FreeBSD for serious performance? (was: Re: 9.x -- New Install -- serious partition misalignment)

Wed Dec 12 12:16:59 UTC 2012

what's a point of not using ahci(4)?

On Sat, 8 Dec 2012, Adrian Chadd wrote:

> Hi,
>
> Yes. atacam supports NCQ.
>
> The older IDE/ATA code doesn't support NCQ. The CAM ATA code (ie,
> atacam) supports it if the drive supports it.
>
> So, the "FreeBSD doesn't do NCQ" point is incorrect.
>
> If you don't believe me - look in sys/cam/ata/ata_da.c, look for ata_ncq_cmd().
>
>
> Adrian
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