linux-kernel - Re: [patch 0/4] SATA power savings patches (ALPM)

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Message-ID: <469277D3.2020403@tmr.com>
Date:	Mon, 09 Jul 2007 14:00:51 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
CC:	jeff@...zik.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	James.Bottomley@...eleye.com, edwintorok@...il.com,
	axboe@...nel.dk, linux-scsi@...r.kernel.org
Subject: Re: [patch 0/4] SATA power savings patches (ALPM)

Kristen Carlson Accardi wrote:
> Hi Jeff,
> Here's the most recent patches for ALPM.  These are also located at:
> http://www.kernel.org/pub/linux/kernel/people/kristen/patches/SATA/alpm
> 
> These patches implement Aggressive Link Power management for AHCI 
> controllers.  This feature is described in detail in the AHCI 1.x spec.
> It provides power savings of anywhere from .5-1.5 Watts depending on
> the system when it is enabled.  (a graph demonstrating power savings
> of this patch along with other power patches is located at 
> http://www.linuxpowertop.org/results.php for your enjoyment).
> 
> This patch is changed from the previous version in that it incorporates all
> the feedback I've gotten on the patches to date.  It changes the default
> of the ahci driver to be max_performance rather than min_power, so userspace
> will need to explicitly enable alpm via the sysfs interface when it deems
> it an appropriate time to do this.  In addition, the patch was changed to
> allow either HIPM or DIPM as a prerequisite for enabling ALPM, rather than 
> just using HIPM.
> 
I suspect these changes would be useful for servers as well, extending 
run time when a failover to UPS is detected.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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