From owner-freebsd-net@FreeBSD.ORG Mon May 5 15:14:03 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D6AB2106566C for ; Mon, 5 May 2008 15:14:03 +0000 (UTC) (envelope-from fullermd@over-yonder.net) Received: from thyme.infocus-llc.com (server.infocus-llc.com [206.156.254.44]) by mx1.freebsd.org (Postfix) with ESMTP id A8CA28FC14 for ; Mon, 5 May 2008 15:14:03 +0000 (UTC) (envelope-from fullermd@over-yonder.net) Received: from draco.over-yonder.net (adsl-147-233-204.jan.bellsouth.net [72.147.233.204]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by thyme.infocus-llc.com (Postfix) with ESMTP id 4CF0337B46B; Mon, 5 May 2008 09:49:28 -0500 (CDT) Received: by draco.over-yonder.net (Postfix, from userid 100) id CC75561C41; Mon, 5 May 2008 09:49:27 -0500 (CDT) Date: Mon, 5 May 2008 09:49:27 -0500 From: "Matthew D. Fuller" To: Igor Zinovik Message-ID: <20080505144927.GW67042@over-yonder.net> References: <20080505114938.GA34390@zinovik.kpsu.local> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080505114938.GA34390@zinovik.kpsu.local> X-Editor: vi X-OS: FreeBSD User-Agent: Mutt/1.5.17-fullermd.4 (2007-11-01) X-Virus-Scanned: ClamAV version 0.93, clamav-milter version 0.93 on thyme.infocus-llc.com X-Virus-Status: Clean Cc: freebsd-net@freebsd.org Subject: Re: Trying to find source of collisions X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 May 2008 15:14:03 -0000 On Mon, May 05, 2008 at 03:49:38PM +0400 I heard the voice of Igor Zinovik, and lo! it spake thus: > > Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll > ed0 1500 00:80:48:c6:a1:82 35885806 4 23583716 0 > 134590 ... > > So i have three questions: > 1. What can cause such big collisions number? Bad UTP cable? Bad > NIC? Misbeheaving switch? That's not a particularly big number; it's half a percent of your output packets. That probably doesn't have a measurable effect on your throughput or latency. Now, that said, if you have a switch, you probably SHOULD be running full-duplex, in which case you won't have collisions. But you've got an ed card; some of those may be old enough to not handle FDX. > 2. Ierr -- seems that some input errors. What are these errors and > what can cause them? Cable troubles, NIC troubles, etc. [Un]plugging the cable can cause it. Some forms of on-wire data corruption could cause it. You've got 4 of them, over 36 million input packets. Don't worry about it. -- Matthew Fuller (MF4839) | fullermd@over-yonder.net Systems/Network Administrator | http://www.over-yonder.net/~fullermd/ On the Internet, nobody can hear you scream.