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passt/test/perf/passt_tcp
David Gibson 53ff387156 test/perf: Simplify calculation of "omit" time for TCP throughput 
For the TCP throughput tests, we use iperf3's -O "omit" option which
ignores results for the given time at the beginning of the test.  Currently
we calculate this as 1/6th of the test measurement time.  The purpose of
-O, however, is to skip over the TCP slow start period, which in no way
depends on the overall length of the test.

The slow start time is roughly speaking
    log_2 ( max_window_size / MSS ) * round_trip_time
These factors all vary between tests and machines we're running on, but we
can estimate some reasonable bounds for them:
  * The maximum window size is bounded by the buffer sizes at each end,
    which shouldn't exceed 16MiB
  * The mss varies with the MTU we use, but the smallest we use in tests is
    ~256 bytes
  * Round trip time will vary with the system, but with these essentially
    local transfers it will typically be well under 1ms (on my laptop it is
    closer to 0.03ms)

That gives a worst case slow start time of about 16ms.  Setting an omit
time of 0.1s uniformly is therefore more than enough, and substantially
smaller than what we calculate now for the default case (10s / 6 ~= 1.7s).

This reduces total time for the standard benchmark run by around 30s.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-11-07 09:56:24 +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_tcp - Check TCP performance in passt mode
#
# Copyright (c) 2021 Red Hat GmbH
# Author: Stefano Brivio <sbrivio@redhat.com>
gtools /sbin/sysctl ip jq nproc seq sleep iperf3 tcp_rr tcp_crr # From neper
nstools /sbin/sysctl ip jq nproc seq sleep iperf3 tcp_rr tcp_crr
htools bc head sed seq
test passt: throughput and latency
guest /sbin/sysctl -w net.core.rmem_max=536870912
guest /sbin/sysctl -w net.core.wmem_max=536870912
guest /sbin/sysctl -w net.core.rmem_default=33554432
guest /sbin/sysctl -w net.core.wmem_default=33554432
guest /sbin/sysctl -w net.ipv4.tcp_rmem="4096 131072 268435456"
guest /sbin/sysctl -w net.ipv4.tcp_wmem="4096 131072 268435456"
guest /sbin/sysctl -w net.ipv4.tcp_timestamps=0
ns /sbin/sysctl -w net.ipv4.tcp_rmem="4096 524288 134217728"
ns /sbin/sysctl -w net.ipv4.tcp_wmem="4096 524288 134217728"
ns /sbin/sysctl -w net.ipv4.tcp_timestamps=0
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' $(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq) ) | bc -l
hout FREQ [ -n "__FREQ_CPUFREQ__" ] && echo __FREQ_CPUFREQ__ || echo __FREQ_PROCFS__
set THREADS 1
set STREAMS 8
set TIME 10
set OMIT 0.1
set OPTS -Z -P __STREAMS__ -l 1M -O__OMIT__
info Throughput in Gbps, latency in µs, one thread at __FREQ__ GHz, __STREAMS__ streams
report passt tcp __THREADS__ __FREQ__
th MTU 256B 576B 1280B 1500B 9000B 65520B
tr TCP throughput over IPv6: guest to host
iperf3s ns 100${i}2 __THREADS__
bw -
bw -
guest ip link set dev __IFNAME__ mtu 1280
iperf3 BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 4M
bw __BW__ 1.2 1.5
guest ip link set dev __IFNAME__ mtu 1500
iperf3 BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 4M
bw __BW__ 1.6 1.8
guest ip link set dev __IFNAME__ mtu 9000
iperf3 BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 8M
bw __BW__ 4.0 5.0
guest ip link set dev __IFNAME__ mtu 65520
iperf3 BW guest __GW6__%__IFNAME__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 16M
bw __BW__ 7.0 8.0
iperf3k ns
tl TCP RR latency over IPv6: guest to host
lat -
lat -
lat -
lat -
lat -
nsb tcp_rr --nolog -6
gout LAT tcp_rr --nolog -6 -c -H __GW6__%__IFNAME__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 200 150
tl TCP CRR latency over IPv6: guest to host
lat -
lat -
lat -
lat -
lat -
nsb tcp_crr --nolog -6
gout LAT tcp_crr --nolog -6 -c -H __GW6__%__IFNAME__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 500 400
tr TCP throughput over IPv4: guest to host
iperf3s ns 100${i}2 __THREADS__
guest ip link set dev __IFNAME__ mtu 256
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 1M
bw __BW__ 0.2 0.3
guest ip link set dev __IFNAME__ mtu 576
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 1M
bw __BW__ 0.5 0.8
guest ip link set dev __IFNAME__ mtu 1280
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 4M
bw __BW__ 1.2 1.5
guest ip link set dev __IFNAME__ mtu 1500
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 4M
bw __BW__ 1.6 1.8
guest ip link set dev __IFNAME__ mtu 9000
iperf3 BW guest __GW__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -w 8M
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
bw __BW__ 7.0 8.0
iperf3k ns
tl TCP RR latency over IPv4: guest to host
lat -
lat -
lat -
lat -
lat -
nsb tcp_rr --nolog -4
gout LAT tcp_rr --nolog -4 -c -H __GW__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 200 150
tl TCP CRR latency over IPv4: guest to host
lat -
lat -
lat -
lat -
lat -
nsb tcp_crr --nolog -4
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${i}1 __THREADS__
bw -
bw -
bw -
bw -
bw -
iperf3 BW ns ::1 100${i}1 __THREADS__ __TIME__ __OPTS__
bw __BW__ 6.0 6.8
iperf3k guest
tl TCP RR latency over IPv6: host to guest
lat -
lat -
lat -
lat -
lat -
guestb tcp_rr --nolog -P 10001 -C 10011 -6
sleep 1
nsout LAT tcp_rr --nolog -P 10001 -C 10011 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 200 150
tl TCP CRR latency over IPv6: host to guest
lat -
lat -
lat -
lat -
lat -
guestb tcp_crr --nolog -P 10001 -C 10011 -6
sleep 1
nsout LAT tcp_crr --nolog -P 10001 -C 10011 -6 -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 500 350
tr TCP throughput over IPv4: host to guest
iperf3s guest 100${i}1 __THREADS__
bw -
bw -
bw -
bw -
bw -
iperf3 BW ns 127.0.0.1 100${i}1 __THREADS__ __TIME__ __OPTS__
bw __BW__ 6.0 6.8
iperf3k guest
tl TCP RR latency over IPv4: host to guest
lat -
lat -
lat -
lat -
lat -
guestb tcp_rr --nolog -P 10001 -C 10011 -4
sleep 1
nsout LAT tcp_rr --nolog -P 10001 -C 10011 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 200 150
tl TCP CRR latency over IPv6: host to guest
lat -
lat -
lat -
lat -
lat -
guestb tcp_crr --nolog -P 10001 -C 10011 -4
sleep 1
nsout LAT tcp_crr --nolog -P 10001 -C 10011 -4 -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 500 300
te
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