From owner-freebsd-hardware Mon Aug 24 23:30:43 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA08798 for freebsd-hardware-outgoing; Mon, 24 Aug 1998 23:30:43 -0700 (PDT) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from cain.gsoft.com.au (genesi.lnk.telstra.net [139.130.136.161]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA08785 for ; Mon, 24 Aug 1998 23:30:34 -0700 (PDT) (envelope-from doconnor@cain.gsoft.com.au) Received: from cain (localhost [127.0.0.1]) by cain.gsoft.com.au (8.8.8/8.6.9) with ESMTP id PAA06960; Tue, 25 Aug 1998 15:59:13 +0930 (CST) Message-Id: <199808250629.PAA06960@cain.gsoft.com.au> X-Mailer: exmh version 2.0.2 2/24/98 To: john hood cc: Joe Gleason , freebsd-hardware@FreeBSD.ORG Subject: Re: UDMA Support In-reply-to: Your message of "Tue, 25 Aug 1998 02:10:26 -0400." <19980825021026.12093@owl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 25 Aug 1998 15:59:13 +0930 From: "Daniel O'Connor" Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > > FreeBSD 3.0 supports IDE DMA. SCSI disks will give better performance > > in multiple-disk or high load scenarios. > -current supports DMA, but not Ultra DMA, which is faster and has > CRC error checking. (I haven't got an Ultra DMA motherboard and > drive to code/debug on.) This is not much of a problem yet, as > IDE drives cannot yet use all the bandwidth of standard DMA, but > it looks like it will be soon, the way IDE drives are going. :) And the less time the computer spends moving data off your HD means more time to render Quake frames (or something). I have a UDMA mobo and 3 UDMA drives, so I can test it for you. I could probably code some of it if I knew what to do =) (ie the UDMA spec) --------------------------------------------------------------------- |Daniel O'Connor software and network engineer for Genesis Software | |http://www.gsoft.com.au | |The nice thing about standards is that there are so many of them to| |choose from. -- Andrew Tanenbaum | --------------------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message