linux-kernel - Re: [patch 3/3] Enable Aggressive Link Power management for AHCI controllers.

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Message-ID: <466DAA09.7090000@garzik.org>
Date:	Mon, 11 Jun 2007 16:01:13 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
CC:	james.bottomley@...eleye.com, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	htejun@...il.com, arjan@...ux.intel.com
Subject: Re: [patch 3/3] Enable Aggressive Link Power management for AHCI
 controllers.

Kristen Carlson Accardi wrote:
> This patch will set the correct bits to turn on Aggressive
> Link Power Management (ALPM) for the ahci driver.  This
> will cause the controller and disk to negotiate a lower
> power state for the link when there is no activity (see
> the AHCI 1.x spec for details).  This feature is mutually
> exclusive with Hot Plug, so when ALPM is enabled, Hot Plug
> is disabled.  ALPM will be enabled by default, but it is
> settable via the scsi host syfs interface.  Possible 
> settings for this feature are:
> 
> Setting		Effect
> ----------------------------------------------------------
> min_power	ALPM is enabled, and link set to enter 
> 		lowest power state (SLUMBER) when idle
> 		Hot plug not allowed.
> 
> max_performance	ALPM is disabled, Hot Plug is allowed
> 
> medium_power	ALPM is enabled, and link set to enter
> 		second lowest power state (PARTIAL) when
> 		idle.  Hot plug not allowed.
> 
> Signed-off-by:  Kristen Carlson Accardi <kristen.c.accardi@...el.com>

seems OK at first glance, though I'll have questions about hardware 
behavior once I get off this day-long Intel conference call :)


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