[netperf-dev] netperf2 commit notice r550 - in trunk: doc/examples src

[raj at netperf.org]

Author: raj
Date: 2012-03-30 16:12:09 -0700 (Fri, 30 Mar 2012)
New Revision: 550

Added:
   trunk/doc/examples/bloat.sh
Modified:
   trunk/src/nettest_omni.c
Log:
a script to demonstrate the so called bufferbloat issue

Added: trunk/doc/examples/bloat.sh
===================================================================
--- trunk/doc/examples/bloat.sh	                        (rev 0)
+++ trunk/doc/examples/bloat.sh	2012-03-30 23:12:09 UTC (rev 550)
@@ -0,0 +1,64 @@
+# this is a quick and dirty script to run a netperf TCP_RR and
+# TCP_STREAM test concurrently to allow one to see the effect of
+# buffer bloat on latency.  We assume that netperf has been compiled
+# with demo-mode enabled via ./configure --enable-demo
+
+NETPERF=`which netperf`
+if [ $? -ne 0 ]
+then
+    echo "Unable to find a netperf binary."
+    exit -1
+fi
+
+# first, start the TCP_RR test
+RR_START=`date +%s`
+echo "Starting netperf TCP_RR at $RR_START"
+netperf -H $1 -l 7200 -t TCP_RR -D 1 -v 2 -- -r 1 2>&1 > netperf_rr.out &
+
+# sleep 30 seconds
+sleep 30
+
+# now run the TCP_STREAM test
+
+STREAM_START=`date +%s`
+echo "Starting netperf TCP_STREAM test at $STREAM_START"
+netperf -H $1 -l 30 -t TCP_STREAM -D 1 -v 2 -- -m 64K 2>&1 > netperf_stream.out
+STREAM_STOP=`date +%s`
+echo "Netperf TCP_STREAM test stopped at $STREAM_STOP"
+
+# sleep another 30 seconds
+sleep 30
+
+pkill -ALRM netperf
+RR_STOP=`date +%s`
+echo "Netperf TCP_RR test stopped at $RR_STOP"
+
+RRDTOOL=`which rrdtool`
+if [ $? -ne 0 ]
+then
+    echo "Unable to find rrdtool.  You will have to post-process the results by hand"
+    exit 0
+fi
+
+MIN_TIMESTAMP=`grep Interim netperf_rr.out | head -1 | awk '{print int($10)}'`
+MAX_TIMESTAMP=`grep Interim netperf_rr.out | tail -1 | awk '{print int($10)}'`
+MAX_INTERVAL=`grep Interim netperf_rr.out | awk 'BEGIN{max=0.0} ($6 > max) {max = $6}END{print int(max) + 1}'`
+LENGTH=`expr $MAX_TIMESTAMP - $MIN_TIMESTAMP`
+
+$RRDTOOL create netperf_rr.rrd --step 1 --start $MIN_TIMESTAMP \
+    DS:tps:GAUGE:$MAX_INTERVAL:U:U RRA:AVERAGE:0.5:1:$LENGTH
+
+# now fill it
+awk -v rrdtool=$RRDTOOL '($1 == "Interim"){printf("%s update netperf_rr.rrd %.3f:%f\n",rrdtool,$10,$3)}' netperf_rr.out | sh
+
+# now graph it.  if you change the runtimes you should probably change
+# the width of the chart via the -w option
+$RRDTOOL graph bloat.png --imgformat PNG \
+    -w 800 -h 400 \
+    --lower-limit 0 \
+    --start $MIN_TIMESTAMP --end $MAX_TIMESTAMP \
+    -t "Effect of bulk transfer on latency" \
+    -v "Seconds" \
+    DEF:trans=netperf_rr.rrd:tps:AVERAGE \
+    CDEF:latency=1.0,trans,/ \
+    LINE2:latency#00FF0080:Latency


Property changes on: trunk/doc/examples/bloat.sh
___________________________________________________________________
Added: svn:executable
   + *

Modified: trunk/src/nettest_omni.c
===================================================================
--- trunk/src/nettest_omni.c	2012-03-30 01:25:10 UTC (rev 549)
+++ trunk/src/nettest_omni.c	2012-03-30 23:12:09 UTC (rev 550)
@@ -4969,7 +4969,8 @@
   need_to_accept = (omni_request->protocol != IPPROTO_UDP);
 
   /* we need to hang a listen for everything that needs at least one
-     accept */
+     accept. the age-old constant of 5 is probably OK for our purposes
+     but does not necessarily represent best practice */
   if (need_to_accept) {
     if (listen(s_listen, 5) == SOCKET_ERROR) {
       netperf_response.content.serv_errno = errno;