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e874be276e
Same import process as previous tests.
Also add CONFIG_NET_SCH_FQ to config, as one test uses that.
Same test process as previous tests. Both with and without debug mode.
Recording the steps once:
make mrproper
vng --build \
--config tools/testing/selftests/net/packetdrill/config \
--config kernel/configs/debug.config
vng -v --run . --user root --cpus 4 -- \
make -C tools/testing/selftests TARGETS=net/packetdrill run_tests
Link: https://github.com/linux-netdev/nipa/wiki/How-to-run-netdev-selftests-CI-style#how-to-build
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20240912005317.1253001-4-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
64 lines
2.2 KiB
Plaintext
64 lines
2.2 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, even if TSQ triggers.
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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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// Note we use FQ/pacing to check if TCP Small Queues is not hurting
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`./defaults.sh
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tc qdisc replace dev tun0 root fq
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sysctl -q net/ipv4/tcp_pacing_ss_ratio=200
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sysctl -e -q net.ipv4.tcp_min_tso_segs=2`
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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 1460,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 500
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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, ..., 40000) = 40000
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// This might change if we cook the initial packet with 10 MSS.
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+0 > P. 1:2921(2920) ack 1
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+0 > P. 2921:5841(2920) ack 1
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+0 > P. 5841:8761(2920) ack 1
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+0 > P. 8761:11681(2920) ack 1
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+0 > P. 11681:14601(2920) ack 1
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+0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%
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+.105 < . 1:1(0) ack 2921 win 500
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+0 %{ assert tcpi_snd_cwnd == 12, tcpi_snd_cwnd }%
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// Note: after this commit : "net_sched: sch_fq: account for schedule/timers drifts"
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// FQ notices that this packet missed the 'time to send next packet' computed
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// when prior packet (11681:14601(2920)) was sent.
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// So FQ will allow following packet to be sent a bit earlier (quantum/2)
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// (FQ commit allows an application/cwnd limited flow to get at most quantum/2 extra credit)
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+0 > P. 14601:17521(2920) ack 1
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+.003 < . 1:1(0) ack 5841 win 500
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+0 %{ assert tcpi_snd_cwnd == 14, tcpi_snd_cwnd }%
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+.001 > P. 17521:20441(2920) ack 1
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+.001 < . 1:1(0) ack 8761 win 500
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+0 %{ assert tcpi_snd_cwnd == 16, tcpi_snd_cwnd }%
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// remaining packets are delivered at a constant rate.
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+.007 > P. 20441:23361(2920) ack 1
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+.002 < . 1:1(0) ack 11681 win 500
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+0 %{ assert tcpi_snd_cwnd == 18, tcpi_snd_cwnd }%
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+.001 < . 1:1(0) ack 14601 win 500
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+.004 > P. 23361:26281(2920) ack 1
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+.007 > P. 26281:29201(2920) ack 1
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+0 %{ assert tcpi_snd_cwnd == 20, 'cwnd=%d' % tcpi_snd_cwnd }%
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