Date: Fri, 25 Feb 2000 01:25:59 -0800 (PST) From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> To: daeron@wit401305.student.utwente.nl (Pascal Hofstee) Cc: wollman@khavrinen.lcs.mit.edu (Garrett Wollman), cwasser@v-wave.com (Chris Wasser), freebsd-current@FreeBSD.ORG Subject: Re: dc0 wierdness with Compex Freedomline Message-ID: <200002250925.BAA69805@gndrsh.dnsmgr.net> In-Reply-To: <20000224231842.B74208@shadowmere.student.utwente.nl> from Pascal Hofstee at "Feb 24, 2000 11:18:42 pm"
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> On Thu, Feb 24, 2000 at 02:07:40PM -0500, Garrett Wollman wrote: > > <<On Thu, 24 Feb 2000 10:21:31 -0700, Chris Wasser <cwasser@v-wave.com> said: > > Assuming you mean ``100BASE-T (half duplex)'' here... This is not > > quite right. In a CSMA/CD medium access protocol, like that used by > > Ethernet, the actual capacity of the link is always(*) somewhat less than > > 100%; the exact value depends on the precise parameters of the > > transmissions at both ends.(**) > > Ok ... we all know what exactly should be theoretical maximum and all ... > but that wasn't exactly my question ... I have having weird problems with > the network performance permanently dropping to below 100 kB/s (while still > in 100 Mbps/FDX). Is there anybody that could give a plausible explanation > for this break-down ? There was a patch of DC21143 chips it seems that has a very strange thermal problem. Can you tell me what your hub link lite is doing when you see this major slow down? If you abort all traffic does the link light keep blinking wildly? If you power the machine down for an hour or so and let everything cool down nice and cool does it seem to work for a longer period of time before the speed drops? If you see any of these symptoms call Kingston tech support, describe the problem to them, ask them for an RMA number :-) What is the date code on your DC21143 chip (I think I am recalling that you said you had a KNE100TX, and I am assuming you do, and that it is of new enough vintage to be the 21143 chip, and that it might be in this same range of chips we had problems with (33% of 4 lots of 20 cards would go to la la land within 1 to 2 hours of being placed into burn in). The problem seems to have started shortly after Intel took over production of the chips from DEC. I have not seen the problem in the last 6 lots of product. -- Rod Grimes - KD7CAX @ CN85sl - (RWG25) rgrimes@gndrsh.dnsmgr.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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