From owner-freebsd-hardware Fri Oct 18 09:09:58 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id JAA04209 for hardware-outgoing; Fri, 18 Oct 1996 09:09:58 -0700 (PDT) Received: from saguaro.flyingfox.com (saguaro.flyingfox.com [204.188.109.253]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id JAA04204 for ; Fri, 18 Oct 1996 09:09:55 -0700 (PDT) Received: (from jas@localhost) by saguaro.flyingfox.com (8.6.12/8.6.10) id JAA04414 for hardware@freebsd.org; Fri, 18 Oct 1996 09:07:38 -0700 Date: Fri, 18 Oct 1996 09:07:38 -0700 From: Jim Shankland Message-Id: <199610181607.JAA04414@saguaro.flyingfox.com> To: hardware@freebsd.org Subject: collision count reported by netstat -I? Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk While investigating some network performance problems, I've noticed that the collision count reported by netstat -I for SMC9332DST cards running in 10 Mbit mode tends to be much higher than I would expect. I do not believe I'm dealing with defective cards, as this happens on multiple cards, and on networks that seem to be performing OK. As a specific example, a workstation with one of the SMC cards, located on a moderately busy wire, reports about a 3.5% collision rate (Opackets/Collisions). The principal router on that wire (also a FreeBSD box), sporting a 3C509 card, reports a collision rate of just under 1 in a *millino*. As it happens, virtually all traffic to and from the workstation, plus quite a bit more, passes through the router. Does anyone have any thoughts as to what might be the cause of this huge difference? Jim Shankland Flying Fox Computer Systems, Inc.