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Date: Mon, 25 Feb 2008 23:34:32 +0100 From: Pavel Machek <pavel@....cz> To: Mark Lord <liml@....ca> Cc: kernel list <linux-kernel@...r.kernel.org>, Linux-pm mailing list <linux-pm@...ts.osdl.org>, stern@...land.harvard.edu, linux-ide@...r.kernel.org Subject: Re: [ugly patch] Save .15W-.5W by AHCI powersaving 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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