em(4) stops passing data

[Claus Guttesen]

> > If possible, try the version of the em driver that is in RELENG_6 or
> > CURRENT.  Not sure why the intel people didnt MFC it, but it supposedly
> > has
> > a number of bug fixes.
> 
> That driver seems to have too many changes to easily be backported onto
> RELENG_5. [1]
> 
> I have however already tried the latest version of the driver (3.1.10)
> from the Intel web site also without success.

I applied the em-patch that was announced a few days ago to two
servers with an Intel em-gbit-nic resetting during load. It's only
been running for one day so I don't know whether my problem is gone.
But so far I haven't seen any regression. The servers are connected to
a Dell-switch.

Applied to RELENG_5_4 and the i386- and amd64-port.

regards
Claus