Date: Mon, 13 Dec 2004 20:43:33 -0700 From: Scott Long <scottl@freebsd.org> To: Peter Wemm <peter@wemm.org> Cc: cvs-src@freebsd.org Subject: Re: cvs commit: src/sys/i386/pci pci_cfgreg.c Message-ID: <41BE6165.7070306@freebsd.org> In-Reply-To: <200412131939.46695.peter@wemm.org> References: <200412060827.iB68RAmE058040@repoman.freebsd.org> <200412131416.54087.peter@wemm.org> <20041214013304.GB3352@dragon.nuxi.com> <200412131939.46695.peter@wemm.org>
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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" <obrien@FreeBSD.org> 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
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