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passt/test/perf/passt_udp
David Gibson f94adb121a test/perf: Explicitly control UDP packet length, instead of MTU 
Packet size can make a big difference to UDP throughput, so it makes sense
to measure it for a variety of different sizes.  Currently we do this by
adjusting the MTU on the relevant interface before running iperf3.

However, the UDP packet size has no inherent connection to the MTU - it's
controlled by the sender, and the MTU just affects whether the packet will
make it through or be fragmented.  The only reason adjusting the MTU works
is because iperf3 bases its default packet size on the (path) MTU.

We can test this more simply by using the -l option to the iperf3 client
to directly control the packet size, instead of adjusting the MTU.

As well as simplifying this lets us test different packet sizes for host to
ns traffic.  We couldn't do that previously because we don't have
permission to change the MTU on the host.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-11-07 09:56:16 +01:00

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# SPDX-License-Identifier: GPL-2.0-or-later
#
# PASST - Plug A Simple Socket Transport
# for qemu/UNIX domain socket mode
#
# PASTA - Pack A Subtle Tap Abstraction
# for network namespace/tap device mode
#
# test/perf/passt_udp - Check UDP performance in passt mode
#
# Copyright (c) 2021 Red Hat GmbH
# Author: Stefano Brivio <sbrivio@redhat.com>
gtools /sbin/sysctl ip jq nproc sleep iperf3 udp_rr # From neper
nstools ip jq sleep iperf3 udp_rr
htools bc head sed
test passt: throughput and latency
guest /sbin/sysctl -w net.core.rmem_max=16777216
guest /sbin/sysctl -w net.core.wmem_max=16777216
guest /sbin/sysctl -w net.core.rmem_default=16777216
guest /sbin/sysctl -w net.core.wmem_default=16777216
gout GW ip -j -4 route show|jq -rM '.[] | select(.dst == "default").gateway'
gout GW6 ip -j -6 route show|jq -rM '.[] | select(.dst == "default").gateway'
gout IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
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' $(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq) ) | bc -l
hout FREQ [ -n "__FREQ_CPUFREQ__" ] && echo __FREQ_CPUFREQ__ || echo __FREQ_PROCFS__
set THREADS 4
set STREAMS 1
set TIME 10
set OPTS -u -P __STREAMS__ --pacing-timer 1000
info Throughput in Gbps, latency in µs, __THREADS__ threads at __FREQ__ GHz, one stream each
report passt udp __THREADS__ __FREQ__
th pktlen 256B 576B 1280B 1500B 9000B 65520B
tr UDP throughput over IPv6: guest to host
iperf3s ns 100${i}2 __THREADS__
# (datagram size) = (packet size) - 48: 40 bytes of IPv6 header, 8 of UDP header
bw -
bw -
iperf3 BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1232
bw __BW__ 0.8 1.2
iperf3 BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1452
bw __BW__ 1.0 1.5
iperf3 BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 5G -l 8952
bw __BW__ 4.0 5.0
iperf3 BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 7G -l 64372
bw __BW__ 4.0 5.0
iperf3k ns
tl UDP RR latency over IPv6: guest to host
lat -
lat -
lat -
lat -
lat -
nsb udp_rr --nolog -6
gout LAT udp_rr --nolog -6 -c -H __GW6__%__IFNAME__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 200 150
tr UDP throughput over IPv4: guest to host
iperf3s ns 100${i}2 __THREADS__
# (datagram size) = (packet size) - 28: 20 bytes of IPv4 header, 8 of UDP header
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 500M -l 228
bw __BW__ 0.0 0.0
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 1G -l 548
bw __BW__ 0.4 0.6
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1252
bw __BW__ 0.8 1.2
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1472
bw __BW__ 1.0 1.5
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 6G -l 8972
bw __BW__ 4.0 5.0
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 7G -l 65492
bw __BW__ 4.0 5.0
iperf3k ns
tl UDP RR latency over IPv4: guest to host
lat -
lat -
lat -
lat -
lat -
nsb udp_rr --nolog -4
gout LAT udp_rr --nolog -4 -c -H __GW__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 200 150
tr UDP throughput over IPv6: host to guest
iperf3s guest 100${i}1 __THREADS__
# (datagram size) = (packet size) - 48: 40 bytes of IPv6 header, 8 of UDP header
bw -
bw -
iperf3 BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1232
bw __BW__ 0.8 1.2
iperf3 BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 2G -l 1452
bw __BW__ 1.0 1.5
iperf3 BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 8952
bw __BW__ 3.0 4.0
iperf3 BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 64372
bw __BW__ 3.0 4.0
iperf3k guest
tl UDP RR latency over IPv6: host to guest
lat -
lat -
lat -
lat -
lat -
guestb udp_rr --nolog -P 10001 -C 10011 -6
sleep 1
nsout LAT udp_rr --nolog -P 10001 -C 10011 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 200 150
tr UDP throughput over IPv4: host to guest
iperf3s guest 100${i}1 __THREADS__
# (datagram size) = (packet size) - 28: 20 bytes of IPv4 header, 8 of UDP header
iperf3 BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 1G -l 228
bw __BW__ 0.0 0.0
iperf3 BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 1G -l 548
bw __BW__ 0.4 0.6
iperf3 BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1252
bw __BW__ 0.8 1.2
iperf3 BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 1472
bw __BW__ 1.0 1.5
iperf3 BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 8972
bw __BW__ 3.0 4.0
iperf3 BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__ -b 3G -l 65492
bw __BW__ 3.0 4.0
iperf3k guest
tl UDP RR latency over IPv4: host to guest
lat -
lat -
lat -
lat -
lat -
guestb udp_rr --nolog -P 10001 -C 10011 -4
sleep 1
nsout LAT udp_rr --nolog -P 10001 -C 10011 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 200 150
te
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