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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!hobyah.cc.uq.oz.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!news.hawaii.edu!ames!usenet.kornet.nm.kr!ns.etri.re.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.cais.net!news.jsums.edu!gatech!news.mathworks.com!zombie.ncsc.mil!cs.umd.edu!mojo.eng.umd.edu!hecate.umd.edu!research-01.ski.mskcc.org!news.tcst.com!news.spectrum.titan.com!news.onramp.net!zdc!news1.noc.netcom.net!noc.netcom.net!tweety.uscs.com!news From: scotte@center.uscs.com (L. Scott Emmons) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: FreeBSD Losing to Linux - Please Help Date: 04 Apr 1996 16:34:39 GMT Organization: U.S. Computer Services Research Center, El Dorado Hills, CA Lines: 32 Message-ID: <SCOTTE.96Apr4083440@odie.center.uscs.com> References: <4ju4rb$67q@post.gsfc.nasa.gov> NNTP-Posting-Host: odie.center.uscs.com To: kjeffers@nastg.gsfc.nasa.gov (Karen Jefferson x2857) In-reply-to: kjeffers@nastg.gsfc.nasa.gov's message of 3 Apr 1996 15:18:03 GMT In article <4ju4rb$67q@post.gsfc.nasa.gov> kjeffers@nastg.gsfc.nasa.gov (Karen Jefferson x2857) writes: > Although our preference had been to use FreeBSD, the UDP performance > was terrible (200 Kbps over Ethernet), and we kept getting ENOBUF > errors which makes FreeBSD an unacceptable choice. Are you 100% positive it's the O/S and not your PC hardware, NIC, or configuration? Is TCP performance acceptable (i.e. are you postive it's attributable directly to UDP?) I just did some simple and nonconclusive tests and by using different hardware the difference was 10-fold. I transfered a fairly large (3Mb) file via NFS and here's what I got: CPU Memory NIC Xfer Rate ====== ====== ============== ========= 386/33 8Mb 3C503 (8 bit) 100 KBps 486/66 8Mb 3C509 (16 bit) 950 KBps Again, this is far from any sort of conclusive test, and it ignores the whole TCP vs. UDP issue, but it shows what a difference the hardware makes. Both systems are running FreeBSD 2.1 (Jan 1996 CD). I suspect that changing out the O/S is not going to help one bit, but you certainly can try to do so and see what happens. Good luck, -- __________________________________O-___________________________________ L. Scott Emmons |CableData R&D Center - El Dorado Hills, CA, USA (916)939-6088 |>> Standard disclaimer applies. Views are my << scotte@center.uscs.com |>> own, not those of U.S. Computer Services. <<