[tulip-bug] Capture Effect - a value-added feature and options=14

[John William]

On Sun, 1 Oct 2000, Junjiro Okajima wrote:
<snip>
>>After loading tulip module and starting network, of course tulip is
>>running, but the speed is very slow. I checked with ftp'ing 16M bytes
>>file and the result is here.
>>
>> >From tulip	200 - 300 Kbytes/s
>>To tulip	5 - 10    Mbytes/s
>
>This is what you should expect with a duplex mismatch.
>"Don't do that."

It might not be that simple.

I am having a very similar problem with my tulip clone (FA310TX) card. My 
card is connected to a 10/100 switch as well. Both the switch and the card 
indicate full duplex. The "tulip-diag" utility says the card is running FD. 
But yet I still get a lot of frame errors on high receive load (none on 
outgoing load). In my case, I get ~5.5MB/s from the card and 50-150K/s to 
the card. Forcing half duplex on the card appears to work, in that the card 
and switch indicate half duplex mode. The transfer rate problem (and framing 
errors) doesn't change, however.

Maybe it's a bad interaction with the FA310TX card, but I can't believe 
nobody would have noticed by now (since it is a fairly popular card). But in 
any case, it's pretty easy to reproduce here so I think it is a driver 
problem. If nothing else, maybe there is a problem with the link not being 
set correctly even though the status lights and "tulip-diag" indicate 
full-duplex? Or maybe a driver bug since I am getting framing errors in both 
full (?) and half duplex modes.

- John

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