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
next prev parent reply other threads:[~2008-02-25 22:23 UTC|newest]
Thread overview: 8+ 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
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