Internet transport: A more performant, more robust, more reliable TCP : Improving performance

Improving performance
Internet transport: A more performant, more robust, more reliable TCP

Authors : Mohamed BOUCADAIR, Christian JACQUENET

Review date: August 24, 2021 | Lire en français

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6. Improving performance

6.1 Option Window Scale (WS)

The original TCP specification provided a 16-bit coded field ("Window") to indicate the size of the Receive Window (RWIN) to the remote terminal. The direct implication of this choice on the performance of a TCP connection is that a TCP client can only send a maximum of 65 kilobytes (2 ¹⁶ ) without acknowledgement. This window size limits the throughput of a TCP connection transported over modern networks.

Let's consider the first example of a terminal with a bandwidth of 6 Mbps. Let's also assume that the RTT (Round Trip Time) observed when communicating with the remote terminal is 100 ms. The theoretical maximum volume of data that the terminal can...

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