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1// SPDX-License-Identifier: GPL-2.02// Test of slow start when application-limited: in this case,3// with IW10, if we don't fully use our cwnd but instead4// send just 9 packets, then cwnd should grow to twice that5// value, or 18 packets.6 7// Set up config.8`./defaults.sh`9 10 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 311 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 012 +0 bind(3, ..., ...) = 013 +0 listen(3, 1) = 014 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 25718 +0 accept(3, ..., ...) = 419 +0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [200000], 4) = 020 21 +0 write(4, ..., 9000) = 900022 +0 > P. 1:9001(9000) ack 123 +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%24 25+.105 < . 1:1(0) ack 2001 win 25726 +0 %{ assert tcpi_snd_cwnd == 12, tcpi_snd_cwnd }%27 28+.005 < . 1:1(0) ack 4001 win 25729 +0 %{ assert tcpi_snd_cwnd == 14, tcpi_snd_cwnd }%30 31+.005 < . 1:1(0) ack 6001 win 25732 +0 %{ assert tcpi_snd_cwnd == 16, tcpi_snd_cwnd }%33 34+.005 < . 1:1(0) ack 8001 win 25735 +0 %{ assert tcpi_snd_cwnd == 18, tcpi_snd_cwnd }%36 37+.005 < . 1:1(0) ack 9001 win 25738 +0 %{ assert tcpi_snd_cwnd == 18, tcpi_snd_cwnd }%39