1// Test SACK space grab to fit AccECN option 2--tcp_ts_tick_usecs=1000 3 4`./defaults.sh 5sysctl -q net.ipv4.tcp_ecn=3 6` 7 8 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 9 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 10 +0 bind(3, ..., ...) = 0 11 +0 listen(3, 1) = 0 12 13 +0 < SEWA 0:0(0) win 32792 <mss 1050,nop,nop,sackOK,nop,wscale 8> 14+.002 > SW. 0:0(0) ack 1 <mss 1460,ECN e1b 1 ceb 0 e0b 1,nop,nop,nop,sackOK,nop,wscale 8> 15+0.05 < [ect0] W. 1:1(0) ack 1 win 264 <ECN e0b 1 ceb 0 e1b 1,nop> 16+.002 accept(3, ..., ...) = 4 17 18+.01 < [ect1] EAP. 1001:2001(1000) ack 1 win 264 19+0.002 > [ect0] EA. 1:1(0) ack 1 <ECN e1b 1001 ceb 0 e0b 1,nop,nop,nop,sack 1001:2001> 20+.01 < [ect0] EAP. 3001:4001(1000) ack 1 win 264 21+0.002 > [ect0] EA. 1:1(0) ack 1 <ECN e1b 1001 ceb 0 e0b 1001,nop,nop,nop,sack 3001:4001 1001:2001> 22+.01 < [ce] EAP. 5001:6001(1000) ack 1 win 264 23+0.002 > [ect0] WA. 1:1(0) ack 1 <ECN e1b 1001 ceb 1000 e0b 1001,nop,nop,nop,sack 5001:6001 3001:4001 1001:2001> 24// DSACK works? 25+.01 < [ect0] EAP. 5001:6001(1000) ack 1 win 264 26+0.002 > [ect0] WA. 1:1(0) ack 1 <ECN e1b 1001 ceb 1000 e0b 2001,nop,nop,nop,sack 5001:6001 5001:6001 3001:4001> 27+.01 < [ect1] EAP. 6001:7001(1000) ack 1 win 264 28+0.002 > [ect0] WA. 1:1(0) ack 1 <ECN e1b 2001 ceb 1000 e0b 2001,nop,nop,nop,sack 5001:7001 3001:4001 1001:2001> 29