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Date:      Fri, 18 Oct 1996 09:07:38 -0700
From:      Jim Shankland <jas@flyingfox.COM>
To:        hardware@freebsd.org
Subject:   collision count reported by netstat -I?
Message-ID:  <199610181607.JAA04414@saguaro.flyingfox.com>

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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.



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