Date: Tue, 28 Nov 2006 10:43:51 +0000
From: Alan <alan@lxorguk.ukuu.org.uk>
To: "Martin A. Fink" <fink@mpe.mpg.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: SATA Performance with Intel ICH6
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In-Reply-To: <200611281109.47438.fink@mpe.mpg.de>
References: <200611281109.47438.fink@mpe.mpg.de>
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On Tue, 28 Nov 2006 11:09:47 +0100
"Martin A. Fink" <fink@mpe.mpg.de> wrote:

> Dear Alan,
> 
> You wrote
> > The PIIX interface needs CPU intervention each command, so in practice
> > about every 64K or so, and the CPU gets stalled waiting for the disk
> > during the setup of each I/O. The newer kernels support AHCI which does
> > not have this overhead, but it is only present on the newest intel
> > controllers.
> 
> Can you tell me the name of these newest controllers? Is it ICH7 or 8 ?
> What kernel versions? dmesg only shows ACPI and u/e/o hci_* host controller.
> (kernel version is 2.6.8-24.25-smp). How can I switch to AHCI ?

According to the docs

	ICH6
	ICH6M
	ICH7
	ICH7M
	ICH7R
	ESB2
	ICH7-M DH
	ICH8
	ICH8M

These devices support both "legacy" and "ahci" modes of operation,
usually controlled by a BIOS setting.
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