diff options
Diffstat (limited to 'tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-2pkt-send-6pkt.pkt')
| -rw-r--r-- | tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-2pkt-send-6pkt.pkt | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-2pkt-send-6pkt.pkt b/tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-2pkt-send-6pkt.pkt new file mode 100644 index 000000000000..416c901ddf51 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-2pkt-send-6pkt.pkt @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test of slow start when an outstanding flight of packets is +// less than the current cwnd, but still big enough that in slow +// start we want to increase our cwnd a little. +// +// In this variant, the receiver ACKs every other packet, +// approximating standard delayed ACKs. + +// Set up config. +`./defaults.sh` + + 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 + + +0 < 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> + +0 < . 1:1(0) ack 1 win 257 + +0 accept(3, ..., ...) = 4 + +// Only send 6 packets. + +0 write(4, ..., 6000) = 6000 + +0 > P. 1:6001(6000) ack 1 + +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }% + + +0 < . 1:1(0) ack 2001 win 257 + +0 %{ assert tcpi_snd_cwnd == 12, 'cwnd=%d' % tcpi_snd_cwnd }% + + +0 < . 1:1(0) ack 4001 win 257 + +0 %{ assert tcpi_snd_cwnd == 12, 'cwnd=%d' % tcpi_snd_cwnd }% + + +0 < . 1:1(0) ack 6001 win 257 + +0 %{ assert tcpi_snd_cwnd == 12, 'cwnd=%d' % tcpi_snd_cwnd }% |