diff options
Diffstat (limited to 'test/packetdrill/tests/linux/receiver_rtt/rcv-rtt-with-timestamps-new.pkt')
| -rw-r--r-- | test/packetdrill/tests/linux/receiver_rtt/rcv-rtt-with-timestamps-new.pkt | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/test/packetdrill/tests/linux/receiver_rtt/rcv-rtt-with-timestamps-new.pkt b/test/packetdrill/tests/linux/receiver_rtt/rcv-rtt-with-timestamps-new.pkt new file mode 100644 index 0000000..2155f21 --- /dev/null +++ b/test/packetdrill/tests/linux/receiver_rtt/rcv-rtt-with-timestamps-new.pkt @@ -0,0 +1,57 @@ +// Test that receiver-side RTT estimation is sane when +// using TCP timestamps. We assert that the receive-side +// RTT estimate is between 95 and 105ms. + +// Use a small receive buffer so that we advertise small windows, to keep the +// test short. +`sysctl -q net.ipv4.tcp_rmem="4096 10000 2097152"` + +// Create a socket. +0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.000 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 + +// Verify that the receive buffer is the tcp_rmem default. +0.000 getsockopt(3, SOL_SOCKET, SO_RCVBUF, [10000], [4]) = 0 + +0.000 bind(3, ..., ...) = 0 +0.000 listen(3, 1) = 0 + +// Establish a connection. +0.100 < S 0:0(0) win 20000 <mss 1000,sackOK,TS val 100 ecr 0> +0.100 > S. 0:0(0) ack 1 <mss 1460,sackOK,TS val 100 ecr 100> +0.200 < . 1:1(0) ack 1 win 20000 <nop,nop,TS val 200 ecr 100> +0.200 accept(3, ..., ...) = 4 +0.200 %{ assert tcpi_rcv_rtt == 0 }% + +// First flight. +0.200 < . 1:1001(1000) ack 1 win 20000 <nop,nop,TS val 200 ecr 100> +0.200 > . 1:1(0) ack 1001 <nop,nop,TS val 200 ecr 200> +0.200 < . 1001:2001(1000) ack 1 win 20000 <nop,nop,TS val 200 ecr 100> +0.200 > . 1:1(0) ack 2001 <nop,nop,TS val 200 ecr 200> +0.200 read(4, ..., 2000) = 2000 +0.200 %{ assert tcpi_rcv_rtt >= 95*1000 and tcpi_rcv_rtt <= 105*1000 }% + +// Second flight. +0.300 < . 2001:3001(1000) ack 1 win 20000 <nop,nop,TS val 300 ecr 200> +0.300 > . 1:1(0) ack 3001 <nop,nop,TS val 300 ecr 300> +0.300 < . 3001:4001(1000) ack 1 win 20000 <nop,nop,TS val 300 ecr 200> +0.300 > . 1:1(0) ack 4001 <nop,nop,TS val 300 ecr 300> +0.300 < . 4001:5001(1000) ack 1 win 20000 <nop,nop,TS val 300 ecr 200> +0.300 > . 1:1(0) ack 5001 <nop,nop,TS val 300 ecr 300> +0.300 < . 5001:6001(1000) ack 1 win 20000 <nop,nop,TS val 300 ecr 200> +0.300 read(4, ..., 4000) = 4000 +0.300 > . 1:1(0) ack 6001 <nop,nop,TS val 300 ecr 300> +0.300 %{ assert tcpi_rcv_rtt >= 95*1000 and tcpi_rcv_rtt <= 105*1000 }% + +// Third flight. +// We omit outgoing ACKs because we don't care about this behavior, +// and don't want to introduce dependencies on the receive window behavior. +0.400 < . 6001:7001(1000) ack 1 win 20000 <nop,nop,TS val 400 ecr 300> +0.400 < . 7001:8001(1000) ack 1 win 20000 <nop,nop,TS val 400 ecr 300> +0.400 < . 8001:9001(1000) ack 1 win 20000 <nop,nop,TS val 400 ecr 300> +0.400 < . 9001:10001(1000) ack 1 win 20000 <nop,nop,TS val 400 ecr 300> +0.400 < . 10001:11001(1000) ack 1 win 20000 <nop,nop,TS val 400 ecr 300> +0.400 read(4, ..., 5000) = 5000 +0.400 %{ assert tcpi_rcv_rtt >= 95*1000 and tcpi_rcv_rtt <= 105*1000 }% + +0.500 `sysctl -q net.ipv4.tcp_rmem="4096 87380 3732736"` |