1 // SPDX-License-Identifier: GPL-2.0
2 // Test of slow start when not application-limited, so that
3 // the cwnd continues to grow.
4 // In this variant, the receiver ACKs every packet.
5
6 // Set up config. To keep things simple, disable the
7 // mechanism that defers sending in order to send bigger TSO packets.
8 `./defaults.sh
9 sysctl -q net.ipv4.tcp_tso_win_divisor=100`
10
11 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
12 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
13 +0 bind(3, ..., ...) = 0
14 +0 listen(3, 1) = 0
15
16 +.1 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
17 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
18 +.1 < . 1:1(0) ack 1 win 257
19 +0 accept(3, ..., ...) = 4
20 +0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [200000], 4) = 0
21
22 +0 write(4, ..., 30000) = 30000
23 +0 > P. 1:10001(10000) ack 1
24 +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%
25
26 +.105 < . 1:1(0) ack 1001 win 257
27 +0 > P. 10001:12001(2000) ack 1
28
29 +0 < . 1:1(0) ack 2001 win 257
30 +0 > P. 12001:14001(2000) ack 1
31
32 +.005 < . 1:1(0) ack 3001 win 257
33 +0 > P. 14001:16001(2000) ack 1
34
35 +0 < . 1:1(0) ack 4001 win 257
36 +0 > P. 16001:18001(2000) ack 1
37
38 +.005 < . 1:1(0) ack 5001 win 257
39 +0 > P. 18001:20001(2000) ack 1
40
41 +0 < . 1:1(0) ack 6001 win 257
42 +0 > P. 20001:22001(2000) ack 1
43
44 +.005 < . 1:1(0) ack 7001 win 257
45 +0 > P. 22001:24001(2000) ack 1
46
47 +0 < . 1:1(0) ack 8001 win 257
48 +0 > P. 24001:26001(2000) ack 1
49
50 +.005 < . 1:1(0) ack 9001 win 257
51 +0 > P. 26001:28001(2000) ack 1
52
53 +0 < . 1:1(0) ack 10001 win 257
54 +0 > P. 28001:30001(2000) ack 1
55
56 +0 %{ assert tcpi_snd_cwnd == 20, tcpi_snd_cwnd }%
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