Change Details

packetdrill script (here for dctcp) // Testing DCTCP --tolerance_usecs=20000 // Load and enable DCTCP module and flush hostcache 0.0 `if kldstat | grep -q cc_dctcp; then echo dctcp already loaded; else kldload cc_dctcp; fi` +0.1 `sysctl net.inet.tcp.cc.algorithm=dctcp` +0.1 `sysctl net.inet.tcp.cc.dctcp.alpha=0` +0.1 `sysctl net.inet.tcp.initcwnd_segments=10` +0.1 `sysctl net.inet.tcp.ecn.enable=1` +0.1 `sysctl net.inet.tcp.hostcache.purgenow=1` // Create a listening TCP socket. +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [1048576], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_DEBUG, [1], 4) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 // Establish a TCP connection. +0.04 <[ect0] SEW 0:0(0) win 65535 <mss 1012, sackOK, wscale 10, TS val 100 ecr 0, eol > +0.00 >[noecn] SE. 0:0(0) ack 1 win 65535 <...> +0.00 <[ect0] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 4 // Send IW plus 1 segment, check ECN bits +1.0 <[ect0] . 1:1001(1000) ack 1 win 65535 +0 <[ect0] . 1001:2001(1000) ack 1 win 65535 +0 >[noecn] . 1:1(0) ack 2001 <...> +0 write(4, ..., 1) = 1 +0 >[ect0] P. 1:2(1) ack 2001 <...> +0 <[ect0] . 2001:3001(1000) ack 2 win 65535 +0 write(4, ..., 1) = 1 +0 >[ect0] P. 2:3(1) ack 3001 <...> +0 <[ect0] . 3001:4001(1000) ack 3 win 65535 +0 <[ect0] . 4001:5001(1000) ack 3 win 65535 +0 >[noecn] . 3:3(0) ack 5001 <...> +0.01 <[ce] P. 5001:5501(500) ack 3 win 65535 +0 >[noecn] E. 3:3(0) ack 5501 <...> +0.001 read(4, ..., 5500) = 5500 +0 write(4, ..., 1) = 1 +0 > [ect0] PE. 3:4(1) ack 5501 <...> +0.01 <[ect0] W. 5501:6501(1000) ack 4 win 65535 // no delay ACK on CWR flag +0 >[noecn] . 4:4(0) ack 6501 <...> +0.31 <[ect0] . 6501:7501(1000) ack 4 win 65535 +0.1 >[noecn] . 4:4(0) ack 7501 <...>

packetdrill script (here for dctcp) ``` // Testing DCTCP --tolerance_usecs=20000 // Load and enable DCTCP module and flush hostcache 0.0 `if kldstat | grep -q cc_dctcp; then echo dctcp already loaded; else kldload cc_dctcp; fi` +0.1 `sysctl net.inet.tcp.cc.algorithm=dctcp` +0.1 `sysctl net.inet.tcp.cc.dctcp.alpha=0` +0.1 `sysctl net.inet.tcp.initcwnd_segments=10` +0.1 `sysctl net.inet.tcp.ecn.enable=1` +0.1 `sysctl net.inet.tcp.hostcache.purgenow=1` // Create a listening TCP socket. +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [1048576], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_DEBUG, [1], 4) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 // Establish a TCP connection. +0.04 <[ect0] SEW 0:0(0) win 65535 <mss 1012, sackOK, wscale 10, TS val 100 ecr 0, eol > +0.00 >[noecn] SE. 0:0(0) ack 1 win 65535 <...> +0.00 <[ect0] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 4 // Send IW plus 1 segment, check ECN bits +1.0 <[ect0] . 1:1001(1000) ack 1 win 65535 +0 <[ect0] . 1001:2001(1000) ack 1 win 65535 +0 >[noecn] . 1:1(0) ack 2001 <...> +0 write(4, ..., 1) = 1 +0 >[ect0] P. 1:2(1) ack 2001 <...> +0 <[ect0] . 2001:3001(1000) ack 2 win 65535 +0 write(4, ..., 1) = 1 +0 >[ect0] P. 2:3(1) ack 3001 <...> +0 <[ect0] . 3001:4001(1000) ack 3 win 65535 +0 <[ect0] . 4001:5001(1000) ack 3 win 65535 +0 >[noecn] . 3:3(0) ack 5001 <...> +0.01 <[ce] P. 5001:5501(500) ack 3 win 65535 +0 >[noecn] E. 3:3(0) ack 5501 <...> +0.001 read(4, ..., 5500) = 5500 +0 write(4, ..., 1) = 1 +0 > [ect0] PE. 3:4(1) ack 5501 <...> +0.01 <[ect0] W. 5501:6501(1000) ack 4 win 65535 // no delay ACK on CWR flag +0 >[noecn] . 4:4(0) ack 6501 <...> +0.31 <[ect0] . 6501:7501(1000) ack 4 win 65535 +0.1 >[noecn] . 4:4(0) ack 7501 <...> ```

packetdrill script (here for dctcp) ``` // Testing DCTCP --tolerance_usecs=20000 // Load and enable DCTCP module and flush hostcache 0.0 `if kldstat | grep -q cc_dctcp; then echo dctcp already loaded; else kldload cc_dctcp; fi` +0.1 `sysctl net.inet.tcp.cc.algorithm=dctcp` +0.1 `sysctl net.inet.tcp.cc.dctcp.alpha=0` +0.1 `sysctl net.inet.tcp.initcwnd_segments=10` +0.1 `sysctl net.inet.tcp.ecn.enable=1` +0.1 `sysctl net.inet.tcp.hostcache.purgenow=1` // Create a listening TCP socket. +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [1048576], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_DEBUG, [1], 4) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 // Establish a TCP connection. +0.04 <[ect0] SEW 0:0(0) win 65535 <mss 1012, sackOK, wscale 10, TS val 100 ecr 0, eol > +0.00 >[noecn] SE. 0:0(0) ack 1 win 65535 <...> +0.00 <[ect0] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 4 // Send IW plus 1 segment, check ECN bits +1.0 <[ect0] . 1:1001(1000) ack 1 win 65535 +0 <[ect0] . 1001:2001(1000) ack 1 win 65535 +0 >[noecn] . 1:1(0) ack 2001 <...> +0 write(4, ..., 1) = 1 +0 >[ect0] P. 1:2(1) ack 2001 <...> +0 <[ect0] . 2001:3001(1000) ack 2 win 65535 +0 write(4, ..., 1) = 1 +0 >[ect0] P. 2:3(1) ack 3001 <...> +0 <[ect0] . 3001:4001(1000) ack 3 win 65535 +0 <[ect0] . 4001:5001(1000) ack 3 win 65535 +0 >[noecn] . 3:3(0) ack 5001 <...> +0.01 <[ce] P. 5001:5501(500) ack 3 win 65535 +0 >[noecn] E. 3:3(0) ack 5501 <...> +0.001 read(4, ..., 5500) = 5500 +0 write(4, ..., 1) = 1 +0 > [ect0] PE. 3:4(1) ack 5501 <...> +0.01 <[ect0] W. 5501:6501(1000) ack 4 win 65535 // no delay ACK on CWR flag +0 >[noecn] . 4:4(0) ack 6501 <...> +0.31 <[ect0] . 6501:7501(1000) ack 4 win 65535 +0.1 >[noecn] . 4:4(0) ack 7501 <...> ```