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// Test TSO segment split
// Establish a connection.
0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
0.000 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
0.000 bind(3, ..., ...) = 0
0.000 listen(3, 1) = 0
0.100 < S 0:0(0) win 5360 <mss 536,sackOK,nop,nop,nop,wscale 7>
+0 > S. 0:0(0) ack 1 <mss 1460,wscale 10,nop>
+.1 < . 1:1(0) ack 1 win 5360
0.200 accept(3, ..., ...) = 4
// Send 10 MSS.
0.200 write(4, ..., 5360) = 5360
0.200 > . 1:5361(5360) ack 1
// Ack 1st mss (partial ack), and update rcv windows to 1 mss
0.200 < . 1:1(0) ack 537 win 536
// Get 3 dupacks, and reduce rcv window to only 1 mss
0.300 < . 1:1(0) ack 537 win 536
0.300 < . 1:1(0) ack 537 win 536
0.300 < . 1:1(0) ack 537 win 536
// We've received 3 duplicate ACKs, so we do a fast retransmit;
// Segment split happens here.
0.300 > . 537:1073(536) ack 1
// Ack 2nd mss (partial ack)
0.300 < . 1:1(0) ack 1073 win 536
// 3nd mss
0.300 > . 1073:1609(536) ack 1
// Now let's try ack somehere between (3*mss, 4*mss)
0.303 < . 1:1(0) ack 2049 win 536
// We shall send from 2049, and send another mss.
0.303 > . 2049:2585(536) ack 1
// We send some more new data, but it cannot be sent for limited window.
0.303 write(4, ..., 5360) = 5360
0.305 < . 1:1(0) ack 2585 win 5360
0.306 > . 2585:5361(2776) ack 1
0.306 < . 1:1(0) ack 5361 win 5360
// FIXME: the cwnd has been reduced to 2*mss
0.307 > . 5361:6433(1072) ack 1
0.307 < . 1:1(0) ack 6433 win 5360
// FIXME: below behavisor makes no sense
0.307 > . 6433:7409(976) ack 1
0.307 < . 1:1(0) ack 7409 win 5360
0.307 > . 7409:9457(2048) ack 1
0.307 < . 1:1(0) ack 9457 win 5360
0.308 > . 9457:10721(1264) ack 1
0.308 < . 1:1(0) ack 10721 win 5360
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