Greetings: You might try visiting the Novell listserv archives and searching on "3300" ...http://lsv.syr.edu/archives/novell.html There have been extended discussions there over the years about problems with 3300 switches and 3c90x NICs. Many of the problems relate to exactly what you're describing. For whatever it's worth, I wouldn't own a 3Com switch.... ....bill sneed, prospect, maine.... Johannes Ballé wrote: > > Hello everybody, > > I have a strange problem with two 3c905b NICs and a 3Com Switch > 3300. The two NICs belong to a file server and a web server. > > The thing is, when I test the network speed on the file server with > "iptraf", it never gets above about 8 or 9 Mbit/s, no matter how > much load I put on it. (In order not to confuse network bandwith > with filesystem bandwith, I also tried to netcat /dev/zero from the > file server to the webserver and vice versa, but with the same > results.) > > The switch as well as the NICs were set to auto-detect, so I tried > setting all of them explicitly to 100Mbit/s full duplex (I set the > switch via telnet, and the nics by booting into dos and running the > 3com tool), but it didn't work either. > > Cable length from the web server to the switch to the file server is > approx. 5 metres, so that cannot be the problem either. > > I don't get any error messages; it seems to work all fine if you just > look at the logs. But the throughput is just too slow if you figure > that the file server is running samba, sometimes serving up to 30 > NT workstations at once with multimedia data. Some of our > applications seem to hang because the throughput is too slow, so I > need to find some kind of solution. > > I'm running Linux 2.2.18 (with no patches installed) on both of the > machines. I compiled the 3com driver as a module. > > I hope someone at least has an idea where I could look. > > Thank you for your attention. > > Johannes Ballé > Gymnasium zum Altenforst, Troisdorf > Germany > > - > : send the line "unsubscribe linux-net" in > the body of a message to majordomo@vger.kernel.org - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org
