Nagle Algorithm

Posted by AJ × 10:18

• Situation: user types 1 character at a time

– Transmitter sends TCP segment per character (41B)

– Receiver sends ACK (40B)

– Receiver echoes received character (41B)

– Transmitter ACKs echo (40 B)

– 162 bytes transmitted to transfer 1 character!

• Solution:

– TCP sends data & waits for ACK

– New characters buffered

– Send new characters when ACK arrives

– Algorithm adjusts to RTT

• Short RTT send frequently at low efficiency

• Long RTT send less frequently at greater efficiency

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