linux-kernel - Re: AHCI power saving (was Re: Ten hours on X60s)

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Date:	Mon, 13 Nov 2006 16:11:30 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Pavel Machek <pavel@....cz>, John Fremlin <not@...t.any.name>,
	kernel list <linux-kernel@...r.kernel.org>, htejun@...il.com,
	jim.kardach@...el.com, ak@...e.de
Subject: Re: AHCI power saving (was Re: Ten hours on X60s)

On Mon, 13 Nov 2006 10:32:24 -0500
Jeff Garzik <jeff@...zik.org> wrote:

> Therein lies a key problem.  Turning on all of AHCI's aggressive power 
> management features DOES save a lot of power.  But at the same time, it 
> shortens the life of your hard drive, particularly hard drives that are 
> really PATA, but have a PATA<->SATA bridge glued on the drive to enable 
> connection to SATA controllers.

We already detect PATA over SATA so we can trivially address that (the
knobble check). Similarly we can turn ALPME on using a timer so it kicks
in after long idle periods only, or tie it to laptop mode.

For a laptop type environment with SATA not bridged PATA turning it on is
clearly the right thing to do.

Alan

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