Date: Tue, 01 Jun 1999 09:37:26 +0200 From: sthaug@nethelp.no To: maret@axis.de Cc: wpaul@skynet.ctr.columbia.edu, hackers@freebsd.org Subject: RE: xl driver for 3Com Message-ID: <95577.928222646@verdi.nethelp.no> In-Reply-To: Your message of "Tue, 1 Jun 1999 08:58:30 %2B0200 " References: <91DA20EC3C3DD211833400A0245A4EA9BA0E4F@erlangen01.axis.de>
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> I don't think that so many collisions are normal! I think there is a > problem, because at work we nearly only use 3COM 100 Mbit cards and > don't have much collisions. Even under high load! Collisions on half-duplex Ethernet are *normal*. Get used to it. Collisions is the standard flow control mechanism for half-duplex Ethernet. The amount of collisions you get depend on the cards used, the amount of traffic, and several other things. The amount of collisions is also not very interesting - the amount of *traffic* is. If you connect two hosts to a hub and run ttcp, to push a lot of traffic between them, you're very likely to get a 50% collision rate - with only two hosts. This is because *every* ack collides with a normal full sized packet. This is also perfectly fine and healthy. What you want to watch out for, is: - Late collisions (these are *not* normal) - Collisions when you think that the link is in full duplex mode. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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