linux-kernel - Re: Power management for SCSI

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Date:	Tue, 19 Aug 2008 09:38:39 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	James.Bottomley@...senPartnership.com, teheo@...ell.com,
	oneukum@...e.de
Subject: Re: Power management for SCSI

Hi!

> > Add support for autosuspend/autoresume. Lowlevel driver can use it to
> > spin the disk down and power down its SATA link, to turn off the USB
> > interface, etc.
> > 
> > Spinning down the disk is useful - saves ~0.5W here. Powering down
> > SATA controller is even better -- should save ~1W.
> > 
> > Now, I guess the patch will need to be split to small pieces for
> > merge... I tried to rearrange it so that the documentation and hooks
> > go before stuff that needs the hooks, and before Kconfig enabler. If
> > it looks reasonably good, I'll split it into smaller pieces.
> 
> James had a number of objections to my original patch; you can read 
> them here:
> 
> https://lists.linux-foundation.org/pipermail/linux-pm/2008-March/016849.html
> 
> I haven't had time yet to work on an improved version.

Would it make sense to split the patches into "autosuspend for SCSI
devices" and "autosuspend for SCSI controllers" for easier
review/merge? I guess I'll start with the devices, they seem easier...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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