Date: Wed, 5 Nov 2003 09:23:47 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Fred Clift <fclift@verio.net> Cc: freebsd-alpha@freebsd.org Subject: Re: Miata MX5 and 64 bit gigabit ethernet Message-ID: <16297.2035.310311.968335@grasshopper.cs.duke.edu> In-Reply-To: <20031104155314.W3281@irfcn.qzm.berz.irevb.arg> References: <20031102022925.W28113@loafier.com> <20031104155314.W3281@irfcn.qzm.berz.irevb.arg>
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Fred Clift writes: > If the card does dma, then it will be unlikley to work. I dont know that > Gigabit ethernet existed when miatas were new, and hence, DEC wouldn't Please get a clue or stop spreading FUD. The DMA bug occurs when crossing a page (8K) boundary using scatter/gather DMA READs. FreeBSD doesn't even use scatter/gather for anything but ISA cards at the moment. Most GigE cards are not ISA ;) For what its worth, we used Alteon Tigon II Gigabit nics on our Miatas back when the hardware was current and 4.0 was -CURRENT. Even if it works, don't expect great performance. As best as I can remember, we never managed to get much more than 500Mb/sec throughput, even with jumbo frames. This is partly because the Miata's PCI bus / memory system really sucks by modern standards and it can't get anywhere near the 250MB/sec theoretical PCI max... Drew
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