more flexible than the module parameter that
> > > I provided to override the BIOS options.  I am not working on this,
> > > I figured he had a pretty firm idea what he wanted so he was better
> > > equipped to write the patch.
> > 
> > Thanks Kristen,
> > 
> > Can you say which laptops you had tested this on where it saved power?
> > (Did you test any Thinkpads, in particular?)  I'm wondering if it's
> > worth trying to forward port your patch as a private mod to my kernel;
> > 30 to 40 minutes of extra battery life is nothing to sneeze at!
> > 
> > 						- Ted
> > 
> 
> I tested this on an Intel mobile software development platform 
> with a newer mobile ICH - the power savings were measured at the actual 
> component (via probes on the ICH), so I did not measure the power 
> savings at the wall socket, although I would expect the power savings
> to be even greater on the other side of the power supply.  So in short,
> yes, I think it's worth it to give it a try - the patch is pretty
> unintrusive, so it should be that difficult a port to do.

Can you repost the patch? I believe we should push it and only add
complex enable/disable functionality if someone needs it...

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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