Date: Tue, 08 Aug 2000 10:37:44 -0400 From: System Administrator <admin@chemcomp.com> To: dg@root.com Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Ethernet "long event" error frames with FBSD machines Message-ID: <39901B38.52F27A68@chemcomp.com> References: <200008072123.OAA04143@implode.root.com>
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Man, that was it! The darn switch is not full-duplex!!! You guys are the best, thanks! David Greenman wrote: > > Sounds like the duplex is set wrong. Try setting both sides for 10/full. > > -DG > > David Greenman > Co-founder, The FreeBSD Project - http://www.freebsd.org > Manufacturer of high-performance Internet servers - http://www.terasolutions.com > Pave the road of life with opportunities. > > >I have a few FreeBSD machines installed on our local network here, and > >they seem to perform very badly when doing large TCP transfers (e.g. > >FTP). All machines are connected on a 10baseT/UTP network using a switch > >(3Com SuperStackII Desktop Switch). But tests using nttcp give me > >readings that are quite bad. The maximum bandwidth I can reach using TCP > >is 1Mb/s. UDP tests are performing a lot better, giving 9 to 10Mb/s > >transfers. > > > >After investigation on the switch's console, I see that the 3 FBSD > >machines that I have on the network generate "long events" error that > >are described in 3com's manual as: > > > >Late Events: This counter is incremented by one > >each time a collision occurs after the valid packet > >minimum time. A late event is an out- of- window > >collision that may occur if your Ethernet LAN > >exceeds the maximum size as defined in the IEEE > >standard. A late event is also counted as a collision. > > > >I seem to be missing something here. No other machine on our network > >behave so badly. I would really like to have advice on this, because it > >may be the turning point of the mere presence of FreeBSD on our network. > >I cannot reproduce the behavior on any other machine that FreeBSD > >machines. > > > >What follows is the examples of the tests I ran, snapshot of the > >Switch's console and my current kernel config. I run > > > >FreeBSD sky.chemcomp.com 4.0-RELEASE FreeBSD 4.0-RELEASE #8: Mon Aug 7 > >12:25:44 EDT 2000 root@sky.chemcomp.com:/usr/src/sys/compile/SKY > >i386 > > > >on all machines. > > > >Thanks, > > > >A. <snipped> -- Antoine Beaupre System Administrator Chemical Computing Group, Inc. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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