Date: Sat, 8 Dec 2012 20:19:07 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Eitan Adler <lists@eitanadler.com> 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: <CAJ-VmoktZGn_LGtnb4aJD2sYOKpWLiJaqq_vW97-PFxagYRq%2BA@mail.gmail.com> In-Reply-To: <CAF6rxgnL-QX2R_QzMuhhTuqBywmURGnivu0uL5dhMw1ds_xUzg@mail.gmail.com> References: <20121209014547.238070@gmx.com> <1830.1355025154@tristatelogic.com> <20121208230433.2c54f44a@kan.dyndns.org> <CAF6rxgnL-QX2R_QzMuhhTuqBywmURGnivu0uL5dhMw1ds_xUzg@mail.gmail.com>
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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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