[lwip-devel] [bug #20287] tcp_output_nagle sends too early

[Simon Goldschmidt]

Follow-up Comment #10, bug #20287 (project lwip):

Imagine you are sending 500 byte chunks, have no unsent queue and some
segments in unacked (with TCP_MSS of 1460):

tcp_output_nagle wouldn't send until the first segment is filled (in this
example, 1000 bytes in a segment, then a next segment would be created).

At this point, after having enqueued the 3rd segment, tcp_output_nagle would
really call tcp_output, which would then send as much as it can, resulting in
sending 2 segments: the first with 1000 bytes and the second with 500 bytes. A
proper implementation would hold back the second segment until it is filled.

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