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From: Mark Lord <liml@rtr.ca>
To: Pavel Machek <pavel@ucw.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>,
	Linux-pm mailing list <linux-pm@lists.osdl.org>,
	stern@rowland.harvard.edu, linux-ide@vger.kernel.org
Subject: Re: [ugly patch] Save .15W-.5W by AHCI powersaving
Date: Mon, 25 Feb 2008 17:26:09 -0500	[thread overview]
Message-ID: <47C34081.5090205@rtr.ca> (raw)
In-Reply-To: <20080225134558.GA1611@elf.ucw.cz>

Pavel Machek wrote:
> 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.
It makes good use of AHCI-specific features.

Has it been tested with a Port-Multiplier yet?

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.

Cheers

  reply	other threads:[~2008-02-25 22:23 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-25 13:45 [ugly patch] Save .15W-.5W by AHCI powersaving Pavel Machek
2008-02-25 22:26 ` Mark Lord [this message]
2008-02-25 22:34   ` Pavel Machek
2008-02-26 15:52     ` Mark Lord
2008-02-26 21:49       ` Pavel Machek
2008-02-25 22:42   ` Jeff Garzik
2008-02-26 16:21     ` Matthew Garrett
2008-03-21  7:49     ` Oliver Neukum
2008-03-21  7:49       ` [linux-pm] " Oliver Neukum

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