73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test PRR-slowstart implementation.
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// In this variant we test a simple case where in-flight == ssthresh
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// all the way through recovery, so during fast recovery we send one segment
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// for each segment SACKed/ACKed.
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// Set up config.
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`./defaults.sh`
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// Establish a connection.
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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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// RTT 100ms
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+.1 < . 1:1(0) ack 1 win 320
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+0 accept(3, ..., ...) = 4
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// Send 10 data segments.
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+0 write(4, ..., 10000) = 10000
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+0 > P. 1:10001(10000) ack 1
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// Lost packet 1:1001.
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+.11 < . 1:1(0) ack 1 win 320 <sack 1001:2001,nop,nop>
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+.01 < . 1:1(0) ack 1 win 320 <sack 1001:3001,nop,nop>
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+.01 < . 1:1(0) ack 1 win 320 <sack 1001:4001,nop,nop>
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// Enter fast recovery.
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+0 > . 1:1001(1000) ack 1
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+.01 %{
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assert tcpi_ca_state == TCP_CA_Recovery, tcpi_ca_state
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assert tcpi_snd_cwnd == 7, tcpi_snd_cwnd
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assert tcpi_snd_ssthresh == 7, tcpi_snd_ssthresh
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}%
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// Write some more, which we will send 1 MSS at a time,
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// as in-flight segments are SACKed or ACKed.
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+.01 write(4, ..., 7000) = 7000
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+.01 < . 1:1(0) ack 1 win 320 <sack 1001:5001,nop,nop>
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+0 > . 10001:11001(1000) ack 1
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+.01 < . 1:1(0) ack 1 win 320 <sack 1001:6001,nop,nop>
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+0 > . 11001:12001(1000) ack 1
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+.01 < . 1:1(0) ack 1 win 320 <sack 1001:7001,nop,nop>
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+0 > . 12001:13001(1000) ack 1
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+.01 < . 1:1(0) ack 1 win 320 <sack 1001:8001,nop,nop>
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+0 > . 13001:14001(1000) ack 1
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+.01 < . 1:1(0) ack 1 win 320 <sack 1001:9001,nop,nop>
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+0 > . 14001:15001(1000) ack 1
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+.01 < . 1:1(0) ack 1 win 320 <sack 1001:10001,nop,nop>
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+0 > . 15001:16001(1000) ack 1
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+.02 < . 1:1(0) ack 10001 win 320
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+0 > P. 16001:17001(1000) ack 1
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// Leave fast recovery.
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+.01 %{
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assert tcpi_ca_state == TCP_CA_Open, tcpi_ca_state
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assert tcpi_snd_cwnd == 7, tcpi_snd_cwnd
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assert tcpi_snd_ssthresh == 7, tcpi_snd_ssthresh
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}%
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+.03 < . 1:1(0) ack 12001 win 320
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+.02 < . 1:1(0) ack 14001 win 320
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+.02 < . 1:1(0) ack 16001 win 320
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+.02 < . 1:1(0) ack 17001 win 320
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