From owner-freebsd-questions Sun May 24 01:01:07 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id BAA09160 for freebsd-questions-outgoing; Sun, 24 May 1998 01:01:07 -0700 (PDT) (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 BAA09139 for ; Sun, 24 May 1998 01:01:00 -0700 (PDT) (envelope-from toor@dyson.iquest.net) Received: (from root@localhost) by dyson.iquest.net (8.8.8/8.8.8) id DAA00892; Sun, 24 May 1998 03:00:52 -0500 (EST) (envelope-from toor) Message-Id: <199805240800.DAA00892@dyson.iquest.net> Subject: Re: Compatibility with Ultra IDE drives? In-Reply-To: from Doug White at "May 23, 98 11:57:30 pm" To: dwhite@resnet.uoregon.edu Date: Sun, 24 May 1998 03:00:52 -0500 (EST) Cc: lfloyd@sonic.net, freebsd-questions@FreeBSD.ORG From: "John S. Dyson" Reply-To: dyson@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL38 (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 Doug White said: > > 2.2.5 doesn't, so you get standard old IDE without any UltraDMA > improvement. -CURRENT can grok UltraDMA and can give you the (supposed) > performance boost. > Given you have a very fast machine to start with (like a fast P5 or faster), bus-master DMA does help alot. There is a very noticable difference in responsiveness of the system under load with the DMA. I actually wasn't convinced until I mistakenly built a system without the DMA, and noticed that it was somehow "slow." -- 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