Date: Fri, 06 Dec 1996 20:33:02 +0100 From: Poul-Henning Kamp <phk@critter.tfs.com> To: Greg Lehey <grog@lemis.de> Cc: FreeBSD-current@freebsd.org (FreeBSD current users) Subject: Re: Problems with PLIP driver? Message-ID: <9851.849900782@critter.tfs.com> In-Reply-To: Your message of "Fri, 06 Dec 1996 18:32:46 %2B0100." <199612061732.SAA02168@freebie.lemis.de>
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In message <199612061732.SAA02168@freebie.lemis.de>, Greg Lehey writes: >Some of you will know that I've been having troubles connecting up the >Ethernet board on my new notebook. One of the consequences is that I >have currently connected it to the net via PLIP. On the up side, it >worked like a dream: two ifconfigs (and a LapLink cable), and it was >up. However, there seem to be a few problems: > >1. There seem to be an abnormal number of errors on the line. In the > following, freebie is my FreeBSD machine, and papillon is the > laptop: Well, if there is a significant speed difference between the machines, you will have a problem. >2. There's definitely a bug in the bpf code, causing 100% of all > messages to be reported as invalid. I think I can find that one > by myself. please. I've never got around to licking it definitively. >3. NFS across the link is very poor, and keeps hanging. With TCP > transport, it's bearable. Try either reducing your request size to 1024 or increasing the MTU to 9180. The former is probably the least unhealty (see below). >4. These problems seem to affect the Ethernet link (ep0) as well. > I've had to take it down and up again to get any kind of response, > and ping shows a strange cyclic behaviour. Succesive pings seem > to complete in pairs, with a difference in time of about 1 > second. This only happens after errors on the PLIP interface: The problem is that your speed is probably around 70Kbyte/sec, that means that the cpus are running for 22 msec with irqs disabled. If you increase the MTU, this will increase in a linear fashion of course. I usually use wsize=1024,rsize=1024 on NFS for that reason. >I'm not asking anybody to jump in and fix these problems, but if this >rings a bell with anybody, I'd be grateful for some pointers. You know, it's really just a hack for emergencies and weird circumstances (which I will admit, is a permanent condition for some of us). And as far as I know from you email, you got through on it :-) It works sufficiently well that it is usable, but it is impossible to get it to really work well and preserve a decent transfer-rate. -- Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team. http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox. whois: [PHK] | phk@tfs.com TRW Financial Systems, Inc. Power and ignorance is a disgusting cocktail.
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