Date: Sun, 20 Oct 2002 17:42:08 +0200 From: Harald Hanche-Olsen <hanche@math.ntnu.no> To: freebsd-mobile@FreeBSD.ORG Subject: Re: 100 Mbit/s is (a lot) slower than 10 Mbit/s Message-ID: <20021020174208O.hanche@math.ntnu.no> In-Reply-To: <Pine.BSF.4.21.0210191533200.72873-100000@wonkity.com> References: <20021019210804P.hanche@math.ntnu.no> <Pine.BSF.4.21.0210191533200.72873-100000@wonkity.com>
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+ Warren Block <wblock@wonkity.com>: | As others have mentioned, it sounds like a duplex problem. I experimented on my home network (just my stationary machine and the laptop connected back-to-back via a twisted cable). They were both running half duplex, with the problems I described. When I switched them both to full duplex, the speed went from slow to glacial. Playing with tcpdump shows massive packet loss, where activity happens in burst with up to 5 second pauses in between. Each time the sender receives another ack, it will happily fill up the window with new packets, oblivious to the fact that the receiver has lost more packets further back... | If you still want to experiment with speed: | | 'ifconfig ed0 media 10baseT/UTP' (assuming UTP wiring rather than coax). Thanks. The ed(4) man page does not mention this (the dc(4) one does), and I could have sworn I had tried it anyway and found it not to work. But that was several FreeBSD releases ago, so maybe things have changed, or maybe I just had finger trouble back then. This will probably be my solution at the office. I don't really need 100 Mbit/s access for most of the stuff I do with the laptop anyway. And if I do, I'll go buy a better card. Thanks to all who responded. - Harald To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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