Date: Sat, 8 Dec 2012 23:21:04 -0500 From: Eitan Adler <lists@eitanadler.com> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-hackers@freebsd.org, "Ronald F. Guilmette" <rfg@tristatelogic.com> Subject: Re: FreeBSD for serious performance? (was: Re: 9.x -- New Install -- serious partition misalignment) Message-ID: <CAF6rxgkYAhF--C96XBb7JXGYdr2rK0F_AA_fx=d%2B9kKpTr=CXw@mail.gmail.com> 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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On 8 December 2012 23:19, Adrian Chadd <adrian@freebsd.org> 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(). Thanks for the correction - my memory was wrong. -- Eitan Adler
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