Gigabit Ethernet and Back of the Envelope Calculations

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I ran the test again, I had to use two console windows:

In the first window
pcattcp.exe -r

In the second window
pcattcp -t -f M localhost

results

TCP Transmit Test
  Transmit    : TCPv4 0.0.0.0 -> 127.0.0.1:5001
  Buffer Size : 8192; Alignment: 16384/0
  TCP_NODELAY : DISABLED (0)
  Connect     : Connected to 127.0.0.1:5001
  Send Mode   : Send Pattern; Number of Buffers: 2048
  Statistics  : TCPv4 0.0.0.0 -> 127.0.0.1:5001
16777216 bytes in 0.033 real seconds = 483.56 MB/sec +++
numCalls: 2048; msec/call: 0.017; calls/sec: 61895.551

So, ten years later, we go from 90 MB/sec to 484 MB/sec in loopback ethernet testing. Real world throughput from machine to machine these days in 2015 is about 120 MB/sec max.