Less than 1% performance improvement in a benchmark doesn't justify
the complexity of the patch. Eric's hypothesis was that an unconnected
UDP socket may show issues because of cache misses in look-ups due to
so many different sources. This should be fairly easy to benchmark by
randomly setting source address in your test (IP any and routing my
need to be set appropriately).
With different source addresses, a larger increase is seen here
(633->654Mbps).
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