> So, I built a new kernel.
> 
> BAM!  ray0 gets 10-50 dup packets back per packet it should get.

You're using cardbus, right? Have you tried setting mem8=1 in pccbb.c?
(see <http://mail-index.netbsd.org/current-users/2000/01/27/0013.html>)
That seems to do the trick for me...

Is anyone looking into this, btw? I saw some talk about mem8 on
tech-kern, but those messages seemed to be about PCMCIA rather than
Cardbus, but maybe it's all the same :) In any case, the problem is
still around...