I keep forgetting that I can't include images. <https://www.dropbox.com/s/b9sbe4cbh3mddo4/buffer_vs_throughput.jpg?dl=0> Here it is. <https://www.dropbox.com/s/b9sbe4cbh3mddo4/buffer_vs_throughput.jpg?dl=0>
I'm afraid there's not much of any knee in this curve. By the way, CPU was almost unaffected. Actually it improved slightly, from 208% at 512 byte buffer, to 195 for buf=2048 to 191 for buf=3072 and above.
