248 lines
5.6 KiB
Text
248 lines
5.6 KiB
Text
# SPDX-License-Identifier: AGPL-3.0-or-later
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#
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# PASST - Plug A Simple Socket Transport
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# for qemu/UNIX domain socket mode
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#
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# PASTA - Pack A Subtle Tap Abstraction
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# for network namespace/tap device mode
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#
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# test/demo/passt - Quick introduction to passt
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#
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# Copyright (c) 2021 Red Hat GmbH
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# Author: Stefano Brivio <sbrivio@redhat.com>
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onlyfor passt
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say This is a short introduction to
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em passt
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say .
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nl
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nl
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sleep 3
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say Let's fetch the source
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sleep 1
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tempdir TEMPDIR
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host cd __TEMPDIR__
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host git clone https://passt.top/passt
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sleep 1
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say and build it.
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sleep 1
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host cd passt
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host make avx2
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sleep 1
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nl
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nl
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say A quick look at the man page...
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sleep 1
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hostb man ./passt.1
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sleep 5
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hostb /ports
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sleep 2
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hostb n
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sleep 2
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hostb n
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sleep 10
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nl
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say '-t' to forward TCP ports.
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sleep 3
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host q
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nl
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nl
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say Let's create a small initramfs image for the guest.
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guest cd __TEMPDIR__
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guest git clone https://mbuto.lameexcu.se/mbuto
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guest cd mbuto
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guest ./mbuto -f passt.img -p passt -c lz4
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sleep 2
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nl
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nl
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say We want to isolate passt and guest in a
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nl
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say network namespace. For convenience, we'll
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nl
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say create it with 'pasta', see also the
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nl
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say 'pasta' demo above.
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sleep 3
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passt cd __TEMPDIR__/passt
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passtb ./pasta
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sleep 3
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passt /sbin/dhclient
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sleep 2
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passt /sbin/dhclient -6
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sleep 2
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nl
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nl
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say Now let's run 'passt' in the new namespace, and
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nl
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say enter this namespace from the guest terminal too.
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sleep 3
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pout TARGET_PID echo $$
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sleep 1
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passtb ./passt -f -t 5201,5203
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sleep 2
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guest nsenter -t __TARGET_PID__ -U -n --preserve-credentials
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sleep 5
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nl
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nl
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say We're ready to start qemu with the qrap wrapper,
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nl
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say that we currently need to connect the netdev
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nl
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say back-end to passt's UNIX domain socket.
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sleep 2
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hout VMLINUZ echo "/boot/vmlinuz-$(uname -r)"
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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
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sleep 10
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nl
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nl
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guest ip li sh
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sleep 3
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say Guest is up. Let's configure IPv4 first...
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sleep 2
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guest dhclient
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sleep 2
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guest ip ad sh
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sleep 5
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nl
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say SLAAC is already done, but we can also
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nl
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say get another address via DHCPv6.
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sleep 3
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guest dhclient -6
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sleep 3
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nl
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nl
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say Let's try to communicate between host and guest.
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sleep 2
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guestb nc -6 -l -p 5201
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sleep 2
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host echo "Hello from the host" | nc -N ::1 5201
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sleep 5
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nl
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nl
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say Now the other way around... using
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nl
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say the address of the default gateway.
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sleep 2
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gout GW ip -j -4 ro sh|jq -rM '.[] | select(.dst == "default").gateway'
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sleep 5
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hostb nc -l -p 31337
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sleep 2
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guest echo "Hello from the guest" | nc -N __GW__ 31337
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sleep 3
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nl
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nl
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say Let's have a (quick!) look at performance
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nl
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say more in the "Performance" section below.
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sleep 3
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host nsenter -t __TARGET_PID__ -U -n --preserve-credentials
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guest /sbin/sysctl -w net.core.rmem_max=536870912
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guest /sbin/sysctl -w net.core.wmem_max=536870912
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guest /sbin/sysctl -w net.core.rmem_default=33554432
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guest /sbin/sysctl -w net.core.wmem_default=33554432
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guest /sbin/sysctl -w net.ipv4.tcp_rmem="4096 131072 268435456"
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guest /sbin/sysctl -w net.ipv4.tcp_wmem="4096 131072 268435456"
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guest /sbin/sysctl -w net.ipv4.tcp_timestamps=0
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host sysctl -w net.ipv4.tcp_rmem="4096 524288 134217728"
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host sysctl -w net.ipv4.tcp_wmem="4096 524288 134217728"
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host sysctl -w net.ipv4.tcp_timestamps=0
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gout GW6 ip -j -6 ro sh|jq -rM '.[] | select(.dst == "default").gateway'
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gout IFNAME ip -j li sh | jq -rM '.[] | select(.link_type == "ether").ifname'
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nl
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nl
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info Throughput in Gbps, latency in µs
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th flow host>guest guest>host
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set OPTS -P4 -w 64M -l 1M -i1 --pacing-timer 100000
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tr TCP/IPv6 throughput
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hostb sleep 10; iperf3 -c ::1 __OPTS__
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gout BW iperf3 -s1J | jq -rM ".end.sum_received.bits_per_second"
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bw __BW__ 2.0 3.0
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sleep 5
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guestb sleep 10; iperf3 -c __GW6__%__IFNAME__ -p 5202 __OPTS__ -O3
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hout BW iperf3 -s1J -p 5202 | jq -rM ".end.sum_received.bits_per_second"
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bw __BW__ 2.0 3.0
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tl TCP/IPv6 RR latency
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guestb tcp_rr -C 5201 -P 5203 -6 --nolog
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sleep 2
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hout LAT tcp_rr -C 5201 -P 5203 --nolog -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 800
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sleep 2
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hostb tcp_rr -6 --nolog
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sleep 2
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gout LAT tcp_rr --nolog -c -H __GW6__%__IFNAME__ | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 800
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sleep 2
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tl TCP/IPv6 CRR latency
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guestb tcp_crr -C 5201 -P 5203 -6 --nolog
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sleep 2
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hout LAT tcp_crr -C 5201 -P 5203 --nolog -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 800
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sleep 2
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hostb tcp_crr -6 --nolog
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sleep 2
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gout LAT tcp_crr --nolog -c -H __GW6__%__IFNAME__ | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 800
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sleep 2
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tr TCP/IPv4 throughput
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hostb sleep 10; iperf3 -c 127.0.0.1 __OPTS__
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gout BW iperf3 -s1J | jq -rM ".end.sum_received.bits_per_second"
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bw __BW__ 2.0 3.0
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sleep 5
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guestb sleep 10; iperf3 -c __GW__ -p 5202 __OPTS__ -O3
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hout BW iperf3 -s1J -p 5202 | jq -rM ".end.sum_received.bits_per_second"
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bw __BW__ 2.0 3.0
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tl TCP/IPv4 RR latency
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guestb tcp_rr -C 5201 -P 5203 -4 --nolog
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sleep 2
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hout LAT tcp_rr -C 5201 -P 5203 --nolog -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 800
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sleep 2
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hostb tcp_rr -4 --nolog
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sleep 2
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gout LAT tcp_rr --nolog -c -H __GW__ | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 800
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sleep 2
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tl TCP/IPv4 CRR latency
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guestb tcp_crr -C 5201 -P 5203 -4 --nolog
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sleep 2
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hout LAT tcp_crr -C 5201 -P 5203 --nolog -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 800
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sleep 2
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hostb tcp_crr -4 --nolog
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sleep 2
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gout LAT tcp_crr --nolog -c -H __GW__ | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 800
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sleep 2
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nl
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nl
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say Thanks for watching!
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sleep 5
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