From owner-freebsd-questions Tue Feb 24 14:10:22 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id OAA21026 for freebsd-questions-outgoing; Tue, 24 Feb 1998 14:10:22 -0800 (PST) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id OAA20955 for ; Tue, 24 Feb 1998 14:10:00 -0800 (PST) (envelope-from toor@dyson.iquest.net) Received: (from root@localhost) by dyson.iquest.net (8.8.8/8.8.8) id RAA03544; Tue, 24 Feb 1998 17:09:49 -0500 (EST) (envelope-from toor) From: "John S. Dyson" Message-Id: <199802242209.RAA03544@dyson.iquest.net> Subject: Re: IDE DMA/33 Support In-Reply-To: <199802242143.QAA28389@versa.eng.comsat.com> from Marc Giannoni at "Feb 24, 98 04:43:52 pm" To: marc@versa.eng.comsat.com (Marc Giannoni) Date: Tue, 24 Feb 1998 17:09:49 -0500 (EST) Cc: freebsd-questions@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL32 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Marc Giannoni said: > I > Ahem...(sorry) I've seen a lot about DMA/33 for IDE these days. > Does the 'wd' driver support DMA yet? > If not are there plans to? > DMA/33 is pretty fast! About as fast as the PCI bus can go! > Current works with the PIIX* chipsets (Intel) in DMA or DMA/33 mode as appropriate and with a few others including the Promise board. If you use the older -stable code, the MB chipsets will work with FreeBSD, but will not work in DMA/33 mode. I personally run -current with (currently 6) IDE drives. 4 Drives on the PIIX3 on my SuperMicro P6DNF under SMP, and 2 Drives running DMA/33 on my Promise card. The system is very snappy, and performance is probably good enough except for certain types of server applications, where drive reliability or drive performance must be the highest. -- John | Never try to teach a pig to sing, dyson@freebsd.org | it just makes you look stupid, jdyson@nc.com | and it irritates the pig. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message