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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!news.ecn.uoknor.edu!solace!news.stealth.net!vixen.cso.uiuc.edu!howland.erols.net!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newsfeed.direct.ca!nntp.portal.ca!cynic.portal.ca!not-for-mail From: cjs@cynic.portal.ca (Curt Sampson) Newsgroups: comp.unix.bsd.freebsd.misc,comp.unix.bsd.misc Subject: Re: 100Base-TX: where's the bottleneck? Date: 3 Nov 1996 18:36:45 -0800 Organization: Internet Portal Services, Inc. Lines: 24 Message-ID: <55jkrt$7jc@cynic.portal.ca> References: <327D4EE8.2D@cplabs.com> NNTP-Posting-Host: cynic.portal.ca Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:30551 comp.unix.bsd.misc:1424 In article <327D4EE8.2D@cplabs.com>, Henry Wong <henry@cplabs.com> wrote: > 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. cjs -- Curt Sampson cjs@portal.ca Info at http://www.portal.ca/ Internet Portal Services, Inc. Vancouver, BC (604) 257-9400 De gustibus, aut bene aut nihil.