linux-kernel - Re: [ugly patch] Save .15W-.5W by AHCI powersaving

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <47C34081.5090205@rtr.ca>
Date:	Mon, 25 Feb 2008 17:26:09 -0500
From:	Mark Lord <liml@....ca>
To:	Pavel Machek <pavel@....cz>
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

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
--
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/