wiki:PlasticSlices/Continuation/Round5

Version 1 (modified by Josh Smift, 8 years ago) (diff)

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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

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

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.