Date: Mon, 5 May 2008 09:49:27 -0500 From: "Matthew D. Fuller" <fullermd@over-yonder.net> To: Igor Zinovik <zinovik@kspu.karelia.ru> Cc: freebsd-net@freebsd.org Subject: Re: Trying to find source of collisions Message-ID: <20080505144927.GW67042@over-yonder.net> In-Reply-To: <20080505114938.GA34390@zinovik.kpsu.local> References: <20080505114938.GA34390@zinovik.kpsu.local>
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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 <Link#1> 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.
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