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Example Result of BWCTL/SS Script

The command './testtcptest.sh mp1.gen.ch.geant2.net 20 0.2' was run on mp1.fra.de.geant2.net, a G�ANT2 Measurement Point device, on 25 Jun 2006, 21:15:58 local time (060625211558). It generated two result files; tcp_test-060625211558-pm1.fra.de.geant2.net.results and stat_changes-060625211558-pm1.fra.de.geant2.net.results

TCP Result

This file is made up of three parts: the Bwctl results, a ping test and the 'ss' results (which show cwnd and ssthresh values every 0.2s (in this case). Note that ssthresh is actually '100' until the first congestion event. After that, it changes (to 1449) and then every subsequent change indicates anothe rcongestion event (in this case almost certainly packet loss). Because of the short RTT (8ms, as per the ping result) the test still managed to run at over 900Mbps.

060625211558
RECEIVER START
3360251762.168253: iperf -B 62.40.122.2 -P 1 -s -f b -m -p 5001 -t 20 -i 2
------------------------------------------------------------
Server listening on TCP port 5001
Binding to local address 62.40.122.2
TCP window size: 12000000 Byte (default)
------------------------------------------------------------
[ 14] local 62.40.122.2 port 5001 connected with 62.40.122.10 port 5001
[ 14]  0.0- 2.0 sec  198457088 Bytes  793828352 bits/sec
[ 14]  2.0- 4.0 sec  198209480 Bytes  792837920 bits/sec
[ 14]  4.0- 6.0 sec  190384488 Bytes  761537952 bits/sec
[ 14]  6.0- 8.0 sec  205028112 Bytes  820112448 bits/sec
[ 14]  8.0-10.0 sec  233463936 Bytes  933855744 bits/sec
[ 14] 10.0-12.0 sec  233691272 Bytes  934765088 bits/sec
[ 14] 12.0-14.0 sec  234703424 Bytes  938813696 bits/sec
[ 14] 14.0-16.0 sec  233673400 Bytes  934693600 bits/sec
[ 14] 16.0-18.0 sec  234047976 Bytes  936191904 bits/sec
[ 14] 18.0-20.0 sec  234337080 Bytes  937348320 bits/sec
[ 14]  0.0-20.1 sec  2203090944 Bytes  878583539 bits/sec
[ 14] MSS size 1448 bytes (MTU 1500 bytes, ethernet)
RECEIVER END
PING fe0-vlan71.srv3.gen.ch.geant2.net (62.40.122.2) 56(84) bytes of data.
64 bytes from fe0-vlan71.srv3.gen.ch.geant2.net (62.40.122.2): icmp_seq=0 ttl=62 time=8.35 ms
64 bytes from fe0-vlan71.srv3.gen.ch.geant2.net (62.40.122.2): icmp_seq=1 ttl=62 time=8.34 ms
64 bytes from fe0-vlan71.srv3.gen.ch.geant2.net (62.40.122.2): icmp_seq=2 ttl=62 time=8.40 ms

--- fe0-vlan71.srv3.gen.ch.geant2.net ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2010ms
rtt min/avg/max/mdev = 8.343/8.366/8.402/0.078 ms, pipe 2
4.8	 ESTAB	 0	 6007752	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.208	 cwnd:683	 ssthresh:100		  
5.0	 ESTAB	 0	 6825872	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.216	 cwnd:1525	 ssthresh:100		  
5.2	 ESTAB	 0	 6552024	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:1641	 ssthresh:1449		  
5.4	 ESTAB	 0	 8580920	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:1423	 ssthresh:1423		  
5.6	 ESTAB	 0	 8732888	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.244	 cwnd:1555	 ssthresh:1423		  
5.8	 ESTAB	 0	 7486408	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.232	 cwnd:1594	 ssthresh:1423		  
6.0	 ESTAB	 0	 6067120	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.252	 cwnd:1349	 ssthresh:1275		  
6.2	 ESTAB	 0	 7635304	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:1428	 ssthresh:1275		  
6.4	 ESTAB	 0	 6896824	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:1431	 ssthresh:1275		  
6.6	 ESTAB	 0	 6447944	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:1433	 ssthresh:1275		  
6.8	 ESTAB	 0	 6173536	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:1436	 ssthresh:1275		  
7.0	 ESTAB	 0	 6862128	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.232	 cwnd:1150	 ssthresh:1150		  
7.2	 ESTAB	 0	 7615032	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:1402	 ssthresh:1150		  
7.4	 ESTAB	 0	 7219552	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:1144	 ssthresh:1144		  
7.6	 ESTAB	 0	 8790808	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:1264	 ssthresh:1144		  
7.8	 ESTAB	 0	 7339912	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:1281	 ssthresh:1144		  
8.0	 ESTAB	 0	 6686864	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:1128	 ssthresh:1025		  
8.2	 ESTAB	 0	 7633856	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:737	 ssthresh:918		  
8.4	 ESTAB	 0	 7342808	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:1029	 ssthresh:1025		  
8.6	 ESTAB	 0	 7981488	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.228	 cwnd:775	 ssthresh:824		  
8.8	 ESTAB	 0	 5996168	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:920	 ssthresh:824		  
9.0	 ESTAB	 0	 5950192	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:923	 ssthresh:824		  
9.2	 ESTAB	 0	 7761280	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:779	 ssthresh:740		  
9.4	 ESTAB	 0	 6610120	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:828	 ssthresh:740		  
9.6	 ESTAB	 0	 6126904	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:833	 ssthresh:740		  
9.8	 ESTAB	 0	 7807616	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:746	 ssthresh:668		  
10.0	 ESTAB	 0	 6960536	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:831	 ssthresh:668		  
10.2	 ESTAB	 0	 5944040	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:835	 ssthresh:668		  
10.4	 ESTAB	 0	 6720608	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:840	 ssthresh:668		  
10.6	 ESTAB	 0	 7612136	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:622	 ssthresh:671		  
10.8	 ESTAB	 0	 7752320	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:834	 ssthresh:671		  
11.0	 ESTAB	 0	 8501208	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:620	 ssthresh:669		  
11.2	 ESTAB	 0	 8860312	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:747	 ssthresh:669		  
11.4	 ESTAB	 0	 7357288	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:752	 ssthresh:669		  
11.6	 ESTAB	 0	 6509344	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:756	 ssthresh:669		  
11.8	 ESTAB	 0	 8525824	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
12.0	 ESTAB	 0	 7510776	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:757	 ssthresh:669		  
12.2	 ESTAB	 0	 6314728	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
12.4	 ESTAB	 0	 8175408	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
12.6	 ESTAB	 0	 7649784	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
12.8	 ESTAB	 0	 6140968	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
13.0	 ESTAB	 0	 7771416	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
13.2	 ESTAB	 0	 6763608	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
13.4	 ESTAB	 0	 6441240	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
13.6	 ESTAB	 0	 7230312	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
13.8	 ESTAB	 0	 8423368	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
14.0	 ESTAB	 0	 7444168	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
14.2	 ESTAB	 0	 6375288	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:757	 ssthresh:669		  
14.4	 ESTAB	 0	 8371032	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
14.6	 ESTAB	 0	 7626616	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
14.8	 ESTAB	 0	 6277080	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:757	 ssthresh:669		  
15.0	 ESTAB	 0	 7554536	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
15.2	 ESTAB	 0	 8282632	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
15.4	 ESTAB	 0	 7444168	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
15.6	 ESTAB	 0	 6047336	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
15.8	 ESTAB	 0	 7663912	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
16.0	 ESTAB	 0	 8612704	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
16.2	 ESTAB	 0	 7473128	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
16.4	 ESTAB	 0	 6057336	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
16.6	 ESTAB	 0	 7249672	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
16.8	 ESTAB	 0	 7596208	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.224	 cwnd:757	 ssthresh:669		  
17.0	 ESTAB	 0	 8217160	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
17.2	 ESTAB	 0	 8838184	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
17.4	 ESTAB	 0	 6760712	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
17.6	 ESTAB	 0	 6716776	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
17.8	 ESTAB	 0	 8697128	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
18.0	 ESTAB	 0	 8446184	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
18.2	 ESTAB	 0	 7195112	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
18.4	 ESTAB	 0	 6849040	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
18.6	 ESTAB	 0	 7929224	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
18.8	 ESTAB	 0	 8053776	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
19.0	 ESTAB	 0	 8243464	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
19.2	 ESTAB	 0	 8615544	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
19.4	 ESTAB	 0	 7432584	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
19.6	 ESTAB	 0	 6233640	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
19.8	 ESTAB	 0	 6757864	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
20.0	 ESTAB	 0	 6917080	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
20.2	 ESTAB	 0	 6906568	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
20.4	 ESTAB	 0	 7193624	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
20.6	 ESTAB	 0	 7782376	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
20.8	 ESTAB	 0	 8056672	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
21.0	 ESTAB	 0	 8446184	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
21.2	 ESTAB	 0	 8382472	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
21.4	 ESTAB	 0	 6740440	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
21.6	 ESTAB	 0	 5967880	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
21.8	 ESTAB	 0	 8108448	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  
22.0	 FIN-WAIT-1	 0	 6779025	 62.40.122.10:5001	 62.40.122.2:5001	 rto:0.22	 cwnd:757	 ssthresh:669		  

Netstat Difference

This file shows the difference in 'netasts -s' (netstat statisistics) run immediately before and after the test. Note the number of TCP losses and retransmissions. On a larget BDP path this would casue serious problems.

2c2
<	  4028590310 total packets received
---
>	  4029359442 total packets received
5,6c5,6
<	  4028566093 incoming packets delivered
<	  424521728 requests sent out
---
>	  4029335225 incoming packets delivered
>	  426044288 requests sent out
20c20
<	  1816196 ICMP messages sent
---
>	  1816221 ICMP messages sent
23c23
<			destination unreachable: 1814985
---
>			destination unreachable: 1815010
26,27c26,27
<	  22738 active connections openings
<	  17611 passive connection openings
---
>	  22742 active connections openings
>	  17612 passive connection openings
31,33c31,33
<	  3953422230 segments received
<	  321952583 segments send out
<	  4030754 segments retransmited
---
>	  3954191012 segments received
>	  323474647 segments send out
>	  4031256 segments retransmited
37,38c37,38
<	  63481111 packets received
<	  1814750 packets to unknown port received.
---
>	  63481436 packets received
>	  1814775 packets to unknown port received.
40c40
<	  101280859 packets sent
---
>	  101281338 packets sent
47c47
<	  83670 delayed acks sent
---
>	  83676 delayed acks sent
53c53
<	  2148653238 packets header predicted
---
>	  2148653260 packets header predicted
55,56c55,56
<	  TCPPureAcks: 57876113
<	  TCPHPAcks: 1509636499
---
>	  TCPPureAcks: 57894124
>	  TCPHPAcks: 1510387226
58c58
<	  TCPSackRecovery: 32225
---
>	  TCPSackRecovery: 32236
63,65c63,65
<	  TCPTSReorder: 24200
<	  TCPFullUndo: 3930
<	  TCPPartialUndo: 2320852
---
>	  TCPTSReorder: 24201
>	  TCPFullUndo: 3931
>	  TCPPartialUndo: 2321482
68c68
<	  TCPLoss: 4960090
---
>	  TCPLoss: 4963523
73c73
<	  TCPFastRetrans: 2700486
---
>	  TCPFastRetrans: 2700988
83c83
<	  TCPDSACKRecv: 2818234
---
>	  TCPDSACKRecv: 2818236

-- Main.TobyRodwell - 25 Jun 2006

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