High load - lost network

[Wojciech Puchar]

>>  em0: link state changed to DOWN
>>  em0: link state changed to UP
>>  em0: link state changed to DOWN
>
> 	Have you double-checked the hardware?  (Includes the cable
> connection.)  The "em" driver has a very good reputation and others
> - includong myself - use it under siilar load profiles with no
and including myself.

intel card+em driver are perfect.

this
>>  em0: link state changed to UP
>>  em0: link state changed to DOWN

suggest switch and/or cable problem.