From owner-freebsd-stable Tue Jul 4 12:19:43 2000 Delivered-To: freebsd-stable@freebsd.org Received: from mail.gmx.net (pop.gmx.net [194.221.183.20]) by hub.freebsd.org (Postfix) with SMTP id 1990937B585 for ; Tue, 4 Jul 2000 12:19:32 -0700 (PDT) (envelope-from Gerhard.Sittig@gmx.net) Received: (qmail 8553 invoked by uid 0); 4 Jul 2000 19:19:28 -0000 Received: from p3e9e7a54.dip.t-dialin.net (HELO speedy.gsinet) (62.158.122.84) by mail.gmx.net with SMTP; 4 Jul 2000 19:19:28 -0000 Received: (from sittig@localhost) by speedy.gsinet (8.8.8/8.8.8) id TAA12191 for freebsd-stable@FreeBSD.ORG; Tue, 4 Jul 2000 19:16:30 +0200 Date: Tue, 4 Jul 2000 19:16:30 +0200 From: Gerhard Sittig To: freebsd-stable@FreeBSD.ORG Subject: Re: Dump takes ages on SCSI. (several times faster on IDE) Message-ID: <20000704191630.U5945@speedy.gsinet> Mail-Followup-To: freebsd-stable@FreeBSD.ORG References: <20000703193834.Q5945@speedy.gsinet> <200007041222.FAA02795@mass.osd.bsdi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <200007041222.FAA02795@mass.osd.bsdi.com>; from msmith@freebsd.org on Tue, Jul 04, 2000 at 05:22:36AM -0700 Organization: System Defenestrators Inc. Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, Jul 04, 2000 at 05:22 -0700, Mike Smith wrote: > > > > The Problem with aha1542 (ISA busmaster capable controller) > > in PCI boards is that it is located "at the end" of a long > > chain to memory. Chances are, busmastering will not work at > > all behind the PCI to ISA bridge since all the PCI devices > > have higher priority and the ISA gadget never gets any access > > granted or at least always too late. You're better off with > > a PCI controller. > > This is Just Not True. Can you please tell me more about it? I'm not sure of the priority thing I mention above, but the fact that ISA busmaster devices and PCI boards somewhat collide or counter operate (sorry, lacking better words once more) is what I got from serious papers here. How direct is the access method an ISA controller has to the memory when sitting behind a bridge? I would be glad to believe a 1542B/C in a PCI machine is A Good Thing(TM). :) virtually yours 82D1 9B9C 01DC 4FB4 D7B4 61BE 3F49 4F77 72DE DA76 Gerhard Sittig true | mail -s "get gpg key" Gerhard.Sittig@gmx.net -- If you don't understand or are scared by any of the above ask your parents or an adult to help you. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message