diff options
Diffstat (limited to 'test/packetdrill/tests/linux/early_retransmit/er-delayed-get-ack-3pkt-sack.pkt')
| -rw-r--r-- | test/packetdrill/tests/linux/early_retransmit/er-delayed-get-ack-3pkt-sack.pkt | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/test/packetdrill/tests/linux/early_retransmit/er-delayed-get-ack-3pkt-sack.pkt b/test/packetdrill/tests/linux/early_retransmit/er-delayed-get-ack-3pkt-sack.pkt new file mode 100644 index 0000000..794bcb0 --- /dev/null +++ b/test/packetdrill/tests/linux/early_retransmit/er-delayed-get-ack-3pkt-sack.pkt @@ -0,0 +1,35 @@ +// Test delayed ER with 3 packets outstanding, receiver sending SACKs. +// Added wrinkles: (1) sender gets an ACK before delayed ER timer fires, +// so we don't do the originally scheduled ER but instead reschedule +// the ER timer for later. + +// Enable delayed early retransmit. +`sysctl -q net.ipv4.tcp_early_retrans=2` + +0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.000 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.000 bind(3, ..., ...) = 0 +0.000 listen(3, 1) = 0 + +0.100 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7> +0.100 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 6> +0.200 < . 1:1(0) ack 1 win 257 +0.200 accept(3, ..., ...) = 4 + +0.200 write(4, ..., 4380) = 4380 +0.200 > P. 1:4381(4380) ack 1 +0.300 < . 1:1(0) ack 1 win 257 <sack 1461:2921,nop,nop> +0.300 < . 1:1(0) ack 1 win 257 <sack 1461:4381,nop,nop> +// Next we get an ACK before ER fires. Any ACK should cause us +// to cancel ER timer, whether it ACKs new data or (as in this case) does not. +// Then we reschedule the ER timer again. +0.310 < . 1:1(0) ack 1 win 257 <sack 1461:4381,nop,nop> +0.335 > . 1:1461(1460) ack 1 // delayed ER at 0.310 + RTT/4=25ms +0.435 < . 1:1(0) ack 4381 win 257 + +0.700 close(4) = 0 +0.700 > F. 4381:4381(0) ack 1 +0.800 < F. 1:1(0) ack 4382 win 257 +0.800 > . 4382:4382(0) ack 2 + +0.900 `sysctl -q net.ipv4.tcp_early_retrans=3` |