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Date: Mon, 23 Oct 2006 14:13:36 +0200
From: "O. Hartmann" <ohartman@uni-mainz.de>
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To: Adrian Chadd <adrian@freebsd.org>
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Cc: FreeBSD Stable <freebsd-stable@freebsd.org>
Subject: Re: FreeBSD 6.x + SATA NCQ?
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Adrian Chadd wrote:
> Hiya,
> 
> Is there support for SATA tagged queueing in FreeBSD-6? Any ideas on
> which chipsets would support it or how to determine whether FreeBSD is
> using it?
> 
> Thanks,
> 
> 
> Adrian
> 
As I know, this is on one hand dependend on the used chipset and on the 
other haned dependend on the ATA driver. Those chipsets with NCQ AND 
AHCI (mostly Intel ICH based chipsets) should be managed and addressed 
by a suitable driver (as far as I know not yet available for FreeBSD 6.X).
As someone can read at the nVidia homepage, their nForce4-SLI chipsets 
also supports NCQ, but it is proprietary thing, not commonly accessible 
via AHCI. And due to the lack of information, like most of nVidias 
goodies for computers, there is no access to this feature via the open 
source way.

If I'm wrong someone should correct my statement.

Regards,
Oliver