FreeBSD 6.x + SATA NCQ?

[Michael Butler]

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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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