Date: Sun, 19 Sep 1999 22:11:47 +0100 From: Scott Mitchell <s.mitchell@computer.org> To: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> Cc: FreeBSD-mobile@FreeBSD.ORG Subject: Re: Recommendation for a GOOD 100 MBit Ethernet card wanted Message-ID: <19990919221147.39117@lungfish.freeserve.co.uk> In-Reply-To: <19990914090402.A63360@internal>; from Andre Albsmeier on Tue, Sep 14, 1999 at 09:04:02AM %2B0200 References: <19990905192333.A34635@internal> <Pine.BSF.4.10.9909071535540.55118-100000@resnet.uoregon.edu> <19990908064231.A1059@internal> <19990913003148.29772@lungfish.freeserve.co.uk> <19990914090402.A63360@internal>
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On Tue, Sep 14, 1999 at 09:04:02AM +0200, Andre Albsmeier wrote: > Of course, I don't expect 11.8 MBytes/sec as I get when two Intel Etherexpress > PCI cards are talking to each other on FreeBSD :-). But I was quite disappointed > of the 1.2MB/sec with PCMCIA. However, in the meantime I managed to test > the same machine under Crap95 and got similar results. It really seems to > be some hardware limit. > > I also got an Intel Etherexpress 100MBit ISA (yes, ISA) and this one > does about 4-5 MBytes/sec under Crap95. Someone else told me that PCMCIA > would be faster than ISA so I expected a bit more... Guess the ISA card is doing a real shared-memory or DMA arrangement -- with the Xircom card at least the data has to be transferred (16-bit) word at a time. So the driver spends most of it's time in a tight loop waiting for the next byte to arrive :-( I always figured that PCMCIA was roughly equivalent to ISA in terms of performance -- the PCMCIA controller would presumably have been bridged off of the ISA bus in pre-PCI laptops. Someone with some real documentation will know how it actually works though. Cheers, Scott -- =========================================================================== Scott Mitchell | PGP Key ID | "Eagles may soar, but weasels Cambridge, England | 0x54B171B9 | don't get sucked into jet engines" s.mitchell@computer.org | 0xAA775B8B | -- Anon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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