mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-08-22 07:51:16 +00:00
Testing instructions are very old and type=dpdkvhostuser is deprecated from DPDK. logs from /var/log/openvswitch/ovs-vswitchd.log |netdev_dpdk|WARN|dpdkvhostuser ports are considered deprecated; please migrate to dpdkvhostuserclient ports Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@intel.com>
146 lines
5.9 KiB
Markdown
146 lines
5.9 KiB
Markdown
# How to test Vhost-user net with OpenVSwitch/DPDK
|
|
|
|
The purpose of this document is to illustrate how to test vhost-user-net
|
|
in cloud-hypervisor with OVS/DPDK as the backend. This document was
|
|
tested with Open vSwitch v2.17.8, DPDK v21.11.4, and Cloud Hypervisor
|
|
v37.0 on Ubuntu 22.04.3 (host kernel v5.15.0).
|
|
|
|
## Framework
|
|
|
|
It's a simple test to validate the communication between two virtual machine, connecting them to vhost-user ports respectively provided by `OVS/DPDK`.
|
|
```
|
|
+----+----------+ +-------------+-----------+-------------+ +----------+----+
|
|
| | | | | | | | | |
|
|
| |vhost-user|----------| vhost-user | ovs | vhost-user |----------|vhost-user| |
|
|
| |net device| | port 1 | | port 2 | |net device| |
|
|
| | | | | | | | | |
|
|
| +----------+ +-------------+-----------+-------------+ +----------+ |
|
|
| | | | | |
|
|
|vm1 | | dpdk | | vm2 |
|
|
| | | | | |
|
|
+--+---------------------------------------------------------------------------------------------+--+
|
|
| | hugepages | |
|
|
| +---------------------------------------------------------------------------------------------+ |
|
|
| |
|
|
| host |
|
|
| |
|
|
+---------------------------------------------------------------------------------------------------+
|
|
```
|
|
## Prerequisites
|
|
|
|
Prior to running the test, the following steps need to be performed.
|
|
- Enable hugepages
|
|
- Install DPDK
|
|
- Install OVS
|
|
|
|
Here is a good reference for setting up OVS with DPDK from scratch:
|
|
https://docs.openvswitch.org/en/latest/intro/install/dpdk/.
|
|
|
|
On Ubuntu systems (18.04 or newer), the OpenVswitch-DPDK package can be
|
|
easily installed with:
|
|
```bash
|
|
sudo apt-get update
|
|
sudo apt-get install openvswitch-switch-dpdk
|
|
sudo update-alternatives --set ovs-vswitchd /usr/lib/openvswitch-switch-dpdk/ovs-vswitchd-dpdk
|
|
```
|
|
## Test
|
|
The test runs with multiple queue (MQ) support enabled, using 2 pairs of
|
|
TX/RX queues defined for both OVS and the virtual machine. Here are the
|
|
detailed instructions.
|
|
|
|
_Setup OVS_
|
|
|
|
Here is an example how to configure a basic OpenVswitch using DPDK:
|
|
```bash
|
|
# load the ovs kernel module
|
|
modprobe openvswitch
|
|
sudo service openvswitch-switch start
|
|
ovs-vsctl init
|
|
ovs-vsctl set Open_vSwitch . other_config:dpdk-init=true
|
|
# run on core 0-3 only
|
|
ovs-vsctl set Open_vSwitch . other_config:dpdk-lcore-mask=0xf
|
|
# allocate 2G huge pages (to NUMA 0 only)
|
|
ovs-vsctl set Open_vSwitch . other_config:dpdk-socket-mem=1024
|
|
# run PMD (Pull Mode Driver) threads on core 0-3 only
|
|
ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=0xf
|
|
sudo service openvswitch-switch restart
|
|
# double check the configurations
|
|
ovs-vsctl list Open_vSwitch
|
|
```
|
|
|
|
Here is an example how to create a bridge and add two DPDK ports to it
|
|
(for later use via Cloud Hypervisor):
|
|
```bash
|
|
# create a bridge
|
|
ovs-vsctl add-br ovsbr0 -- set bridge ovsbr0 datapath_type=netdev
|
|
# create two DPDK ports and add them to the bridge
|
|
ovs-vsctl add-port ovsbr0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuserclient options:vhost-server-path=/tmp/vhost-user1
|
|
ovs-vsctl add-port ovsbr0 vhost-user2 -- set Interface vhost-user2 type=dpdkvhostuserclient options:vhost-server-path=/tmp/vhost-user2
|
|
# set the number of rx queues
|
|
ovs-vsctl set Interface vhost-user1 options:n_rxq=2
|
|
ovs-vsctl set Interface vhost-user2 options:n_rxq=2
|
|
```
|
|
|
|
_Launch the VMs_
|
|
|
|
VMs run in client mode. They connect to the socket created by the `dpdkvhostuser` backend.
|
|
```bash
|
|
# From one terminal. We need to give the cloud-hypervisor binary the NET_ADMIN capabilities for it to set TAP interfaces up on the host.
|
|
./cloud-hypervisor \
|
|
--cpus boot=2 \
|
|
--memory size=512M,hugepages=on,shared=true \
|
|
--kernel vmlinux \
|
|
--cmdline "console=ttyS0 console=hvc0 root=/dev/vda1 rw" \
|
|
--disk path=focal-server-cloudimg-amd64.raw \
|
|
--net mac=52:54:00:02:d9:01,vhost_user=true,socket=/tmp/vhost-user1,num_queues=4,vhost_mode=server
|
|
|
|
# From another terminal. We need to give the cloud-hypervisor binary the NET_ADMIN capabilities for it to set TAP interfaces up on the host.
|
|
./cloud-hypervisor \
|
|
--cpus boot=2 \
|
|
--memory size=512M,hugepages=on,shared=true \
|
|
--kernel vmlinux \
|
|
--cmdline "console=ttyS0 console=hvc0 root=/dev/vda1 rw" \
|
|
--disk path=focal-server-cloudimg-amd64.raw \
|
|
--net mac=52:54:20:11:C5:02,vhost_user=true,socket=/tmp/vhost-user2,num_queues=4,vhost_mode=server
|
|
```
|
|
|
|
_Setup VM1_
|
|
```bash
|
|
# From inside the guest
|
|
sudo ip addr add 172.100.0.1/24 dev ens3
|
|
sudo ip link set up dev ens3
|
|
```
|
|
|
|
_Setup VM2_
|
|
```bash
|
|
# From inside the guest
|
|
sudo ip addr add 172.100.0.2/24 dev ens3
|
|
sudo ip link set up dev ens3
|
|
```
|
|
|
|
_Ping VM1 from VM2_
|
|
```bash
|
|
# From inside the guest
|
|
sudo ping 172.100.0.1
|
|
```
|
|
|
|
_Ping VM2 from VM1_
|
|
```bash
|
|
# From inside the guest
|
|
sudo ping 172.100.0.2
|
|
```
|
|
|
|
__Result:__ At this point, VM1 and VM2 can ping each other successfully. We can now run `iperf3` test.
|
|
|
|
_Run VM1 as server_
|
|
```bash
|
|
# From inside the guest
|
|
iperf3 -s -p 4444
|
|
```
|
|
|
|
_Run VM2 as client_
|
|
```bash
|
|
# From inside the guest
|
|
iperf3 -c 172.100.0.1 -t 30 -p 4444 &
|
|
```
|