1// SPDX-License-Identifier: GPL-2.0 2// Test of slow start when application-limited: in this case, 3// with IW10, if we send exactly 10 packets then cwnd should grow to 20. 4 5// Set up config. 6`./defaults.sh` 7 8 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 9 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 10 +0 bind(3, ..., ...) = 0 11 +0 listen(3, 1) = 0 12 13 +.1 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7> 14 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> 15 +.1 < . 1:1(0) ack 1 win 257 16 +0 accept(3, ..., ...) = 4 17 +0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [200000], 4) = 0 18 19 +0 write(4, ..., 10000) = 10000 20 +0 > P. 1:10001(10000) ack 1 21 +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }% 22 23+.105 < . 1:1(0) ack 2001 win 257 24 +0 %{ assert tcpi_snd_cwnd == 12, tcpi_snd_cwnd }% 25 26+.005 < . 1:1(0) ack 4001 win 257 27 +0 %{ assert tcpi_snd_cwnd == 14, tcpi_snd_cwnd }% 28 29+.005 < . 1:1(0) ack 6001 win 257 30 +0 %{ assert tcpi_snd_cwnd == 16, tcpi_snd_cwnd }% 31 32+.005 < . 1:1(0) ack 8001 win 257 33 +0 %{ assert tcpi_snd_cwnd == 18, tcpi_snd_cwnd }% 34 35+.005 < . 1:1(0) ack 10001 win 257 36 +0 %{ assert tcpi_snd_cwnd == 20, tcpi_snd_cwnd }% 37