Date: Wed, 03 Feb 1999 11:50:04 +0100 From: Christophe Prevotaux <chris@hexanet.fr> To: FreeBSD Questions <questions@FreeBSD.ORG> Subject: Re: Excessive collisions on Ethernet Message-ID: <36B829DC.20BE712B@hexanet.fr> References: <19990201123740.27312.qmail@alpha.comkey.com.au> <199902011307.FAA02115@implode.root.com> <19990203182043.D1179@freebie.lemis.com>
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Greg Lehey wrote: > > On Monday, 1 February 1999 at 5:06:59 -0800, David Greenman wrote: > >>> Well, the values for freebie are now: > >>> > >>> Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll > >>> ed2 1500 <Link> 00.80.48.e6.a0.61 16493376 34 21501269 0 2326175 > >>> ed2 1500 widecast freebie 16493376 34 21501269 0 2326175 > >>> > >>> Since yesterday, that's 8 million more output packets and 1.3 million > >>> collisions. That suggests that something might be getting worse. > >> > >> Yes, it does look as though it's getting worse. You may indeed > >> have a fault somewhere. I'd certainly check the cables first, > >> and try swapping some of them around before pulling cards from > >> machines. (I have to pull video cards from five machines > >> tomorrow to swap them for something that works with FreeBSD, so > >> I'm a bit jaundiced about pulling cards at the moment :-) ) > > > > Anything less than 50% collision rate is okay and doesn't reduce the > > throughput significantly. All of the numbers below are in the noise. > > You mean it's the noise that's causing the collisions? > > Seriously, it's clear that it's not affecting the performance, though > that surprises me; how long does a board hold off after a collision? > I haven't been able to find that info anywhere, but I once worked for > a nameless computer manufacturer whose net had about 50% collisions, > and the throughput was terrible. > > The real question was: why is this happening? I still suspect that > it's trying to tell me something, but I haven't a good feeling for > what. I have had the same problem , and it seems to be related to the fact that some ethernet cards ( among which mine ) are not autodetect for the port ( RJ45 or BNC ), try putting your machine on BNC and see what happen suddendly all these problems go away ? :)) if so then just take your ethernet card utility disk and switch the port to be used from BNC to RJ45 For info: I am using a <NE2000 PCI Ethernet (RealTek 8029)> -- =================================================================== Christophe Prevotaux Email: chris@hexanet.fr HEXANET SARL URL: http://www.hexanet.fr/ Z.A Farman Sud Tel: +33 (0)3 26 79 30 05 9 rue Roland Coffignot Fax: +33 (0)3 26 79 30 06 BP415 51689 Reims Cedex 2 Use a real OS, use UNIX FRANCE FreeBSD =================================================================== To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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