checksumming benchmark

[pmonta@halibut.imedia.com]

I was curious about how much hardware checksumming would help
(but too lazy to do the actual work).  So this trivial patch,
as suggested by Donald's comment,

			/* Note: checksum -> skb->ip_summed = CHECKSUM_UNNECESSARY; */
+			skb->ip_summed = CHECKSUM_UNNECESSARY;

increases TCP performance from 378 Mbit/sec to 528 Mbit/sec (PII/350,
2.2.2pre).  I suppose the boost would decrease fractionally when the
driver actually does the right thing.

Cheers,
Peter Monta   pmonta@imedia.com
Imedia Corp.
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