[[PageOutline]]

= Continuation Round 5 =

In this round, I ran plastic-105 and plastic-106 for about an hour, with only GT and Wisconsin, to try to track down some issues with performance in Round 3 that seemed related to GT. In particular, we wanted to find out whether there was any difference when GT was sending data vs receiving data.

The raw logs are at http://www.gpolab.bbn.com/plastic-slices/continuation/round-5/. 

= plastic-105 =

[ggw:PlasticSlices/Experiments#SteadyPerfTCP SteadyPerf TCP], using port=5105, time=518400, and this table of client/server pairs:

|| '''client'''                   || '''server'''                   || '''server address''' ||
|| wings-openflow-2.wail.wisc.edu || plnode1.cip.gatech.edu         || server=10.42.105.100 ||
|| wings-openflow-3.wail.wisc.edu || plnode2.cip.gatech.edu         || server=10.42.105.101 ||

== One-time prep commands run on each client and server ==

{{{
sudo yum -y install iperf
}}}

== Commands run on each server ==

{{{
server=<ipaddr>
nice -n 19 iperf -B $server -p 5105 -s -i 1
}}}

== Commands run on each client ==

{{{
server=<ipaddr>
nice -n 19 iperf -c $server -p 5105 -t 518400
}}}

== Results ==

Generated with

{{{
subnet=105
for host in $(awk 'NR%2==1' ~/plastic-slices/logins/logins-plastic-$subnet.txt | sed -r -e 's/.+@//') ; do echo -e "$host:\n\n{{{" ; grep -A 5 -B 1 "Client connecting" pgenigpolabbbncom_plastic$subnet\@$host.log ; echo -e "}}}\n" ; done
}}}

and then edited slightly to remove artifacts (like control characters, my prompt, etc).

wings-openflow-2.wail.wisc.edu:

{{{
------------------------------------------------------------
Client connecting to 10.42.105.100, TCP port 5105
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 10.42.105.95 port 55411 connected with 10.42.105.100 port 5105
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-4904.3 sec  1.19 GBytes  2.09 Mbits/sec
}}}

wings-openflow-3.wail.wisc.edu:

{{{
------------------------------------------------------------
Client connecting to 10.42.105.101, TCP port 5105
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 10.42.105.96 port 52296 connected with 10.42.105.101 port 5105
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-4903.6 sec  1.18 GBytes  2.06 Mbits/sec
}}}

== Analysis ==

Not great numbers, but a factor of seven or eight times better than the other direction. This smells like a duplex problem to me -- remember that traffic is sent from the client to the server, in iperf.

= plastic-106 =

[ggw:PlasticSlices/Experiments#SteadyPerfUDP SteadyPerf UDP], using port=5106, time=518400, rate=30, and this table of client/server pairs:

|| '''client'''                   || '''server'''                   || '''server address''' ||
|| wings-openflow-2.wail.wisc.edu || plnode2.cip.gatech.edu         || server=10.42.105.101 ||
|| wings-openflow-3.wail.wisc.edu || plnode1.cip.gatech.edu         || server=10.42.105.100 ||

== One-time prep commands run on each client and server ==

{{{
sudo yum -y install iperf
}}}

== Commands run on each server ==

{{{
server=<ipaddr>
nice -n 19 iperf -u -B $server -p 5106 -s -i 1
}}}

== Commands run on each client ==

{{{
server=<ipaddr>
nice -n 19 iperf -u -c $server -p 5106 -t 518400 -b 30M
}}}

== Results ==

Generated with

{{{
subnet=106
for host in $(awk 'NR%2==1' ~/plastic-slices/logins/logins-plastic-$subnet.txt | sed -r -e 's/.+@//') ; do echo -e "$host:\n\n{{{" ; grep -A 10 -B 1 "Client connecting" pgenigpolabbbncom_plastic$subnet\@$host.log ; echo -e "}}}\n" ; done
}}}

and then edited slightly to remove artifacts (like control characters, my prompt, etc).

wings-openflow-2.wail.wisc.edu:

{{{
------------------------------------------------------------
Client connecting to 10.42.105.101, UDP port 5106
Sending 1470 byte datagrams
UDP buffer size:  110 KByte (default)
------------------------------------------------------------
[  3] local 10.42.105.95 port 50439 connected with 10.42.105.101 port 5106
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-4900.4 sec  17.1 GBytes  30.0 Mbits/sec
[  3] Sent 12501122 datagrams
[  3] Server Report:
[  3]  0.0-4899.9 sec  17.1 GBytes  30.0 Mbits/sec   0.613 ms 6997/12501121 (0.056%)
[  3]  0.0-4899.9 sec  161 datagrams received out-of-order
}}}

wings-openflow-3.wail.wisc.edu:

{{{
------------------------------------------------------------
Client connecting to 10.42.105.100, UDP port 5106
Sending 1470 byte datagrams
UDP buffer size:  110 KByte (default)
------------------------------------------------------------
[  3] local 10.42.105.96 port 48014 connected with 10.42.105.100 port 5106
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-4903.0 sec  17.1 GBytes  30.0 Mbits/sec
[  3] Sent 12507660 datagrams
[  3] Server Report:
[  3]  0.0-4902.8 sec  17.1 GBytes  30.0 Mbits/sec   0.852 ms 9669/12507659 (0.077%)
[  3]  0.0-4902.8 sec  344 datagrams received out-of-order
}}}

== Analysis ==

Not perfect, but three nines isn't bad. A significant difference over the other direction, anyway.