Deploying with OVS DPDK Support¶
TripleO can deploy Overcloud nodes with OVS DPDK support. A new role
ComputeOvsDpdk has been added to create a custom
composable OVS DPDK role.
Execute below command to create the
openstack overcloud roles generate -o roles_data.yaml Controller ComputeOvsDpdk
Once a roles file is created, the following changes are required:
Deploy command should include the generated roles data file from the above command.
Deploy command should also include the OVS DPDK environment file to override the default neutron-ovs-agent service with neutron-ovs-dpdk-agent service. All the required parameters are specified in this environment file as commented. The parameters has to be configured according to the baremetal on which OVS DPDK is enabled.
Also, OVS-DPDK requires mandatory kernel parameters to be set before
configuring the DPDK driver, like
intel_iommu=on on Intel machines. In
order to enable the configuration of kernel parameters to the host, host-
config-pre-network environment file has to be added for the deploy command.
Adding the following arguments to the
openstack overcloud deploy command
will do the trick:
openstack overcloud deploy --templates \ -r roles_data.yaml \ -e /usr/share/openstack-tripleo-heat-templates/environments/services/neutron-ovs-dpdk.yaml \ ...
Following are the list of parameters which need to be provided for deploying with OVS DPDK support.
OvsPmdCoreList: List of Logical CPUs to be allocated for Poll Mode Driver
OvsDpdkCoreList: List of Logical CPUs to be allocated for the openvswitch host process (lcore list)
OvsDpdkMemoryChannels: Number of memory channels
OvsDpdkSocketMemory: Socket memory list per NUMA node
parameter_defaults: OvsPmdCoreList: "2,3,18,19" OvsDpdkCoreList: "0,1,16,17" OvsDpdkMemoryChannels: "4" OvsDpdkSocketMemory: "1024,1024"
KernelArgs should be provided in the deployment environment
file, with the set of kernel boot parameters to be applied on the
ComputeOvsDpdk role where OVS DPDK is enabled:
parameter_defaults: ComputeOvsDpdkParameters: KernelArgs: "default_hugepagesz=1GB hugepagesz=1G hugepages=64 intel_iommu=on iommu=pt"
DPDK supported network interfaces should be specified in the network config templates to configure OVS DPDK on the node. The following new network config types have been added to support DPDK.
network_config: - type: ovs_user_bridge name: br-link use_dhcp: false members: - type: ovs_dpdk_port name: dpdk0 mtu: 2000 rx_queu: 2 members: - type: interface name: nic3