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

[Cyril]

Follow-up Comment #3, bug #34176 (project lwip):

Well, since we had another bug (EMSGSIZE) that required patching, and a buggy
ethernet switch, I've tried many things to solve this and finally it works.

I'm afraid I can't really say what solved the issue, but I've definitively
disabled the low water test, patched the code for fixing EMSGSIZE code, and
changed the ethernet switch.

When using these parameters, it's also working:
#define TCP_SNDLOWAT      2 * TCP_MSS + 1
#define TCP_SNDQUEUELOWAT 5

Seems like that, even with new parameters, in case of packets loss, lwIP
perform worst than Win32 / Linux IP stack, and transmission eventually succeed
after few minutes (!), while a PC on the same (faulty) ethernet switch works
in decent time.

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