[lwip-devel] [bug #27783] Silly window avoidance for small window sizes

[Simon Goldschmidt]

Follow-up Comment #7, bug #27783 (project lwip):

Hm, but that would make it worse for WND==MSS again. Maybe you're right and
sending that many ACKs is OK if the window is that small (since it helps
minimize latencies) - which means leave it as it is.

However, we should document this somewhere and make sure the default
definitions in opt.h are OK:

- opt.h says that TCP_WND must be at least 2*MSS "for things to work well". I
wonder if that's still the case since we changed the ACK mechanism (WND == MSS
works quite well for me). I think we should change that to "This should be at
least 4*MSS for things to work well (otherwise, delayed ACK mechanism won't
work)".

- I think we should change the default definition of TCP_WND from 2048 to
(4*TCP_MSS). That way, the window is automatically adjusted if someone only
defines TCP_MSS (but not TCP_WND) in lwipopts.h.

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