tg3 is a broadcom driver module. What NICs is this server running with? Did you like install it with a custom IBM ISO?
Try using a more recent tg3 driver such as this version:
You would need to build a custom ISO with this updated driver if the server doesn't boot at all to update it afterwwards. You can use this fine tool to do that in an easy fashion: http://www.v-front.de/p/esxi-customizer.html