[[PageOutline]] = Continuation Round 4 = In this round, we ran plastic-105 and plastic-106 for about three hours, 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 a specific problem with plnode1. The raw logs are at http://www.gpolab.bbn.com/plastic-slices/continuation/round-4/. = plastic-105 = [ggw:PlasticSlices/Experiments#SteadyPerfTCP SteadyPerf TCP], using port=5105, time=518400, and this table of client/server pairs: || '''client''' || '''server''' || '''server address''' || || plnode1.cip.gatech.edu || wings-openflow-2.wail.wisc.edu || server=10.42.105.95 || || plnode2.cip.gatech.edu || wings-openflow-3.wail.wisc.edu || server=10.42.105.96 || == One-time prep commands run on each client and server == {{{ sudo yum -y install iperf }}} == Commands run on each server == {{{ server= nice -n 19 iperf -B $server -p 5105 -s -i 1 }}} == Commands run on each client == {{{ server= 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). plnode1.cip.gatech.edu: {{{ ------------------------------------------------------------ Client connecting to 10.42.105.95, TCP port 5105 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 3] local 10.42.105.100 port 59778 connected with 10.42.105.95 port 5105 [ 3] 0.0-13761.8 sec 405 MBytes 247 Kbits/sec }}} plnode2.cip.gatech.edu: {{{ ------------------------------------------------------------ Client connecting to 10.42.105.96, TCP port 5105 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 3] local 10.42.105.101 port 58242 connected with 10.42.105.96 port 5105 [ 3] 0.0-13768.4 sec 482 MBytes 294 Kbits/sec }}} == Analysis == Less than 300 Kbits/sec is very low. Looking at the server logs shows times when the rate jumped up to one or two Mbits/sec, before dropping back down to double-digt Kbits/sec. The results are similar for the two plnodes, so there probably isn't a problem with just one or the other. = 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''' || || plnode1.cip.gatech.edu || wings-openflow-3.wail.wisc.edu || server=10.42.105.96 || || plnode2.cip.gatech.edu || wings-openflow-2.wail.wisc.edu || server=10.42.105.95 || == One-time prep commands run on each client and server == {{{ sudo yum -y install iperf }}} == Commands run on each server == {{{ server= nice -n 19 iperf -u -B $server -p 5106 -s -i 1 }}} == Commands run on each client == {{{ server= 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). plnode1.cip.gatech.edu: {{{ ------------------------------------------------------------ Client connecting to 10.42.105.96, UDP port 5106 Sending 1470 byte datagrams UDP buffer size: 122 KByte (default) ------------------------------------------------------------ [ 3] local 10.42.105.100 port 53151 connected with 10.42.105.96 port 5106 [ 3] 0.0-13755.2 sec 48.0 GBytes 30.0 Mbits/sec [ 3] Sent 35057619 datagrams [ 3] Server Report: [ 3] 0.0-13754.8 sec 44.2 GBytes 27.6 Mbits/sec 0.078 ms 2767576/35057619 (7.9%) [ 3] 0.0-13754.8 sec 252 datagrams received out-of-order }}} plnode2.cip.gatech.edu: {{{ ------------------------------------------------------------ Client connecting to 10.42.105.95, UDP port 5106 Sending 1470 byte datagrams UDP buffer size: 122 KByte (default) ------------------------------------------------------------ [ 3] local 10.42.105.101 port 39327 connected with 10.42.105.95 port 5106 [ 3] 0.0-13756.4 sec 48.0 GBytes 30.0 Mbits/sec [ 3] Sent 35068319 datagrams [ 3] Server Report: [ 3] 0.0-13756.0 sec 44.4 GBytes 27.7 Mbits/sec 0.252 ms 2666045/35068319 (7.6%) [ 3] 0.0-13756.0 sec 319 datagrams received out-of-order }}} == Analysis == Similar packet loss to Round 3, where we saw 7.5% loss. The results are similar for the two plnodes, so there probably isn't a problem with just one or the other.