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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!howland.erols.net!www.nntp.primenet.com!nntp.primenet.com!nntp.uio.no!hermod.uio.no!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!not-for-mail From: sthaug@nethelp.no (Steinar Haug) Newsgroups: comp.unix.bsd.freebsd.misc,comp.unix.bsd.misc Subject: Re: 100Base-TX: where's the bottleneck? Date: 04 Nov 1996 18:31:36 GMT Organization: Nethelp Consulting, Trondheim, Norway Lines: 25 Message-ID: <55lcq8$ag@verdi.nethelp.no> References: <327D4EE8.2D@cplabs.com> <55jkrt$7jc@cynic.portal.ca> NNTP-Posting-Host: aun.uninett.no In-reply-to: cjs@cynic.portal.ca's message of 3 Nov 1996 18:36:45 -0800 Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:30635 comp.unix.bsd.misc:1429 [Curt Sampson] | > I wrote a simple code to test our fast ethernet performance, | >but I didn't get the throughput I expected. The test evironment is | >just two Pentium-133 with 3c905 Fast EtherLink XL PCI adapter and | >3com 100Mb stackable hub on the network. | >... | > The problem is the speed is only 20Mb/s, it seems too low as | >it is 100Mb network. | | The problem is most likely in the drivers. As I recall, the FreeBSD | driver doesn't do DMA on those cards. | | A couple of people are talking about doing a DMA driver for NetBSD; | if you or anyone you know is interested in working on a version | that would work under NetBSD and FreeBSD, drop me a note. | | BTW, you can use a program called `netperf' to test your performance | instead of going to the trouble of writing your own code. netperf and/or ttcp are strongly suggested if you want to test network performance. Btw, I have measured 79 Mbps between two P133s using the SMC Etherpower 10/100 card, and a crossover cable. And FreeBSD, of course :-) Steinar Haug, Nethelp consulting, sthaug@nethelp.no