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

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Message-ID: <466DFE09.3020408@garzik.org>
Date:	Mon, 11 Jun 2007 21:59:37 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Dagfinn Ilmari Mannsåker <ilmari@...ari.org>
CC:	Arjan van de Ven <arjan@...ux.intel.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	james.bottomley@...eleye.com, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	htejun@...il.com
Subject: Re: [patch 3/3] Enable Aggressive Link Power management for AHCI
 controllers.

Dagfinn Ilmari Mannsåker wrote:
> Arjan van de Ven <arjan@...ux.intel.com> writes:
> 
>> Henrique de Moraes Holschuh wrote:
>>> On Mon, 11 Jun 2007, Kristen Carlson Accardi wrote:
>>>> 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.
>>> Just some food for thought:
>>> If you split it into a enable/disable (0/1) attribute, and a level
>>> attribute
>> on/off doesn't really make sense if the question is "do you favor power
>> or do you favor performance".......
> 
> How about just making it a numeric scale with 0 meaning no power saving
> and then some fixed number of levels (e.g 0-9)?

The original proposal seems far more intuitive than these alternatives.

	Jeff



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