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Date:      Wed, 12 Dec 2012 13:16:53 +0100 (CET)
From:      Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To:        Adrian Chadd <adrian@freebsd.org>
Cc:        Eitan Adler <lists@eitanadler.com>, "Ronald F. Guilmette" <rfg@tristatelogic.com>, freebsd-hackers@freebsd.org
Subject:   Re: FreeBSD for serious performance? (was: Re: 9.x -- New Install -- serious partition misalignment)
Message-ID:  <alpine.BSF.2.00.1212121316380.1751@wojtek.tensor.gdynia.pl>
In-Reply-To: <CAJ-VmoktZGn_LGtnb4aJD2sYOKpWLiJaqq_vW97-PFxagYRq%2BA@mail.gmail.com>
References:  <20121209014547.238070@gmx.com> <1830.1355025154@tristatelogic.com> <20121208230433.2c54f44a@kan.dyndns.org> <CAF6rxgnL-QX2R_QzMuhhTuqBywmURGnivu0uL5dhMw1ds_xUzg@mail.gmail.com> <CAJ-VmoktZGn_LGtnb4aJD2sYOKpWLiJaqq_vW97-PFxagYRq%2BA@mail.gmail.com>

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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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