Date: Wed, 9 Oct 1996 20:26 EDT From: Barney Wolff <barney@databus.com> To: hardware@FreeBSD.org Subject: Re: Poor SMC Etherpower 10/100 transfer rates Message-ID: <325c45a40.4f38@databus.databus.com>
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Is it possible the card is trying to do full-duplex Ethernet? I have an odd data point to contribute. I have an SMC 9332 in an NT box. NT allows 10 Mb, 100 Mb and 100 Mb full-duplex for it. On a 100 Mb SMC TigerHub 100, talking to a freebsd 2.1.5-release box with an Intel Pro-100B, I found that the SMC9332 had to be set in non-full-duplex mode or performance would be just awful. I'm not sure whether that means that the hub does not support full-duplex, or freebsd with the Intel doesn't, or both. Since full-duplex 10 Mb does exist (I think) I wonder if the card thinks that's what it should be doing. Where can I RTFM on flag settings for NICs (is that what link<n> does)? With the SMC set properly, I get 6-7MB/sec ftp rate between these two P6/200 boxes on the 100Mb hub. But even then, I often see a pause of something like a second just after the start of the transfer. Can't tell if that's caused by packet loss or what. I wondered about MTU discovery, but as I read the code it starts with the MTU of the interface, which is 1500. Barney Wolff <barney@databus.com>
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