Large TCP send socket buffer optimizations

[Andrew Gallatin]

Andre Oppermann writes:
 > This patch solves the problem by maintaining an offset pointer in the socket
 > buffer to give tcp_output() the closest mbuf right away avoiding the traversal
 > from the beginning.
 > 
 > With this patch we should be able to compete nicely for the Internet land
 > speed record again.

Great news.  I will test soon.

Have you found the bug which makes a freebsd sender spew
duplicate acks?  This will have a negative affect on
any benchmarks..

Drew