Date: Tue, 26 Oct 1999 17:21:54 -0700 From: David Greenman <dg@root.com> To: "Craig Critchley" <craigc@nwlink.com> Cc: "Garrett Wollman" <wollman@khavrinen.lcs.mit.edu>, net@FreeBSD.ORG Subject: Re: FTP Net Performance Message-ID: <199910270021.RAA23991@implode.root.com> In-Reply-To: Your message of "Tue, 26 Oct 1999 17:04:05 PDT." <1f6601bf200e$c8e476b0$0201010a@fuzzer.com>
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>Thanks. I guess I need to track down the thesis and give it a read - the >graphs themselves are relatively uninteresting - flat lines at large >negative numbers. (This is a small enough network that I can make sure >there is more or less nothing else happening when I try to FTP something.) > >I got conflicting suggestions from a couple people about whether to use full >or half-duplex. The device defaults to half-duplexing, which seems to be >correct for a hub (the two machines do not have the switch between them as >they are both on the 100Mb segment). I'm not too concerned about 50Mb vs. >100Mb, or even 10Mb vs. 100Mb - I'm getting barely 100kilobits. Three >orders of magnitude difference. But uploading to the BSD machine goes full >speed. (For the record, ifconfig and the hub blinkies agree that I have a >100Mb link.) > >Looking at netstat -i, I see that I'm getting Oerrs of about 15% of Opkts, >but no Ierrs. There is an inconsequential number of collisions. Perhaps >the error rate is to blame for the problem. What sorts of things do these >errors represent? You shouldn't be getting any output errors - that is definately indicating a problem. Have you tried replacing the cable? What sort of motherboard is the card plugged into? -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org Creator of high-performance Internet servers - http://www.terasolutions.com Pave the road of life with opportunities. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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