From owner-freebsd-current Wed Dec 22 11:37:48 1999 Delivered-To: freebsd-current@freebsd.org Received: from apollo.backplane.com (apollo.backplane.com [216.240.41.2]) by hub.freebsd.org (Postfix) with ESMTP id CE72A1501B; Wed, 22 Dec 1999 11:37:45 -0800 (PST) (envelope-from dillon@apollo.backplane.com) Received: (from dillon@localhost) by apollo.backplane.com (8.9.3/8.9.1) id LAA10414; Wed, 22 Dec 1999 11:37:42 -0800 (PST) (envelope-from dillon) Date: Wed, 22 Dec 1999 11:37:42 -0800 (PST) From: Matthew Dillon Message-Id: <199912221937.LAA10414@apollo.backplane.com> To: Brad Knowles Cc: Joe Abley , Poul-Henning Kamp , Garrett Wollman , jlemon@FreeBSD.ORG, freebsd-current@FreeBSD.ORG Subject: Re: Odd TCP glitches in new currents References: <16589.945810831@critter.freebsd.dk> <199912212123.NAA02780@apollo.backplane.com> <19991222200017.A25228@patho.gen.nz> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG :> clueful person bitten by this: :> :> hard-wire your duplex setting on your machine and also on the switch : : If you check and :scroll down to the "Network:" section (from the looks of things, :written sometime back in 1997 or perhaps 1998), you'll see that Matt :has been well aware of this problem for some time. : : That's not to say that he might have forgotten his own advice on :this issue, just that he is (or should be ;-) well aware of it. : : : That said, I have to admit that I have yet to be bitten by this :problem, and I have not (yet) configured machines & switches at this :site to forcibly select a particular media speed and plexicity. : :-- :Brad Knowles : That's less of a problem as boards have started to conform better, but I definitely checked it - full-duplex worked fine (I could push over 15 MBits aggregate). My packet loss occured with both half and full duplex. I finally tracked it down. The loss is occuring in the link between two of my switches. The link goes across my apartment - about 60 feet of Cat-5 cable. That should be well within spec (you are supposed to be able to do 100 meters) but it causes packet loss. The switches autonegotiate full-duplex for the link (and I verified that it's actually running at full duplex), but that's where the packet loss occurs. Very weird. I was finally able to fix it by dropping in a 10BaseT hub to force the switches to negotiate 10BaseT across the link. Maybe my cable is damaged or something. I'll run a second cable to see if that's the problem or whether. The second switch is a LinkSys. I have a D-Link near my servers and a LinkSys near my workstation. -Matt Matthew Dillon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message