Brief overview of OVS-DPDK installation and packet transfer between a virtual and real host.
Specifications of the Equipment used:
1)Lenovo T460 Thinkpad, 4GB RAM 2)OS=Ubuntu 14.04 3)Kernel Version=3.19.0-25-generic(can be checked with the command uname -r) 4)eglibc 2.19(can be checked with ldd --version) 5)The NIC used for this purpose is I219 Intel e1000e.
OVS with DPDK and creation of an OVS bridge for communication between virtual and real host:
export DPDK_DIR=/home/test/Downloads/dpdk-17.05 export OVS_DIR=/home/test/Downloads/ovs
pkill ovs pkill ovsdb-server rm -rf /usr/local/var/run/openvswitch rm -rf /usr/local/etc/openvswitch/ rm -f /usr/local/etc/openvswitch/conf.db mkdir -p /usr/local/etc/openvswitch mkdir -p /usr/local/var/run/openvswitch $OVS_DIR/ovsdb/ovsdb-tool create /usr/local/etc/openvswitch/conf.db ./vswitchd/vswitch.ovsschema $OVS_DIR/ovsdb/ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock --remote=db:Open_vSwitch,Open_vSwitch,manager_options --pidfile --detach
modprobe kvm-intel
sleep 1
echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages mount -t hugetlbfs hugetlbfs /mnt/huge mount -t hugetlbfs none /mnt/huge_2mb -o pagesize=2MB modprobe uio insmod $DPDK_DIR/build/kmod/igb_uio.ko dpdk-devbind --bind=igb_uio eth0
modprobe openvswitch
export OVS_DIR=/home/test/Downloads/ovs cd $OVS_DIR
./vswitchd/ovs-vswitchd --detach echo $OVS_DIR
$OVS_DIR/utilities/ovs-vsctl emer-reset
$OVS_DIR/utilities/ovs-vsctl --no-wait init echo 'init done' $OVS_DIR/utilities/ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-lcore-mask=0xf echo 'Open_vSwitch done' $OVS_DIR/utilities/ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-socket-mem=1024 ./utilities/ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-socket-mem=1024 $OVS_DIR/utilities/ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true echo 'Open_vSwitch Config done'
ifconfig br0 down sleep 1 $OVS_DIR/utilities/ovs-vsctl --no-wait del-br br0
$OVS_DIR/utilities/ovs-vsctl --no-wait add-br br0 -- set bridge br0 datapath_type=netdev echo 'br0 Created' $OVS_DIR/utilities/ovs-vsctl --no-wait add-port br0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuser $OVS_DIR/utilities/ovs-vsctl --no-wait add-port br0 vhost-user2 -- set Interface vhost-user2 type=dpdkvhostuser $OVS_DIR/utilities/ovs-vsctl show
Creation of KVM:
ovs-vsctl add-port br0 wlan0 ifconfig wlan0 0 ifconfig br0 10.32.240.6 netmask 255.255.255.0 route add default gw 10.32.240.1 br0 ovs-vsctl del-port br0 tap0 kvm -m 512 -net nic,macaddr=00:00:00:00:cc:10 -net tap,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown cirros-0.3.5-x86_64-disk.img
Here we download the image of the kvm as cirros-0.3.5-x86_64-disk.img and allocate a RAM of 512 MB for the virtual host.
Pinging the real host for packets:
1)Log in to the virtual host 2)sudo ifconfig eth0 10.32.240.7/24 3)ping 10.32.240.6
Result:
We see a substantial increase in packet ping rate from about 8ms to 0.4ms. This is done with OVS with DPDK enabled.
If the same thing is repeated with: $OVS_DIR/utilities/ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=false
then,
then DPDK would be disabled and if we check we get the pinging rate as about 2-3ms.
Hence we conclude that OVS-DPDK together results in a substantial increase in packet ping rate than normal ping to a gateway or with just OVS with DPDK disabled.