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Reduce write system calls, thus fewer TCP packets
Do a bit more copying around in user space before handing off the data to the kernel, so that Before this change, one connect, publish and disconnect was 19 packets. After this change, it is 14 packets. Ethernet/IP/TCP overhead is about 66 bytes. So with this change, we use 73% of the bandwidth as before (14*66/19*66 = 0.73).
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