34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test of slow start when an outstanding flight of packets is
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// less than the current cwnd, and not big enough to bump up cwnd.
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//
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// In this variant, the receiver ACKs every other packet,
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// approximating standard delayed ACKs.
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// Set up config.
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`./defaults.sh`
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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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+0 < 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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+0 < . 1:1(0) ack 1 win 257
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+0 accept(3, ..., ...) = 4
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// Only send 5 packets.
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+0 write(4, ..., 5000) = 5000
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+0 > P. 1:5001(5000) ack 1
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+0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%
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+0 < . 1:1(0) ack 2001 win 257
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+0 %{ assert tcpi_snd_cwnd == 10, 'cwnd=%d' % tcpi_snd_cwnd }%
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+0 < . 1:1(0) ack 4001 win 257
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+0 %{ assert tcpi_snd_cwnd == 10, 'cwnd=%d' % tcpi_snd_cwnd }%
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+0 < . 1:1(0) ack 5001 win 257
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+0 %{ assert tcpi_snd_cwnd == 10, 'cwnd=%d' % tcpi_snd_cwnd }%
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