NIC that does TCP/IP checksum on board?

[Jason Saunders]

I saw something in a trade mag about a nic that calculates the TCP/IP
checksum on board, thus freeing up the CPU for other tasks, but I can't
ffor the life of me find it.

I have three questions:

Firstly, is the checksum computation a serious overhead on the CPU?
Secondly, does anyone know who makes it?
Thirdly, is there a Linux driver for it!

Cheers,
Jason
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