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 (2¹⁶) 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 send without acknowledgement is :

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Improving performance