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# SPDX-License-Identifier: AGPL-3.0-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/demo/passt - Quick introduction to passt
#
# Copyright (c) 2021 Red Hat GmbH
# Author: Stefano Brivio <sbrivio@redhat.com>
onlyfor passt
say This is a short introduction to
em passt
say .
nl
nl
sleep 3
say Let's fetch the source
sleep 1
tempdir TEMPDIR
host cd __TEMPDIR__
host git clone https://passt.top/passt
sleep 1
say and build it.
sleep 1
host cd passt
host make avx2
sleep 1
nl
nl
say A quick look at the man page...
sleep 1
hostb man ./passt.1
sleep 5
hostb /ports
sleep 2
hostb n
sleep 2
hostb n
sleep 10
nl
say '-t' to forward TCP ports.
sleep 3
host q
nl
nl
say Let's create a small initramfs image for the guest.
guest cd __TEMPDIR__
guest git clone https://mbuto.lameexcu.se/mbuto
guest cd mbuto
guest ./mbuto -f passt.img -p passt -c lz4
sleep 2
nl
nl
say We want to isolate passt and guest in a
nl
say network namespace. For convenience, we'll
nl
say create it with 'pasta', see also the
nl
say 'pasta' demo above.
sleep 3
passt cd __TEMPDIR__/passt
passtb ./pasta
sleep 3
passt /sbin/dhclient
sleep 2
passt /sbin/dhclient -6
sleep 2
nl
nl
say Now let's run 'passt' in the new namespace, and
nl
say enter this namespace from the guest terminal too.
sleep 3
pout TARGET_PID echo $$
sleep 1
passtb ./passt -f -t 5201,5203
sleep 2
guest nsenter -t __TARGET_PID__ -U -n --preserve-credentials
sleep 5
nl
nl
say We're ready to start qemu with the qrap wrapper,
nl
say that we currently need to connect the netdev
nl
say back-end to passt's UNIX domain socket.
sleep 2
hout VMLINUZ echo "/boot/vmlinuz-$(uname -r)"
guest ../passt/qrap 5 kvm -m 4096 -cpu host -smp 4 -kernel __VMLINUZ__ -initrd passt.img -nographic -serial stdio -nodefaults -append "console=ttyS0 virtio-net.napi_tx=1" -device virtio-net-pci,netdev=hostnet0,x-txburst=16384 -netdev socket,fd=5,id=hostnet0
sleep 10
nl
nl
guest ip li sh
sleep 3
say Guest is up. Let's configure IPv4 first...
sleep 2
guest dhclient
sleep 2
guest ip ad sh
sleep 5
nl
say SLAAC is already done, but we can also
nl
say get another address via DHCPv6.
sleep 3
guest dhclient -6
sleep 3
nl
nl
say Let's try to communicate between host and guest.
sleep 2
guestb nc -6 -l -p 5201
sleep 2
host echo "Hello from the host" | nc -N ::1 5201
sleep 5
nl
nl
say Now the other way around... using
nl
say the address of the default gateway.
sleep 2
gout GW ip -j -4 ro sh|jq -rM '.[] | select(.dst == "default").gateway'
sleep 5
hostb nc -l -p 31337
sleep 2
guest echo "Hello from the guest" | nc -N __GW__ 31337
sleep 3
nl
nl
say Let's have a (quick!) look at performance
nl
say more in the "Performance" section below.
sleep 3
host nsenter -t __TARGET_PID__ -U -n --preserve-credentials
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
host sysctl -w net.ipv4.tcp_rmem="4096 524288 134217728"
host sysctl -w net.ipv4.tcp_wmem="4096 524288 134217728"
host sysctl -w net.ipv4.tcp_timestamps=0
gout GW6 ip -j -6 ro sh|jq -rM '.[] | select(.dst == "default").gateway'
gout IFNAME ip -j li sh | jq -rM '.[] | select(.link_type == "ether").ifname'
nl
nl
info Throughput in Gbps, latency in µs
th flow host>guest guest>host
set OPTS -P4 -w 64M -l 1M -i1 --pacing-timer 100000
tr TCP/IPv6 throughput
hostb sleep 10; iperf3 -c ::1 __OPTS__
gout BW iperf3 -s1J | jq -rM ".end.sum_received.bits_per_second"
bw __BW__ 2.0 3.0
sleep 5
guestb sleep 10; iperf3 -c __GW6__%__IFNAME__ -p 5202 __OPTS__ -O3
hout BW iperf3 -s1J -p 5202 | jq -rM ".end.sum_received.bits_per_second"
bw __BW__ 2.0 3.0
tl TCP/IPv6 RR latency
guestb tcp_rr -C 5201 -P 5203 -6 --nolog
sleep 2
hout LAT tcp_rr -C 5201 -P 5203 --nolog -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 1000 800
sleep 2
hostb tcp_rr -6 --nolog
sleep 2
gout LAT tcp_rr --nolog -c -H __GW6__%__IFNAME__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 1000 800
sleep 2
tl TCP/IPv6 CRR latency
guestb tcp_crr -C 5201 -P 5203 -6 --nolog
sleep 2
hout LAT tcp_crr -C 5201 -P 5203 --nolog -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 1000 800
sleep 2
hostb tcp_crr -6 --nolog
sleep 2
gout LAT tcp_crr --nolog -c -H __GW6__%__IFNAME__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 1000 800
sleep 2
tr TCP/IPv4 throughput
hostb sleep 10; iperf3 -c 127.0.0.1 __OPTS__
gout BW iperf3 -s1J | jq -rM ".end.sum_received.bits_per_second"
bw __BW__ 2.0 3.0
sleep 5
guestb sleep 10; iperf3 -c __GW__ -p 5202 __OPTS__ -O3
hout BW iperf3 -s1J -p 5202 | jq -rM ".end.sum_received.bits_per_second"
bw __BW__ 2.0 3.0
tl TCP/IPv4 RR latency
guestb tcp_rr -C 5201 -P 5203 -4 --nolog
sleep 2
hout LAT tcp_rr -C 5201 -P 5203 --nolog -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 1000 800
sleep 2
hostb tcp_rr -4 --nolog
sleep 2
gout LAT tcp_rr --nolog -c -H __GW__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 1000 800
sleep 2
tl TCP/IPv4 CRR latency
guestb tcp_crr -C 5201 -P 5203 -4 --nolog
sleep 2
hout LAT tcp_crr -C 5201 -P 5203 --nolog -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 1000 800
sleep 2
hostb tcp_crr -4 --nolog
sleep 2
gout LAT tcp_crr --nolog -c -H __GW__ | sed -n 's/^throughput=\(.*\)/\1/p'
lat __LAT__ 1000 800
sleep 2
nl
nl
say Thanks for watching!
sleep 5
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