em(4) stops forwarding

[MonkeyBrains]

Michal Mertl wrote:
> >>

> > >>>Hello,
> > >>>
> > >>>I've been running CURRENT for long time and never experienced problem
> > >>>with the built-in em(4) card before. Recently (I first noticed it on Jan
> > >>>24) the card has stopped working several times. Nothing gets into the
> > >>>log file. Carrier is still detected properly but no data is exchanged.
> > >>>Ifconfig up/down doesn't help but kldunload/load does. When I run
> > >>>tcpdump I don't see any packet coming in but I see some outgoing.


I had this same problem with the em driver last month.  Traffic would 
just stop on a router (doing about 60Mbp) and I couldn't figure out what 
was wrong.  This would repeat every 14 days or so.  I never figured out 
what the problem was, but I did recompile the kernel to do 'polling'.
(read the man page on polling).

Rudy