DOC: design-thoughts: add diagrams illustrating an rx win groth

Let's just see on a diagram how the receiver can detect that the
window is large enough for the remote sender to fill the link. Here
it seems that a first criterion is that data are accumulating in
the rxbuf, indicating that the next hop doesn't consume them fast
enough. On the diagram it's visible when blue arrows (incoming data)
are more frequent than the magenta ones on average (outgoing data),
which happens when silence moments are less frequent and don't allow
the reader to catch up. It's also visible that there are two phases
alternating in the transfer:
  - measure round trip time (i.e. how long it takes to restart
    sending after a WU was sent after a long silence)

  - measure the lowest rxbuf size during the previous round trip

It's worth noting that a window size change only has *observable* effect
after two RTT: the first RTT is to restart sending (opening or enlarging
the window), the second RTT to measure the lowest rxbuf size over the
period.

By turning the advertised window into an offset and comparing it to
the received quantity, it's possible to measure the RTT of the whole
chain (including the client possibly producing the data). Note that
when multiple streams compete for BW this can become tricky. Limiting
the window to available buffers and counting the number of sending
streams on a connection could work (i.e. split total buffers into
1+#senders, first one being used for tx).

diff --git a/doc/design-thoughts/h2-rx-win.fig b/doc/design-thoughts/h2-rx-win.fig
new file mode 100644 (file)
index 0000000..45e7658
--- /dev/null
+++ b/doc/design-thoughts/h2-rx-win.fig
@@ -0,0 +1,750 @@
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+4 0 0 53 -1 16 6 0.0000 4 105 435 2565 855 WP0 @4\001
+4 0 0 53 -1 16 6 0.0000 4 75 390 2565 1005     => +8\001
+4 1 0 52 -1 16 8 0.4363 4 105 765 9945 4050 WU: win=16\001
+4 1 0 52 -1 16 8 0.4363 4 105 690 9945 1935 WU: win=8\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 1305 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 1485 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 3195 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 3465 -2 = 4\001
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+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 5355 -2 = 4\001
+4 0 0 53 -1 16 6 0.0000 4 105 495 11340 3645 WP1 @12\001
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+4 0 0 53 -1 16 6 0.0000 4 105 435 11340 1710 WP0 @4\001
+4 0 0 53 -1 16 6 0.0000 4 75 360 11340 1860    => +8\001
+4 1 0 52 -1 16 8 0.4363 4 105 765 9945 6480 WU: win=32\001
+4 0 0 53 -1 16 6 0.0000 4 105 495 5220 3690 WP1 @12\001
+4 0 0 53 -1 16 6 0.0000 4 105 495 5220 6165 WP2 @28\001
+4 0 0 53 -1 16 6 0.0000 4 105 435 5220 1620 WP0 @4\001
+4 0 0 53 -1 16 6 0.0000 4 75 390 5220 1770     => +8\001
+4 1 0 52 -1 16 8 0.4363 4 105 765 6795 6300 WU: win=32\001
+4 1 0 52 -1 16 8 0.4363 4 105 765 6795 4050 WU: win=16\001
+4 1 0 52 -1 16 8 0.4363 4 105 690 6795 1935 WU: win=8\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 1305 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 1485 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 3195 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 3465 -2 = 4\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 3825 -2 = 2\001
+4 0 20 54 -1 18 6 0.0000 4 75 270 8055 4095 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 5085 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 5355 -2 = 4\001
+4 0 0 53 -1 16 6 0.0000 4 105 495 8190 3645 WP1 @12\001
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+4 0 0 53 -1 16 6 0.0000 4 105 435 8190 1710 WP0 @4\001
+4 0 0 53 -1 16 6 0.0000 4 75 360 8190 1860    => +8\001
+4 2 0 53 -1 16 6 0.0000 4 90 315 8865 4770 Pause\001
+4 2 0 53 -1 16 6 0.0000 4 90 210 8865 6660 Zero\001
+4 2 0 53 -1 16 6 0.0000 4 90 390 8865 6750 Window\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 5625 -2 = 3\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 6435 -2 = 4\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 6615 -2 = 2\001
+4 0 20 54 -1 18 6 0.0000 4 75 270 11205 6795 -2 = 0\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 5625 -2 = 8\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 5850 -2 = 8\001
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+4 0 0 54 -1 16 6 0.0000 4 75 270 8055 6435 -2 = 4\001
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+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 5850 -2 = 7\001
+4 0 0 54 -1 16 6 0.0000 4 75 270 11205 6210 -2 = 6\001
+4 2 0 53 -1 16 6 0.0000 4 90 270 8910 8190 Fixed\001