Applications running within OpenStack instances that are sensitive to network performance can see improved performance by implementing OvS with DPDK.

Using OvS with DPDK (OvS-DPDK) provides a huge increase in network packet throughput and much lower latencies.

Background and reading:https://software.intel.com/en-us/articles/using-open-vswitch-with-dpdk-for-inter-vm-nfv-applications

To use VFIO (virtual function I/O), both the kernel and BIOS must support and be configured to use I/O virtualization. By enabling Intel® VT-d and loading the VFIO-PCI driver, I/O performance for the VMs will improve. For the data access by the VMs will bypass the hypervisor:

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