[lwip-devel] [bug #27771] Silly-window-avoidance shrinks window unnecessarily

[Simon Goldschmidt]

Follow-up Comment #3, bug #27771 (project lwip):

What's happening in Jan's trace is:

- lwIP announces wnd of 512
- lwIP receives 10 bytes of data
  - internal rcv_wnd is now 502
  - calls recv callback
    - recv callback calls tcp_recved
    - internal rcv_wnd is now 512
    - recv_ann_wnd is still 502
- lwIP sends ACK with an announced wnd of 502

This means the window is decreasing although it wouldn't have to: if the
window size we have was OK to be announced before receiving, it should be OK
to be announced after receiving, shouldn't it?

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