linux-kernel - Re: [patch 0/3] AHCI Link Power Management

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Message-Id: <20070612084319.b2e69248.kristen.c.accardi@intel.com>
Date:	Tue, 12 Jun 2007 08:43:19 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Tejun Heo <htejun@...il.com>, james.bottomley@...eleye.com,
	linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [patch 0/3] AHCI Link Power Management

On Tue, 12 Jun 2007 00:43:12 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> We will do AHCI link PM -- presuming that I can be convinced that it 
> does not repeatedly park the hard drive heads, or something similarly 
> annoying on PATA<->SATA bridges and similar setups.
> 
> IF it works as advertised -- a big if considering all the AHCI silicon 
> implementations out there -- we definitely want to use it.
> 
> 	Jeff
> 

I understand that this is a concern of yours based on some experience you
had with earlier controllers.  In general, this behavior would be considered
incorrect - link power management should not translate to disk parking, even
on PATA->SATA brigdes, and if it does, then that's completely broken.  That 
said, I would believe you if you said broken hardware exists, and when you 
get specific examples of it, you can add it to the blacklist for this feature.
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