[lwip-devel] [bug #34176] select after non-blocking send times out

[Simon Goldschmidt]

Follow-up Comment #7, bug #34176 (project lwip):

Right. What's missing is limiting it to "TCP_SND_BUF - 1". However, that's
only a problem for the default value of TCP_SND_BUF (2 * TCP_MSS). And I think
we should change that default value to "4 * TCP_MSS" as with 2 * mss and a
remote host implementing delayed ACKs, you break down from a sliding window
into a ping-pong (send 2 segments, wait for ACK). It doesn't break things, but
it slows down transmission.

Anyway, I've added a MIN(old-value, TCP_SND_BUF - 1), which should fix
things.

Thanks for checking this.

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