From owner-cvs-src@FreeBSD.ORG Tue Dec 14 03:43:57 2004 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 202AB16A4CE; Tue, 14 Dec 2004 03:43:57 +0000 (GMT) Received: from pooker.samsco.org (pooker.samsco.org [168.103.85.57]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9783B43D39; Tue, 14 Dec 2004 03:43:56 +0000 (GMT) (envelope-from scottl@freebsd.org) Received: from [192.168.254.11] (junior-wifi.samsco.home [192.168.254.11]) (authenticated bits=0) by pooker.samsco.org (8.12.11/8.12.10) with ESMTP id iBE3kXFs044108; Mon, 13 Dec 2004 20:46:33 -0700 (MST) (envelope-from scottl@freebsd.org) Message-ID: <41BE6165.7070306@freebsd.org> Date: Mon, 13 Dec 2004 20:43:33 -0700 From: Scott Long User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.2) Gecko/20040929 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Peter Wemm References: <200412060827.iB68RAmE058040@repoman.freebsd.org> <200412131416.54087.peter@wemm.org> <20041214013304.GB3352@dragon.nuxi.com> <200412131939.46695.peter@wemm.org> In-Reply-To: <200412131939.46695.peter@wemm.org> X-Enigmail-Version: 0.86.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, hits=0.0 required=3.8 tests=none autolearn=no version=2.63 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on pooker.samsco.org cc: Dag-Erling Sm?rgrav cc: src-committers@freebsd.org cc: cvs-all@freebsd.org cc: obrien@freebsd.org cc: cvs-src@freebsd.org Subject: Re: cvs commit: src/sys/i386/pci pci_cfgreg.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Dec 2004 03:43:57 -0000 Peter Wemm wrote: > On Monday 13 December 2004 05:33 pm, David O'Brien wrote: > >>On Mon, Dec 13, 2004 at 02:16:53PM -0800, Peter Wemm wrote: >> >>>On Monday 13 December 2004 01:47 pm, Dag-Erling Sm?rgrav wrote: >>> >>>>"David O'Brien" writes: >>>> >>>>>At the moment I don't know of anyone with an AMD64 PCI Express >>>>>motherboard. >>>> >>>>The Celestica A8440 has dual onboard PCI-X NICs and two PCI-X >>>>slots. Surely someone in the project should be able to get their >>>>hands on one? I for one would love to have one for the >>>>tinderbox... >>>> >>>>DES >>> >>>Just for clarity, we were talking about PCI-Express, not PCI-X. >>> >>>BTW, I think it is amusing that the only machines readily available >>>that have PCI-Express to run FreeBSD/amd64 on are Intel systems... >> >>Why? >>Today there is zero benefit to PCI-Express vs. AGP 8x or PCI-X >>133mhz. > > > Just like there was zero benefit to having a prototype amd64 machine to > do porting work on before they started coming out in retail? At the > time, there was zero benefit compared to a 32 bit Athlon-XP system. > > It's going to suck when they do reach the stores and our answer to > support questions is "no", while Linux and windows do. > > On that note, we still barely support anything more from AMD's platform > than the basic instruction set due to lack of documentation.. That's > why FreeBSD/amd64 ran so quickly on the Intel hardware. We only used > the most basic features of the generic instruction set in an otherwise > PC platform. We don't take advantage of the IOMMU, the timers, etc. > (Still no documentation). I'd have expected AMD to push as hard as > they can to get every advantage while Intel is still trying to recover > their balance. Having IOMMU docs could have a very positive benefit for things like ATA on amd64. However, I can't even begin to evaluate what that benefit might be until docs become available. Scott