Date: Fri, 13 Mar 1998 19:29:24 -0800 From: David Greenman <dg@root.com> To: Karl Denninger <karl@mcs.net> Cc: mika ruohotie <bsdhack@shadows.aeon.net>, hackers@FreeBSD.ORG Subject: Re: "Best" Fast Ethernet Card Message-ID: <199803140329.TAA29649@implode.root.com> In-Reply-To: Your message of "Fri, 13 Mar 1998 14:17:11 CST." <19980313141711.30263@mcs.net>
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>Note that the Pro/100+ *AS WELL AS* the newer SMC cards have serious trouble >with TYN EISA/PCI motherboards when run in 100BaseT mode. It appears that >the motherboard is unable to keep up *on receive* with the data stream; >the result is a lot of input errors and horrible performance. Downshifting >those to 10Mbps fixes that (but obviously negates the point of a fast >ethernet card). The same problem does *NOT* show up on the Natoma >motherboards. Sounds like an older Orion chipset with the PCI write buffer bug. Maximum throughput will be about 4.2MB/sec on those - far less than the 10MB/sec that is required for fast ethernet. The Orion 'C' stepping and Natoma do not have this problem. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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