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Configuring the VM Environment

Operations for configuring the VM environment on host 1 and host 2 are similar. Perform the following steps on all VMs. Exceptions will be specified.

  1. Modify the VM configuration file.

    For details, see step 7 in Running and Verifying XPF in the OVS Flow Table Normalization Feature Guide.

  2. Configure the network.
    Run the following command on both host 1 and host 2: 
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    sh topology_all.sh setvxlan
  3. Verify the networking.
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    ovs-vsctl show

    If no error is reported, the networking is successful.

  4. Assign an IP address to a VM.
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    ifconfig eth0 <VM IP address> up

    Example environment configuration:

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    Host 1:
VM1 192.168.1.11/24
VM2 192.168.1.12/24
VM3 192.168.1.13/24
VM4 192.168.1.14/24
VM5 192.168.1.15/24
VM6 192.168.1.16/24
VM7 192.168.1.17/24
VM8 192.168.1.18/24
Host 2:
VM1 192.168.1.21/24
VM2 192.168.1.22/24
VM3 192.168.1.23/24
VM4 192.168.1.24/24
VM5 192.168.1.25/24
VM6 192.168.1.26/24
VM7 192.168.1.27/24
VM8 192.168.1.28/24

    In the VXLAN networking, the default MTU of the host and VM is 1500. If a VM service data packet exceeds 1450 bytes, it exceeds 1500 bytes after being forwarded by OVS and added with the VXLAN header. The data packet is sent through a physical NIC (OVS+DPDK) which does not fragment the data packet. Thus VM service traffic cannot be forwarded. This is a known issue of the open source solution. Currently, you can set the MTU of the VM to a value less than 1450. In the example environment, the MTU of all VMs is set to 1450.

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    ifconfig eth0 mtu 1450
  5. Disable the VM firewall and SELinux.
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    systemctl stop firewalld.service && systemctl disable firewalld.service
setenforce 0

    This operation temporarily disables SELinux. To permanently disable the SELinux, edit the /etc/selinux/config configuration file and set SELINUX=disabled.

  6. Enable communication between the hosts and a VM.
    1. On the host, configure an IP address that is in the same network segment as the VM for the br-int bridge of the OVS. 
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      ifconfig br-int 192.168.1.254/24 up
    2. Verify the communication. 
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      ping <IP address of any VM>

      After confirming that the communication is normal, use tools such as FTP and SCP to transfer resources to the VM over the network.

  7. Install the test tool on a VM.
    1. Download vnStat-2.6 and Netperf-2.7.0 on the host.

      vnStat: https://github.com/vergoh/vnstat/archive/refs/tags/v2.6.zip

      Netperf: https://github.com/HewlettPackard/netperf/archive/refs/tags/netperf-2.7.0.zip

    2. Transfer vnStat of the host to the VM: 
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      scp vnstat-2.6.zip root@192.168.3.2:/home

      Enter the password of the root user of the VM to transfer vnStat to the /home directory of the VM.

    3. Use the same method to transfer Netperf to the VM.
    4. Decompress the vnStat and Netperf packages and perform compilation. 
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      cd /home
unzip vnstat-2.6.zip && cd vnstat-2.6
./configure && make && make install
cd /home
unzip netperf-netperf-2.7.0.zip && cd netperf-netperf-2.7.0
./configure && make && make install

      Before the compilation, ensure that the VM has a built-in compiler.

  8. Prepare the VM test script.
    1. Prepare the VM script of host 2. All VMs use the same script. (In the example VM, the script is named run.sh.) 
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      pkill netserver
taskset -c  0 netserver -4 -p 21101
taskset -c  1 netserver -4 -p 21102
taskset -c  2 netserver -4 -p 21103
taskset -c  3 netserver -4 -p 21104
taskset -c  0 netserver -4 -p 25101
taskset -c  1 netserver -4 -p 25102
taskset -c  2 netserver -4 -p 25103
taskset -c  3 netserver -4 -p 25104
    1. Prepare the VM script of host 1 for different scenarios.
      • Script for testing the software offloading packet rate (In the example environment, the script is named run_8VM.sh.)

        VM 1:

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        pkill netperf
taskset -c 0 netperf -t UDP_STREAM -H 192.168.1.21  -p 21101 -l 10000 -- -m 18 &
taskset -c 1 netperf -t UDP_STREAM -H 192.168.1.22  -p 21101 -l 10000 -- -m 18 &
taskset -c 2 netperf -t UDP_STREAM -H 192.168.1.23  -p 21101 -l 10000 -- -m 18 &
taskset -c 3 netperf -t UDP_STREAM -H 192.168.1.24  -p 21101 -l 10000 -- -m 18 &
taskset -c 0 netperf -t UDP_STREAM -H 192.168.1.25  -p 21101 -l 10000 -- -m 18 &
taskset -c 1 netperf -t UDP_STREAM -H 192.168.1.26  -p 21101 -l 10000 -- -m 18 &
taskset -c 2 netperf -t UDP_STREAM -H 192.168.1.27  -p 21101 -l 10000 -- -m 18 &
taskset -c 3 netperf -t UDP_STREAM -H 192.168.1.28  -p 21101 -l 10000 -- -m 18 &

        VM 2: The configuration is similar to that of VM 1. Simply change ports in the script to 21102.

        VM 3: Simply change ports in the script to 21103.

        VM 4: Simply change ports in the script to 21104.

        VM 5: Simply change ports in the script to 25101.

        VM 6: Simply change ports in the script to 25102.

        VM 7: Simply change ports in the script to 25103.

        VM 8: Simply change ports in the script to 25104.

        • taskset -c 0 indicates CPU affinity.
        • -t UDP_STREAM indicates that UDP is used to send streams.
        • -H 192.168.1.21 specifies the peer IP address.
        • -p 21101 specifies the port.
        • -l 10000 specifies the duration in seconds.
        • -m 1 specifies the packet length in bytes. If the packet length is less than 64 bytes, 64 bytes are automatically filled in.
      • Script for testing the software offloading bandwidth. (In the example environment, the script is named bw_8VM.sh.)

        VM 1:

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        pkill netperf
taskset -c 0 netperf -t TCP_STREAM -H 192.168.1.21  -p 21101 -l 10000 &
taskset -c 1 netperf -t TCP_STREAM -H 192.168.1.22  -p 21101 -l 10000 &
taskset -c 2 netperf -t TCP_STREAM -H 192.168.1.23  -p 21101 -l 10000 &
taskset -c 3 netperf -t TCP_STREAM -H 192.168.1.24  -p 21101 -l 10000 &
taskset -c 0 netperf -t TCP_STREAM -H 192.168.1.25  -p 21101 -l 10000 &
taskset -c 1 netperf -t TCP_STREAM -H 192.168.1.26  -p 21101 -l 10000 &
taskset -c 2 netperf -t TCP_STREAM -H 192.168.1.27  -p 21101 -l 10000 &
taskset -c 3 netperf -t TCP_STREAM -H 192.168.1.28  -p 21101 -l 10000 &

        VM 2: The configuration is similar to that of VM 1. Simply change ports in the script to 21102.

        VM 3: Simply change ports in the script to 21103.

        VM 4: Simply change ports in the script to 21104.

        VM 5: Simply change ports in the script to 25101.

        VM 6: Simply change ports in the script to 25102.

        VM 7: Simply change ports in the script to 25103.

        VM 8: Simply change ports in the script to 25104.

      • Open-source packet rate test script (In the example environment, the script is named run_3_4VM.sh.)

        VM 1:

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        pkill netperf
taskset -c  0 netperf -t UDP_STREAM -H 192.168.1.21 -p 21101 -l 10000 -- -m 1 &
taskset -c  1 netperf -t UDP_STREAM -H 192.168.1.21 -p 21102 -l 10000 -- -m 1 &
taskset -c  2 netperf -t UDP_STREAM -H 192.168.1.21 -p 25103 -l 10000 -- -m 1 &
taskset -c  3 netperf -t UDP_STREAM -H 192.168.1.21 -p 25104 -l 10000 -- -m 1 &

        VM 2: The configuration is similar to that of VM 1. Simply change the IP address to 192.168.1.22.

        VM 3: Simply change the IP address to 192.168.1.23.

        VM 4: Simply change the IP address to 192.168.1.24.

        VM 5: Simply change the IP address to 192.168.1.25.

        VM 6: Simply change the IP address to 192.168.1.26.

        VM 7: Simply change the IP address to 192.168.1.27.

        VM 8: Simply change the IP address to 192.168.1.28.

      • Open-source bandwidth test script (In the example environment, the script is named bw_3_4VM.sh.)

        VM 1:

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        pkill netperf
taskset -c  0 netperf -t TCP_STREAM -H 192.168.1.21 -p 21101 -l 10000 &
taskset -c  1 netperf -t TCP_STREAM -H 192.168.1.21 -p 21102 -l 10000 &
taskset -c  2 netperf -t TCP_STREAM -H 192.168.1.21 -p 25103 -l 10000 &
taskset -c  3 netperf -t TCP_STREAM -H 192.168.1.21 -p 25104 -l 10000 &

        VM 2: The configuration is similar to that of VM 1. Simply change the IP address to 192.168.1.22.

        VM 3: Simply change the IP address to 192.168.1.23.

        VM 4: Simply change the IP address to 192.168.1.24.

        VM 5: Simply change the IP address to 192.168.1.25.

        VM 6: Simply change the IP address to 192.168.1.26.

        VM 7: Simply change the IP address to 192.168.1.27.

        VM 8: Simply change the IP address to 192.168.1.28.