My Dell SC-420 has a Broadcom BCM-5751 adapter....any large-ish transfers from the host to a vmware guest is extremely slow, when it works at all!
These two posts point to issues with the vmware adapters and the tg3 broadcom driver:
http://www.vmware.com/community/thread.jspa?messageID=687712
http://www.vmware.com/community/thread.jspa?messageID=551754
They also point to the solution which is:
ethtool -s eth0 autoneg off speed 100
ethtool -K eth0 sg off rx off tx off tso off
That seemed to fix it....
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