linux-kernel - Re: SATA status reports update

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Message-ID: <41840b750610022002j4d73ab23l83a88ec757925b08@mail.gmail.com>
Date:	Tue, 3 Oct 2006 05:02:25 +0200
From:	"Shem Multinymous" <multinymous@...il.com>
To:	"Jeff Garzik" <jeff@...zik.org>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	"Pavel Machek" <pavel@...e.cz>, "Tejun Heo" <htejun@...il.com>
Subject: Re: SATA status reports update

Hi Jeff,

On 9/29/06, Jeff Garzik <jeff@...zik.org> wrote:
> Software status:
>         http://linux-ata.org/software-status.html

It says:
"Over and above the power management specified in the ATA/ATAPI
specification, one can aggressively control the power consumption of
SATA hosts, the SATA bus, and the SATA device. [...]
There is little demand at the present time for aggressive, automatic
power management under Linux."

What about laptops on batteries? Pavel reports a 1W power draw by his
ThinkPad's ICH7M SATA controller [1]. It would be neat to eliminate
this when the disk is not in use (and powering up the silicon can't
take much longer than spinning up a chunk glass to 7200RPM).

  Shem

[1] http://atrey.karlin.mff.cuni.cz/~pavel/swsusp/8hours.pdf
    slide 11
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