In article <199804160042.RAA15719@shell9.ba.best.com>,
	Chuck <nospam@best.com> writes:
> Finally, I get these errors, only on de0:
> 	Apr 15 16:40:16 smdls3 /netbsd: de0: abnormal interrupt: transmit
> 	  underflow (raising TX threshold to 96|256)
> 	Apr 15 16:40:17 smdls3 /netbsd: de0: abnormal interrupt: transmit
> 	   underflow (raising TX threshold to 8|512)
> 	Apr 15 17:33:06 smdls3 /netbsd: de0: abnormal interrupt: transmit
> 	   underflow (raising TX threshold to 1024)
> 	Apr 15 17:33:06 smdls3 /netbsd: de0: abnormal interrupt: transmit
> 	   underflow (switching to store-and-forward mode)
> What's going on here ...

Your system seems to be too slow to fill the FIFOs fast enough.

> ... and is there anything to be done to "fix" the problem?

Replacing my 486DX133 with a Pentium 100 solved the problem for me.

-- 
Matthias Scheler                                http://home.owl.de/~tron/