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