linux-kernel - Re: Disk spin down issue on shut down/suspend to disk

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Date:	Wed, 08 Aug 2007 11:56:45 +0900
From:	Tejun Heo <htejun@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Maciej Rutecki <maciej.rutecki@...il.com>,
	Michael Sedkowski <sedmich@...il.com>, trenn@...e.de,
	Robert Hancock <hancockr@...w.ca>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: Disk spin down issue on shut down/suspend to disk

Rafael J. Wysocki wrote:
> Well, on my box (nx6325) with the appended (experimental) patch applied
> on top of 2.6.23-rc1 with the patchset from
> http://www.sisk.pl/kernel/hibernation_and_suspend/2.6.23-rc2/patches/ , the
> double spin down doesn't occur during hibernation and the system is shut down
> notceably faster.

Can you please explain what the patch does?  So, I take it that entering
S4 also spins down the disk.  Does the patch remove the ACPI spin down
or libata one?

-- 
tejun
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