For each of 100 transfers, we recorded the rtt of the syn-ack round, the request-reply round, and the next three data rounds.
In general, the syn-ack round sees the shortest rtts because the packet sizes are minimal and there is no application-level processing at the server.
The request-reply round takes the longest, and has the highest variability, because the application-level processing at the server is synchronous and may require disk access. Subsequent data rounds happen at network speed because disk latency is hidden by buffering.
(above)
(above)
(above)
(above)
(above)
(above)
(above)
(above)
(above)
(above)
(above)
(above)
(above)