test: iperf3 3.16 introduces multiple threads, drop our own implementation of that

Starting from iperf3 version 3.16, -P / --parallel spawns multiple
clients as separate threads, instead of multiple streams serviced by
the same thread.

So we can drop our lib/test implementation to spawn several iperf3
client and server processes and finally simplify things quite a bit.

Adjust number of threads and UDP sending bandwidth to values that seem
to be more or less matching previous throughput tests on my setup.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Tested-by: David Gibson <david@gibson.dropbear.id.au>

6 files changed, 127 insertions, 145 deletions

diff --git a/test/lib/perf_report b/test/lib/perf_report
index 67f9f4e..4d79fa2 100755
--- a/test/lib/perf_report
+++ b/test/lib/perf_report
@@ -18,7 +18,7 @@ PERF_LINK_COUNT=0
 PERF_JS="${LOGDIR}/web/perf.js"
 
 PERF_TEMPLATE_HTML="document.write('"'
-Throughput in Gbps, latency in µs. Threads are <span style="font-family: monospace;">iperf3</span> processes, <i>passt</i> and <i>pasta</i> are currently single-threaded.<br/>
+Throughput in Gbps, latency in µs. Threads are <span style="font-family: monospace;">iperf3</span> threads, <i>passt</i> and <i>pasta</i> are currently single-threaded.<br/>
 Click on numbers to show test execution. Measured at head, commit <span style="font-family: monospace;">__commit__</span>.
 
 <style type="text/CSS">
diff --git a/test/lib/test b/test/lib/test
index 1d571c3..c525f8e 100755
--- a/test/lib/test
+++ b/test/lib/test
@@ -15,18 +15,13 @@
 
 # test_iperf3s() - Start iperf3 server
 # $1:	Destination/server context
-# $2:	Port number, ${i} is translated to process index
-# $3:	Number of processes to run in parallel
+# $2:	Port number
 test_iperf3s() {
 	__sctx="${1}"
 	__port="${2}"
-	__procs="$((${3} - 1))"
 
 	pane_or_context_run_bg "${__sctx}" 				\
-		 'for i in $(seq 0 '${__procs}'); do'			\
-		 '	iperf3 -s -p'${__port}' &'			\
-		 '	echo $! > s${i}.pid; '				\
-		 'done'							\
+		 'iperf3 -s -p'${__port}' & echo $! > s.pid'		\
 
 	sleep 1		# Wait for server to be ready
 }
@@ -36,7 +31,7 @@ test_iperf3s() {
 test_iperf3k() {
 	__sctx="${1}"
 
-	pane_or_context_run "${__sctx}" 'kill -INT $(cat s*.pid); rm s*.pid'
+	pane_or_context_run "${__sctx}" 'kill -INT $(cat s.pid); rm s.pid'
 
 	sleep 3		# Wait for kernel to free up ports
 }
@@ -46,37 +41,29 @@ test_iperf3k() {
 # $2:	Source/client context
 # $3:	Destination name or address for client
 # $4:	Port number, ${i} is translated to process index
-# $5:	Number of processes to run in parallel
-# $6:	Run time, in seconds
+# $5:	Run time, in seconds
 # $@:	Client options
 test_iperf3() {
 	__var="${1}"; shift
 	__cctx="${1}"; shift
 	__dest="${1}"; shift
 	__port="${1}"; shift
-	__procs="$((${1} - 1))"; shift
 	__time="${1}"; shift
 
-	pane_or_context_run "${__cctx}" 'rm -f c*.json'
+	pane_or_context_run "${__cctx}" 'rm -f c.json'
 
         # A 1s wait for connection on what's basically a local link
         # indicates something is pretty wrong
         __timeout=1000
 	pane_or_context_run "${__cctx}" 				\
-		 '('							\
-		 '	for i in $(seq 0 '${__procs}'); do'		\
-		 '		iperf3 -J -c '${__dest}' -p '${__port}	\
-		 '		 --connect-timeout '${__timeout}	\
-		 '		 -t'${__time}' -i0 -T c${i} '"${@}"	\
-                 ' 		> c${i}.json &'				\
-		 '	done;'						\
-		 '	wait'						\
-		 ')'
+		 'iperf3 -J -c '${__dest}' -p '${__port}		\
+		 '	 --connect-timeout '${__timeout}		\
+		 '	 -t'${__time}' -i0 '"${@}"' > c.json'		\
 
 	__jval=".end.sum_received.bits_per_second"
 
 	__bw=$(pane_or_context_output "${__cctx}"			\
-		 'cat c*.json | jq -rMs "map('${__jval}') | add"')
+		 'cat c.json | jq -rMs "map('${__jval}') | add"')
 
 	TEST_ONE_subs="$(list_add_pair "${TEST_ONE_subs}" "__${__var}__" "${__bw}" )"
 }
diff --git a/test/perf/passt_tcp b/test/perf/passt_tcp
index 631a407..14343cb 100644
--- a/test/perf/passt_tcp
+++ b/test/perf/passt_tcp
@@ -37,34 +37,33 @@ hout	FREQ_PROCFS (echo "scale=1"; sed -n 's/cpu MHz.*: \([0-9]*\)\..*$/(\1+10^2\
 hout	FREQ_CPUFREQ (echo "scale=1"; printf '( %i + 10^5 / 2 ) / 10^6\n' $(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq) ) | bc -l
 hout	FREQ [ -n "__FREQ_CPUFREQ__" ] && echo __FREQ_CPUFREQ__ || echo __FREQ_PROCFS__
 
-set	THREADS 1
-set	STREAMS 8
+set	THREADS 4
 set	TIME 10
 set	OMIT 0.1
-set	OPTS -Z -P __STREAMS__ -l 1M -O__OMIT__
+set	OPTS -Z -P __THREADS__ -l 1M -O__OMIT__
 
-info	Throughput in Gbps, latency in µs, one thread at __FREQ__ GHz, __STREAMS__ streams
+info	Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz
 report	passt tcp __THREADS__ __FREQ__
 
 th	MTU 256B 576B 1280B 1500B 9000B 65520B
 
 
 tr	TCP throughput over IPv6: guest to host
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
 bw	-
 bw	-
 guest	ip link set dev __IFNAME__ mtu 1280
-iperf3	BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 4M
+iperf3	BW guest __GW6__%__IFNAME__ 10002 __TIME__ __OPTS__ -w 4M
 bw	__BW__ 1.2 1.5
 guest	ip link set dev __IFNAME__ mtu 1500
-iperf3	BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 4M
+iperf3	BW guest __GW6__%__IFNAME__ 10002 __TIME__ __OPTS__ -w 4M
 bw	__BW__ 1.6 1.8
 guest	ip link set dev __IFNAME__ mtu 9000
-iperf3	BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 8M
+iperf3	BW guest __GW6__%__IFNAME__ 10002 __TIME__ __OPTS__ -w 8M
 bw	__BW__ 4.0 5.0
 guest	ip link set dev __IFNAME__ mtu 65520
-iperf3	BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 16M
+iperf3	BW guest __GW6__%__IFNAME__ 10002 __TIME__ __OPTS__ -w 16M
 bw	__BW__ 7.0 8.0
 
 iperf3k	ns
@@ -90,25 +89,25 @@ gout	LAT tcp_crr --nolog -6 -c -H __GW6__%__IFNAME__ | sed -n 's/^throughput=\(.
 lat	__LAT__ 500 400
 
 tr	TCP throughput over IPv4: guest to host
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
 guest	ip link set dev __IFNAME__ mtu 256
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 1M
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -w 1M
 bw	__BW__ 0.2 0.3
 guest	ip link set dev __IFNAME__ mtu 576
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 1M
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -w 1M
 bw	__BW__ 0.5 0.8
 guest	ip link set dev __IFNAME__ mtu 1280
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 4M
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -w 4M
 bw	__BW__ 1.2 1.5
 guest	ip link set dev __IFNAME__ mtu 1500
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 4M
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -w 4M
 bw	__BW__ 1.6 1.8
 guest	ip link set dev __IFNAME__ mtu 9000
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 8M
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -w 8M
 bw	__BW__ 4.0 5.0
 guest	ip link set dev __IFNAME__ mtu 65520
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 16M
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -w 16M
 bw	__BW__ 7.0 8.0
 
 iperf3k	ns
@@ -134,14 +133,14 @@ gout	LAT tcp_crr --nolog -4 -c -H __GW__ | sed -n 's/^throughput=\(.*\)/\1/p'
 lat	__LAT__ 500 400
 
 tr	TCP throughput over IPv6: host to guest
-iperf3s	guest 100${i}1 __THREADS__
+iperf3s	guest 10001
 
 bw	-
 bw	-
 bw	-
 bw	-
 bw	-
-iperf3	BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__
+iperf3	BW ns ::1 10001 __TIME__ __OPTS__
 bw	__BW__ 6.0 6.8
 
 iperf3k	guest
@@ -170,14 +169,14 @@ lat	__LAT__ 500 350
 
 
 tr	TCP throughput over IPv4: host to guest
-iperf3s	guest 100${i}1 __THREADS__
+iperf3s	guest 10001
 
 bw	-
 bw	-
 bw	-
 bw	-
 bw	-
-iperf3	BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__
+iperf3	BW ns 127.0.0.1 10001 __TIME__ __OPTS__
 bw	__BW__ 6.0 6.8
 
 iperf3k	guest
diff --git a/test/perf/passt_udp b/test/perf/passt_udp
index 10f638f..8919280 100644
--- a/test/perf/passt_udp
+++ b/test/perf/passt_udp
@@ -30,30 +30,29 @@ hout	FREQ_PROCFS (echo "scale=1"; sed -n 's/cpu MHz.*: \([0-9]*\)\..*$/(\1+10^2\
 hout	FREQ_CPUFREQ (echo "scale=1"; printf '( %i + 10^5 / 2 ) / 10^6\n' $(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq) ) | bc -l
 hout	FREQ [ -n "__FREQ_CPUFREQ__" ] && echo __FREQ_CPUFREQ__ || echo __FREQ_PROCFS__
 
-set	THREADS 4
-set	STREAMS 1
+set	THREADS 2
 set	TIME 10
-set	OPTS -u -P __STREAMS__ --pacing-timer 1000
+set	OPTS -u -P __THREADS__ --pacing-timer 1000
 
-info	Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz, one stream each
+info	Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz
 
 report	passt udp __THREADS__ __FREQ__
 
 th	pktlen 256B 576B 1280B 1500B 9000B 65520B
 
 tr	UDP throughput over IPv6: guest to host
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 # (datagram size) = (packet size) - 48: 40 bytes of IPv6 header, 8 of UDP header
 
 bw	-
 bw	-
-iperf3	BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1232
+iperf3	BW guest __GW6__%__IFNAME__ 10002 __TIME__ __OPTS__ -b 3G -l 1232
 bw	__BW__ 0.8 1.2
-iperf3	BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1452
+iperf3	BW guest __GW6__%__IFNAME__ 10002 __TIME__ __OPTS__ -b 4G -l 1452
 bw	__BW__ 1.0 1.5
-iperf3	BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 5G -l 8952
+iperf3	BW guest __GW6__%__IFNAME__ 10002 __TIME__ __OPTS__ -b 8G -l 8952
 bw	__BW__ 4.0 5.0
-iperf3	BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 7G -l 64372
+iperf3	BW guest __GW6__%__IFNAME__ 10002 __TIME__ __OPTS__ -b 15G -l 64372
 bw	__BW__ 4.0 5.0
 
 iperf3k	ns
@@ -70,20 +69,20 @@ lat	__LAT__ 200 150
 
 
 tr	UDP throughput over IPv4: guest to host
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 # (datagram size) = (packet size) - 28: 20 bytes of IPv4 header, 8 of UDP header
 
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 500M -l 228
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -b 1G -l 228
 bw	__BW__ 0.0 0.0
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 1G -l 548
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -b 2G -l 548
 bw	__BW__ 0.4 0.6
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1252
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -b 3G -l 1252
 bw	__BW__ 0.8 1.2
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1472
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -b 4G -l 1472
 bw	__BW__ 1.0 1.5
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 6G -l 8972
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -b 8G -l 8972
 bw	__BW__ 4.0 5.0
-iperf3	BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 7G -l 65492
+iperf3	BW guest __GW__ 10002 __TIME__ __OPTS__ -b 15G -l 65492
 bw	__BW__ 4.0 5.0
 
 iperf3k	ns
@@ -100,18 +99,18 @@ lat	__LAT__ 200 150
 
 
 tr	UDP throughput over IPv6: host to guest
-iperf3s	guest 100${i}1 __THREADS__
+iperf3s	guest 10001
 # (datagram size) = (packet size) - 48: 40 bytes of IPv6 header, 8 of UDP header
 
 bw	-
 bw	-
-iperf3	BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1232
+iperf3	BW ns ::1 10001 __TIME__ __OPTS__ -b 3G -l 1232
 bw	__BW__ 0.8 1.2
-iperf3	BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1452
+iperf3	BW ns ::1 10001 __TIME__ __OPTS__ -b 4G -l 1452
 bw	__BW__ 1.0 1.5
-iperf3	BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 8952
+iperf3	BW ns ::1 10001 __TIME__ __OPTS__ -b 8G -l 8952
 bw	__BW__ 3.0 4.0
-iperf3	BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 64372
+iperf3	BW ns ::1 10001 __TIME__ __OPTS__ -b 15G -l 64372
 bw	__BW__ 3.0 4.0
 
 iperf3k	guest
@@ -129,20 +128,20 @@ lat	__LAT__ 200 150
 
 
 tr	UDP throughput over IPv4: host to guest
-iperf3s	guest 100${i}1 __THREADS__
+iperf3s	guest 10001
 # (datagram size) = (packet size) - 28: 20 bytes of IPv4 header, 8 of UDP header
 
-iperf3	BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 1G -l 228
+iperf3	BW ns 127.0.0.1 10001 __TIME__ __OPTS__ -b 1G -l 228
 bw	__BW__ 0.0 0.0
-iperf3	BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 1G -l 548
+iperf3	BW ns 127.0.0.1 10001 __TIME__ __OPTS__ -b 2G -l 548
 bw	__BW__ 0.4 0.6
-iperf3	BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1252
+iperf3	BW ns 127.0.0.1 10001 __TIME__ __OPTS__ -b 3G -l 1252
 bw	__BW__ 0.8 1.2
-iperf3	BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1472
+iperf3	BW ns 127.0.0.1 10001 __TIME__ __OPTS__ -b 4G -l 1472
 bw	__BW__ 1.0 1.5
-iperf3	BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 8972
+iperf3	BW ns 127.0.0.1 10001 __TIME__ __OPTS__ -b 8G -l 8972
 bw	__BW__ 3.0 4.0
-iperf3	BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 65492
+iperf3	BW ns 127.0.0.1 10001 __TIME__ __OPTS__ -b 15G -l 65492
 bw	__BW__ 3.0 4.0
 
 iperf3k	guest
diff --git a/test/perf/pasta_tcp b/test/perf/pasta_tcp
index 7777532..8d2f911 100644
--- a/test/perf/pasta_tcp
+++ b/test/perf/pasta_tcp
@@ -21,26 +21,25 @@ ns	/sbin/sysctl -w net.ipv4.tcp_wmem="131072 524288 134217728"
 ns	/sbin/sysctl -w net.ipv4.tcp_timestamps=0
 
 
-set	THREADS 2
-set	STREAMS 2
+set	THREADS 4
 set	TIME 10
 set	OMIT 0.1
-set	OPTS -Z -w 4M -l 1M -P __STREAMS__ -O__OMIT__
+set	OPTS -Z -w 4M -l 1M -P __THREADS__ -O__OMIT__
 
 hout	FREQ_PROCFS (echo "scale=1"; sed -n 's/cpu MHz.*: \([0-9]*\)\..*$/(\1+10^2\/2)\/10^3/p' /proc/cpuinfo) | bc -l | head -n1
 hout	FREQ_CPUFREQ (echo "scale=1"; printf '( %i + 10^5 / 2 ) / 10^6\n' $(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq) ) | bc -l
 hout	FREQ [ -n "__FREQ_CPUFREQ__" ] && echo __FREQ_CPUFREQ__ || echo __FREQ_PROCFS__
 
 
-info	Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz, __STREAMS__ streams each
+info	Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz
 report	pasta lo_tcp __THREADS__ __FREQ__
 
 th	MTU 65535B
 
 tr	TCP throughput over IPv6: ns to host
-iperf3s	host 100${i}3 __THREADS__
+iperf3s	host 10003
 
-iperf3	BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__
+iperf3	BW ns ::1 10003 __THREADS__ __TIME__ __OPTS__
 bw	__BW__ 15.0 20.0
 
 iperf3k	host
@@ -59,9 +58,9 @@ lat	__LAT__ 500 350
 
 
 tr	TCP throughput over IPv4: ns to host
-iperf3s	host 100${i}3 __THREADS__
+iperf3s	host 10003
 
-iperf3	BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__
+iperf3	BW ns 127.0.0.1 10003 __THREADS__ __TIME__ __OPTS__
 bw	__BW__ 15.0 20.0
 
 iperf3k	host
@@ -79,9 +78,9 @@ hostw
 lat	__LAT__ 500 350
 
 tr	TCP throughput over IPv6: host to ns
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
-iperf3	BW host ::1 100${i}2 __THREADS__ __TIME__ __OPTS__
+iperf3	BW host ::1 10002 __TIME__ __OPTS__
 bw	__BW__ 15.0 20.0
 
 iperf3k	ns
@@ -100,9 +99,9 @@ lat	__LAT__ 1000 700
 
 
 tr	TCP throughput over IPv4: host to ns
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
-iperf3	BW host 127.0.0.1 100${i}2 __THREADS__ __TIME__ __OPTS__
+iperf3	BW host 127.0.0.1 10002 __TIME__ __OPTS__
 bw	__BW__ 15.0 20.0
 
 iperf3k	ns
@@ -126,29 +125,28 @@ test	pasta: throughput and latency (connections via tap)
 nsout	GW ip -j -4 route show|jq -rM '.[] | select(.dst == "default").gateway'
 nsout	GW6 ip -j -6 route show|jq -rM '.[] | select(.dst == "default").gateway'
 nsout	IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
-set	THREADS 1
-set	STREAMS 2
-set	OPTS -Z -P __STREAMS__ -i1 -O__OMIT__
+set	THREADS 2
+set	OPTS -Z -P __THREADS__ -i1 -O__OMIT__
 
-info	Throughput in Gbps, latency in µs, one thread at __FREQ__ GHz, __STREAMS__ streams
+info	Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz
 report	pasta tap_tcp __THREADS__ __FREQ__
 
 th	MTU 1500B 4000B 16384B 65520B
 
 tr	TCP throughput over IPv6: ns to host
-iperf3s	host 100${i}3 __THREADS__
+iperf3s	host 10003
 
 ns	ip link set dev __IFNAME__ mtu 1500
-iperf3	BW ns __GW6__%__IFNAME__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -w 512k
+iperf3	BW ns __GW6__%__IFNAME__ 10003 __TIME__ __OPTS__ -w 512k
 bw	__BW__ 0.2 0.4
 ns	ip link set dev __IFNAME__ mtu 4000
-iperf3	BW ns __GW6__%__IFNAME__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -w 1M
+iperf3	BW ns __GW6__%__IFNAME__ 10003 __TIME__ __OPTS__ -w 1M
 bw	__BW__ 0.3 0.5
 ns	ip link set dev __IFNAME__ mtu 16384
-iperf3	BW ns __GW6__%__IFNAME__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -w 8M
+iperf3	BW ns __GW6__%__IFNAME__ 10003 __TIME__ __OPTS__ -w 8M
 bw	__BW__ 1.5 2.0
 ns	ip link set dev __IFNAME__ mtu 65520
-iperf3	BW ns __GW6__%__IFNAME__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -w 8M
+iperf3	BW ns __GW6__%__IFNAME__ 10003 __TIME__ __OPTS__ -w 8M
 bw	__BW__ 2.0 2.5
 
 iperf3k	host
@@ -173,19 +171,19 @@ lat	__LAT__ 1500 500
 
 
 tr	TCP throughput over IPv4: ns to host
-iperf3s	host 100${i}3 __THREADS__
+iperf3s	host 10003
 
 ns	ip link set dev __IFNAME__ mtu 1500
-iperf3	BW ns __GW__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -w 512k
+iperf3	BW ns __GW__ 10003 __TIME__ __OPTS__ -w 512k
 bw	__BW__ 0.2 0.4
 ns	ip link set dev __IFNAME__ mtu 4000
-iperf3	BW ns __GW__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -w 1M
+iperf3	BW ns __GW__ 10003 __TIME__ __OPTS__ -w 1M
 bw	__BW__ 0.3 0.5
 ns	ip link set dev __IFNAME__ mtu 16384
-iperf3	BW ns __GW__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -w 8M
+iperf3	BW ns __GW__ 10003 __TIME__ __OPTS__ -w 8M
 bw	__BW__ 1.5 2.0
 ns	ip link set dev __IFNAME__ mtu 65520
-iperf3	BW ns __GW__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -w 8M
+iperf3	BW ns __GW__ 10003 __TIME__ __OPTS__ -w 8M
 bw	__BW__ 2.0 2.5
 
 iperf3k	host
@@ -209,14 +207,14 @@ hostw
 lat	__LAT__ 1500 500
 
 tr	TCP throughput over IPv6: host to ns
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
 nsout	IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
 nsout	ADDR6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global" and .prefixlen == 64).local'
 bw	-
 bw	-
 bw	-
-iperf3	BW host __ADDR6__ 100${i}2 __THREADS__ __TIME__ __OPTS__
+iperf3	BW host __ADDR6__ 10002 __TIME__ __OPTS__
 bw	__BW__ 8.0 10.0
 
 iperf3k	ns
@@ -242,13 +240,13 @@ lat	__LAT__ 5000 10000
 
 
 tr	TCP throughput over IPv4: host to ns
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
 nsout	ADDR ip -j -4 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[0].local'
 bw	-
 bw	-
 bw	-
-iperf3	BW host __ADDR__ 100${i}2 __THREADS__ __TIME__ __OPTS__
+iperf3	BW host __ADDR__ 10002 __TIME__ __OPTS__
 bw	__BW__ 8.0 10.0
 
 iperf3k	ns
diff --git a/test/perf/pasta_udp b/test/perf/pasta_udp
index 5e3db1e..6acbfd3 100644
--- a/test/perf/pasta_udp
+++ b/test/perf/pasta_udp
@@ -21,11 +21,10 @@ hout	FREQ_CPUFREQ (echo "scale=1"; printf '( %i + 10^5 / 2 ) / 10^6\n' $(cat /sy
 hout	FREQ [ -n "__FREQ_CPUFREQ__" ] && echo __FREQ_CPUFREQ__ || echo __FREQ_PROCFS__
 
 set	THREADS 1
-set	STREAMS 4
 set	TIME 10
-set	OPTS -u -P __STREAMS__
+set	OPTS -u -P __THREADS__
 
-info	Throughput in Gbps, latency in µs, one thread at __FREQ__ GHz, __STREAMS__ streams
+info	Throughput in Gbps, latency in µs, one thread at __FREQ__ GHz
 
 report	pasta lo_udp 1 __FREQ__
 
@@ -33,16 +32,16 @@ th	pktlen 1500B 4000B 16384B 65535B
 
 
 tr	UDP throughput over IPv6: ns to host
-iperf3s	host 100${i}3 __THREADS__
+iperf3s	host 10003
 # (datagram size) = (packet size) - 48: 40 bytes of IPv6 header, 8 of UDP header
 
-iperf3	BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1452
+iperf3	BW ns ::1 10003 __TIME__ __OPTS__ -b 5G -l 1452
 bw	__BW__ 1.0 1.5
-iperf3	BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 3G -l 3972
+iperf3	BW ns ::1 10003 __TIME__ __OPTS__ -b 10G -l 3972
 bw	__BW__ 1.2 1.8
-iperf3	BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 10G -l 16336
+iperf3	BW ns ::1 10003 __TIME__ __OPTS__ -b 30G -l 16336
 bw	__BW__ 5.0 6.0
-iperf3	BW ns ::1 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 15G -l 65487
+iperf3	BW ns ::1 10003 __TIME__ __OPTS__ -b 40G -l 65487
 bw	__BW__ 7.0 9.0
 
 iperf3k	host
@@ -58,16 +57,16 @@ lat	__LAT__ 200 150
 
 
 tr	UDP throughput over IPv4: ns to host
-iperf3s	host 100${i}3 __THREADS__
+iperf3s	host 10003
 # (datagram size) = (packet size) - 28: 20 bytes of IPv4 header, 8 of UDP header
 
-iperf3	BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1372
+iperf3	BW ns 127.0.0.1 10003 __TIME__ __OPTS__ -b 5G -l 1372
 bw	__BW__ 1.0 1.5
-iperf3	BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 3G -l 3972
+iperf3	BW ns 127.0.0.1 10003 __TIME__ __OPTS__ -b 10G -l 3972
 bw	__BW__ 1.2 1.8
-iperf3	BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 10G -l 16356
+iperf3	BW ns 127.0.0.1 10003 __TIME__ __OPTS__ -b 30G -l 16356
 bw	__BW__ 5.0 6.0
-iperf3	BW ns 127.0.0.1 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 15G -l 65507
+iperf3	BW ns 127.0.0.1 10003 __TIME__ __OPTS__ -b 40G -l 65507
 bw	__BW__ 7.0 9.0
 
 iperf3k	host
@@ -83,15 +82,15 @@ lat	__LAT__ 200 150
 
 
 tr	UDP throughput over IPv6: host to ns
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
-iperf3	BW host ::1 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1452
+iperf3	BW host ::1 10002 __TIME__ __OPTS__ -b 5G -l 1452
 bw	__BW__ 1.0 1.5
-iperf3	BW host ::1 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 3972
+iperf3	BW host ::1 10002 __TIME__ __OPTS__ -b 10G -l 3972
 bw	__BW__ 1.2 1.8
-iperf3	BW host ::1 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 10G -l 16336
+iperf3	BW host ::1 10002 __TIME__ __OPTS__ -b 30G -l 16336
 bw	__BW__ 5.0 6.0
-iperf3	BW host ::1 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 15G -l 16336
+iperf3	BW host ::1 10002 __TIME__ __OPTS__ -b 40G -l 65487
 bw	__BW__ 7.0 9.0
 
 iperf3k	ns
@@ -107,14 +106,14 @@ lat	__LAT__ 200 150
 
 
 tr	UDP throughput over IPv4: host to ns
-iperf3s	ns 100${i}2 __THREADS__
-iperf3	BW host 127.0.0.1 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1372
+iperf3s	ns 10002
+iperf3	BW host 127.0.0.1 10002 __TIME__ __OPTS__ -b 5G -l 1372
 bw	__BW__ 1.0 1.5
-iperf3	BW host 127.0.0.1 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 3972
+iperf3	BW host 127.0.0.1 10002 __TIME__ __OPTS__ -b 10G -l 3972
 bw	__BW__ 1.2 1.8
-iperf3	BW host 127.0.0.1 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 10G -l 16356
+iperf3	BW host 127.0.0.1 10002 __TIME__ __OPTS__ -b 30G -l 16356
 bw	__BW__ 5.0 6.0
-iperf3	BW host 127.0.0.1 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 15G -l 65507
+iperf3	BW host 127.0.0.1 10002 __TIME__ __OPTS__ -b 40G -l 65507
 bw	__BW__ 7.0 9.0
 
 iperf3k	ns
@@ -138,22 +137,22 @@ nsout	GW ip -j -4 route show|jq -rM '.[] | select(.dst == "default").gateway'
 nsout	GW6 ip -j -6 route show|jq -rM '.[] | select(.dst == "default").gateway'
 nsout	IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
 
-info	Throughput in Gbps, latency in µs, one thread at __FREQ__ GHz, __STREAMS__ streams
+info	Throughput in Gbps, latency in µs, one thread at __FREQ__ GHz
 report	pasta tap_udp 1 __FREQ__
 
 th	pktlen 1500B 4000B 16384B 65520B
 
 tr	UDP throughput over IPv6: ns to host
-iperf3s	host 100${i}3 __THREADS__
+iperf3s	host 10003
 # (datagram size) = (packet size) - 48: 40 bytes of IPv6 header, 8 of UDP header
 
-iperf3	BW ns __GW6__%__IFNAME__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1472
+iperf3	BW ns __GW6__%__IFNAME__ 10003 __TIME__ __OPTS__ -b 8G -l 1472
 bw	__BW__ 0.3 0.5
-iperf3	BW ns __GW6__%__IFNAME__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 3G -l 3972
+iperf3	BW ns __GW6__%__IFNAME__ 10003 __TIME__ __OPTS__ -b 12G -l 3972
 bw	__BW__ 0.5 0.8
-iperf3	BW ns __GW6__%__IFNAME__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 4G -l 16356
+iperf3	BW ns __GW6__%__IFNAME__ 10003 __TIME__ __OPTS__ -b 20G -l 16356
 bw	__BW__ 3.0 4.0
-iperf3	BW ns __GW6__%__IFNAME__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 6G -l 65472
+iperf3	BW ns __GW6__%__IFNAME__ 10003 __TIME__ __OPTS__ -b 30G -l 65472
 bw	__BW__ 6.0 7.0
 
 iperf3k	host
@@ -169,16 +168,16 @@ lat	__LAT__ 200 150
 
 
 tr	UDP throughput over IPv4: ns to host
-iperf3s	host 100${i}3 __THREADS__
+iperf3s	host 10003
 # (datagram size) = (packet size) - 28: 20 bytes of IPv4 header, 8 of UDP header
 
-iperf3	BW ns __GW__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1472
+iperf3	BW ns __GW__ 10003 __TIME__ __OPTS__ -b 8G -l 1472
 bw	__BW__ 0.3 0.5
-iperf3	BW ns __GW__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 3G -l 3972
+iperf3	BW ns __GW__ 10003 __TIME__ __OPTS__ -b 12G -l 3972
 bw	__BW__ 0.5 0.8
-iperf3	BW ns __GW__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 4G -l 16356
+iperf3	BW ns __GW__ 10003 __TIME__ __OPTS__ -b 20G -l 16356
 bw	__BW__ 3.0 4.0
-iperf3	BW ns __GW__ 100${i}3 __THREADS__ __TIME__ __OPTS__ -b 6G -l 65492
+iperf3	BW ns __GW__ 10003 __TIME__ __OPTS__ -b 30G -l 65492
 bw	__BW__ 6.0 7.0
 
 iperf3k	host
@@ -193,17 +192,17 @@ hostw
 lat	__LAT__ 200 150
 
 tr	UDP throughput over IPv6: host to ns
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
 nsout	IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
 nsout	ADDR6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global" and .prefixlen == 64).local'
-iperf3	BW host __ADDR6__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1472
+iperf3	BW host __ADDR6__ 10002 __TIME__ __OPTS__ -b 8G -l 1472
 bw	__BW__ 0.3 0.5
-iperf3	BW host __ADDR6__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 3972
+iperf3	BW host __ADDR6__ 10002 __TIME__ __OPTS__ -b 12G -l 3972
 bw	__BW__ 0.5 0.8
-iperf3	BW host __ADDR6__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 4G -l 16356
+iperf3	BW host __ADDR6__ 10002 __TIME__ __OPTS__ -b 20G -l 16356
 bw	__BW__ 3.0 4.0
-iperf3	BW host __ADDR6__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 15G -l 65472
+iperf3	BW host __ADDR6__ 10002 __TIME__ __OPTS__ -b 30G -l 65472
 bw	__BW__ 7.0 9.0
 
 iperf3k	ns
@@ -219,16 +218,16 @@ lat	__LAT__ 200 150
 
 
 tr	UDP throughput over IPv4: host to ns
-iperf3s	ns 100${i}2 __THREADS__
+iperf3s	ns 10002
 
 nsout	ADDR ip -j -4 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[0].local'
-iperf3	BW host __ADDR__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1472
+iperf3	BW host __ADDR__ 10002 __TIME__ __OPTS__ -b 8G -l 1472
 bw	__BW__ 0.3 0.5
-iperf3	BW host __ADDR__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 3972
+iperf3	BW host __ADDR__ 10002 __TIME__ __OPTS__ -b 12G -l 3972
 bw	__BW__ 0.5 0.8
-iperf3	BW host __ADDR__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 4G -l 16356
+iperf3	BW host __ADDR__ 10002 __TIME__ __OPTS__ -b 20G -l 16356
 bw	__BW__ 3.0 4.0
-iperf3	BW host __ADDR__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 15G -l 65492
+iperf3	BW host __ADDR__ 10002 __TIME__ __OPTS__ -b 30G -l 65492
 bw	__BW__ 7.0 9.0
 
 iperf3k	ns