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

Adrian Chadd adrian at freebsd.org
Sun Dec 9 04:19:09 UTC 2012


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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