36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test of slow start when not application-limited, so that
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// the cwnd continues to grow.
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// In this variant, the receiver sends one ACK per 4 packets.
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// Set up config. To keep things simple, disable the
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// mechanism that defers sending in order to send bigger TSO packets.
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`./defaults.sh
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sysctl -q net.ipv4.tcp_tso_win_divisor=100`
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
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+0 bind(3, ..., ...) = 0
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+0 listen(3, 1) = 0
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+.1 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
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+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
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+.1 < . 1:1(0) ack 1 win 257
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+0 accept(3, ..., ...) = 4
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+0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [200000], 4) = 0
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+0 write(4, ..., 30000) = 30000
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+0 > P. 1:10001(10000) ack 1
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+0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%
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+.11 < . 1:1(0) ack 4001 win 257
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+0 > P. 10001:18001(8000) ack 1
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+.01 < . 1:1(0) ack 8001 win 257
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+0 > P. 18001:26001(8000) ack 1
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+.005 < . 1:1(0) ack 10001 win 257
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+0 > P. 26001:30001(4000) ack 1
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+0 %{ assert tcpi_snd_cwnd == 20, tcpi_snd_cwnd }%
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