Date: Sat, 19 Oct 2002 12:43:40 -0700 From: "Greg Smith" <freebsd_mail@myrealbox.com> To: freebsd-mobile@FreeBSD.ORG Subject: Re: 100 Mbit/s is (a lot) slower than 10 Mbit/s Message-ID: <200210191243400305.4E2F46AF@smtp.myrealbox.com> In-Reply-To: <20021019211728.B55151@tols.org> References: <20021019210804P.hanche@math.ntnu.no> <20021019211728.B55151@tols.org>
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On Sat, Oct 19, 2002 at 09:08:04PM +0200, Harald Hanche-Olsen wrote: > I have a Linksys ethernet card in my laptop. It can to 10 or 100 > Mbit/s. But when it's in 100 Mbit/s mode, transfers into the laptop > are lots slower than at 10 Mbit/s, at least as long as the sender is > on the same local net and has a 100 Mbit/s interface. > > The reason is obvious enough: Snooping on the ethernet traffic reveals > that packets are lost, with frequent timeouts and waits for > retransmissions as a result. The timeouts are easily visible by > watching the blinkenlights on the dongle. I am assuming this is a > result of the Linksys' puny buffer being overrun, perhaps due to the > bandwidth from the PCMCIA slot to the CPU not being big enough to > cope. : > PS. If the ethernet cable or dongle is disconnected for any reason, > the laptop hangs until I lean on the power button. Very annoying. I don't know if this helps or not, but those Linksys cards are funky. I once tried to connect two of them (in Windows machines) with a crossover cable, and they went into an auto-sensing death spiral. They would go up and down every second or so, with a nice light show on the dongles. Even the Linksys website acknowledged this "feature". Perhaps there is a conflict with an auto-sensing hub/switch at the office? Greg To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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