Attachment 201465 Details for Bug 235256 – packetdrill script to validate IW10 behavior without ABC

packetdrill script to validate IW10 behavior without ABC

newreno-slowstart-after-rto.pkt (text/plain), 2.10 KB, created by Richard Scheffenegger on 2019-01-27 22:54:12 UTC

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Creator: Richard Scheffenegger

Created: 2019-01-27 22:54:12 UTC

Size: 2.10 KB

patch

obsolete

>// A simple server-side test that sends exactly an initial window (IW10)
>// worth of packets.
>
>--tolerance_usecs=700000
>
>// Flush Hostcache
>0.0 `sysctl net.inet.tcp.cc.algorithm=newreno`
>0.1 `sysctl net.inet.tcp.initcwnd_segments=10`
>0.15 `sysctl net.inet.tcp.rfc3465=0`
>0.2 `sysctl net.inet.tcp.hostcache.purgenow=1`
>0.3 `sync` // in case of crash
>
>// Create a listening TCP socket.
> 0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
>+0.005 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
>+0.005 setsockopt(3, SOL_SOCKET, SO_DEBUG, [1], 4) = 0
>+0.005 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [1048576], 4) = 0
>+0.005 bind(3, ..., ...) = 0
>+0.005 listen(3, 1) = 0
>
>// Establish a TCP connection with ECN to explicitly track CWR
>
>+0.035 < SEW  0:0(0) win 65535 <mss 1000, sackOK, wscale 10, eol, nop, nop>
>+0.000 > SE. 0:0(0) ack 1 win 65535 <...>
>+0.000 <  . 1:1(0) ack 1 win 65535
>+0.000 accept(3, ..., ...) = 4
>+0 %{ print "initial window:\t\t cwnd: {}  ssthresh: {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh)
>if (tcpi_snd_cwnd != 10001):
>  print "Error - Initial Window after 3WHS is not equal 10 MSS"
>assert tcpi_snd_cwnd == 10001
>}%
>
>// First, send IW plus 1 segment, drop 2nd packet to pull ssthresh low
>0.700 write(4, ..., 15000) = 15000
>
>+0 > .       1:1001(1000) ack 1
>+0 %{ print "initial window:\t\t cwnd: {}  ssthresh: {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) 
>if (tcpi_snd_cwnd != 10000):
>  print "Error - Initial Window not equal to 10 MSS!"
>assert tcpi_snd_cwnd != 10000
>}%
>+0 > .    1001:2001(1000) ack 1
>+0 > .    2001:3001(1000) ack 1
>+0 > .    3001:4001(1000) ack 1
>+0 > .    4001:5001(1000) ack 1
>+0 > .    5001:6001(1000) ack 1
>+0 > .    6001:7001(1000) ack 1
>+0 > .    7001:8001(1000) ack 1
>+0 > .    8001:9001(1000) ack 1
>+0 > .   9001:10001(1000) ack 1
>+0 > .  10001:11001(1000) ack 1 // the eleventh segment (!)
>
>//RTO
>+3 > .       1:1001(1000) ack 1
>+0 %{ print "initial window:\t\t cwnd: {}  ssthresh: {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) 
>if (tcpi_snd_cwnd > 1000):
>  print "Error - Window after RTO larger than 1 MSS!"
>assert tcpi_snd_cwnd == 1000
>}%
>
>
>+0.2 close(4) = 0
>+0.01 < F. 1:1(0) ack 60002 win 65535
>

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