linux-kernel - Re: SATA Performance with Intel ICH6

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Message-Id: <200611281109.47438.fink@mpe.mpg.de>
Date:	Tue, 28 Nov 2006 11:09:47 +0100
From:	"Martin A. Fink" <fink@....mpg.de>
To:	Alan <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: SATA Performance with Intel ICH6

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 ?

Thank you very much,

Martin
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