From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [ugly patch] Save .15W-.5W by AHCI powersaving Date: Mon, 25 Feb 2008 23:34:32 +0100 Message-ID: <20080225223432.GN2659@elf.ucw.cz> References: <20080225134558.GA1611@elf.ucw.cz> <47C34081.5090205@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <47C34081.5090205@rtr.ca> Sender: linux-ide-owner@vger.kernel.org To: Mark Lord Cc: kernel list , Linux-pm mailing list , stern@rowland.harvard.edu, linux-ide@vger.kernel.org List-Id: linux-pm@vger.kernel.org Hi! >> This is a patch (very ugly, assumes you have just one disk) to bring >> powersaving to AHCI. You need Alan's SCSI autosuspend (attached) patch >> as a base. >> >> It saves .5W compared to config with disk spinning, and even .15W >> compared to hdparm -y... on my thinkpad x60 anyway. > .. > > There was a discussion of this here today. Real-life discussion, or something I could read? :-). > It makes good use of AHCI-specific features. > > Has it been tested with a Port-Multiplier yet? I do not know what port-multiplier is, sorry. But it was not really tested. It is not expected to work on any other config than notebook very similar to mine. > This is cool enough that we really ought to do a hardware-independent > version, so that all SATA interfaces could benefit. Especially ata_piix, > but others too. Well, it seems like it is 10 lines per driver once Alan's SCSI autosuspend patches are in... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html