From owner-freebsd-current@FreeBSD.ORG  Sat Nov 15 18:43:38 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 5F4B216A4CE
	for <freebsd-current@freebsd.org>;
	Sat, 15 Nov 2003 18:43:38 -0800 (PST)
Received: from server.vk2pj.dyndns.org
	(c211-30-75-229.belrs2.nsw.optusnet.com.au [211.30.75.229])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 1CFFE43FBF
	for <freebsd-current@freebsd.org>;
	Sat, 15 Nov 2003 18:43:37 -0800 (PST)
	(envelope-from peterjeremy@optushome.com.au)
Received: from server.vk2pj.dyndns.org (localhost.vk2pj.dyndns.org
	[127.0.0.1])hAG2hRJD027063;	Sun, 16 Nov 2003 13:43:27 +1100 (EST)
	(envelope-from peter@server.vk2pj.dyndns.org)
Received: (from peter@localhost)
	by server.vk2pj.dyndns.org (8.12.9p1/8.12.9/Submit) id hAG2hQ7v027062;
	Sun, 16 Nov 2003 13:43:26 +1100 (EST)
	(envelope-from peter)
Date: Sun, 16 Nov 2003 13:43:26 +1100
From: Peter Jeremy <peterjeremy@optushome.com.au>
To: Ceri Davies <setantae@submonkey.net>, freebsd-current@freebsd.org
Message-ID: <20031116024326.GC74756@server.vk2pj.dyndns.org>
References: <20031115164720.I13393@hewey.af.speednet.com.au>
	<20031115071458.GA29973@lizzy.catnook.com>
	<20031115202744.GG60410@submonkey.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20031115202744.GG60410@submonkey.net>
User-Agent: Mutt/1.4.1i
Subject: Re: dc still reporting collisions
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 16 Nov 2003 02:43:38 -0000

On Sat, Nov 15, 2003 at 08:27:44PM +0000, Ceri Davies wrote: These
>probably are actual collisions though.  The OP's point is that
>collisions are supposed to be impossible on a full duplex link,
>whereas in your situation they aren't.

The collision mechanism is used for flow control on full-duplex links.
A very high collision rate would normally indicate a half/full duplex
mismatch.  A low collision rate would normally indicate that the switch
can't handle the load and is throttling back your system.  (Other options
are broken NICs and/or cables).

Peter