Date: Sun, 11 May 2008 23:09:38 -0700 From: Jeremy Chadwick <koitsu@freebsd.org> To: "Andrey V. Elsukov" <bu7cher@yandex.ru> Cc: stable@freebsd.org, jonathan@kc8onw.net, sos@FreeBSD.org Subject: Re: ATA APM and NCQ support in FreeBSD atacontrol Message-ID: <20080512060938.GA2007@eos.sc1.parodius.com> In-Reply-To: <4827D531.7000603@yandex.ru> References: <29626.214.13.212.30.1210554531.squirrel@www.kc8onw.net> <20080512030647.GA93725@eos.sc1.parodius.com> <4827D531.7000603@yandex.ru>
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On Mon, May 12, 2008 at 09:27:13AM +0400, Andrey V. Elsukov wrote: > Jeremy Chadwick wrote: >> I believe NCQ is supported, assuming that your controller is operating >> in AHCI mode and your disk supports NCQ. This mainly applies to Intel >> ICHx controllers, but there are others which support it as well. >> There's also NCQ support in non-AHCI drivers like hptmv(4), rr232x(4), >> hptrr(4), and mpt(4) with SATA disks. > > No. ata(4) driver currently doesn't support/use NCQ. Thanks for this information -- I had no idea! I'll add this to my Common Issues page, although it's not so much an "issue" but more so a feature. I was always under the impression that AHCI included automatic support for negotiation and use of extensions like NCQ and TCQ: http://en.wikipedia.org/wiki/Native_Command_Queuing http://www.seagate.com/content/docs/pdf/whitepaper/D2c_tech_paper_intc-stx_sata_ncq.pdf -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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