1 // SPDX-License-Identifier: GPL-2.0
2 // Test of slow start when application-limited: in this case,
3 // with IW10, if we don't fully use our cwnd but instead
4 // send just 9 packets, then cwnd should grow to twice that
5 // value, or 18 packets.
6
7 // Set up config.
8 `./defaults.sh`
9
10 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
11 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
12 +0 bind(3, ..., ...) = 0
13 +0 listen(3, 1) = 0
14
15 +.1 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
16 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
17 +.1 < . 1:1(0) ack 1 win 257
18 +0 accept(3, ..., ...) = 4
19 +0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [200000], 4) = 0
20
21 +0 write(4, ..., 9000) = 9000
22 +0 > P. 1:9001(9000) ack 1
23 +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%
24
25 +.105 < . 1:1(0) ack 2001 win 257
26 +0 %{ assert tcpi_snd_cwnd == 12, tcpi_snd_cwnd }%
27
28 +.005 < . 1:1(0) ack 4001 win 257
29 +0 %{ assert tcpi_snd_cwnd == 14, tcpi_snd_cwnd }%
30
31 +.005 < . 1:1(0) ack 6001 win 257
32 +0 %{ assert tcpi_snd_cwnd == 16, tcpi_snd_cwnd }%
33
34 +.005 < . 1:1(0) ack 8001 win 257
35 +0 %{ assert tcpi_snd_cwnd == 18, tcpi_snd_cwnd }%
36
37 +.005 < . 1:1(0) ack 9001 win 257
38 +0 %{ assert tcpi_snd_cwnd == 18, tcpi_snd_cwnd }%
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