Date: Mon, 23 Oct 2006 08:24:35 -0400 From: Michael Butler <imb@protected-networks.net> To: "O. Hartmann" <ohartman@uni-mainz.de> Cc: Adrian Chadd <adrian@freebsd.org>, FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: FreeBSD 6.x + SATA NCQ? Message-ID: <453CB483.7050809@protected-networks.net> In-Reply-To: <453CB1F0.2060901@uni-mainz.de> References: <d763ac660610222357r5db24977i8d68fcb75ad05735@mail.gmail.com> <453CB1F0.2060901@uni-mainz.de>
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O. Hartmann wrote:
> Adrian Chadd wrote:
>> 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?
>>
> 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.
Sadly, a good proportion of current laptops fitted with SATA-150
drives and based on the the Intel ICH-7 chipset do not fully
initialize AHCI mode in the BIOS. Specifically, no resources are
allocated to supporting it. This complicates any potential driver
implementation somewhat :-(
Michael
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