[lwip-devel] [bug #20515] TCP delayed ack does not work as expected

[Kieran Mansley]

Follow-up Comment #20, bug #20515 (project lwip):

The "every 2nd packet" bit should be guaranteed by the calls to tcp_ack() in
tcp_receive().

tcp_recved() will call tcp_ack() only to send a window update in the case
where it would allow the sender to transmit a significant amount more data. 
This window-update-ACK is in addition to the data-path ACKs, so we may still
send more ACKs than is strictly necessary, but I think it should be much
better than before.

Happy to change that function name.



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