Hi, 

   I just build a i386 NetBSD 1.2 system and I am expericening a 
problem where the mbuf's blow out to a large number and stay there. 
As a result, I loose network connectivity.

  This typically happens when the sendmail queue runs. 

I am using a 3Com 3c590 PCI ethernet card.

ifconfig'ing ep1 down and then up clears things up and the interface 
is usable again for a little while.

I have tried setting MAXUSERS to 128 and build another kernel, checked
out the socket.h SOMAXCONN which was big enough at 128 already.

I have seen reference to an 'options NMBCLUSTERS=2048' that I haven't
tried and to a patch that fixes the transmit interupt on for for
3c59x/3c90. Are these relevant ? Would increasing the mbufs to a very
large number help ?

Anyone know of a fix ? Is this a known problem ? Is their a patch ?

Thanks
Harry