_Performance Testing PASS_

Branch: dpdk-next-virtio

64404b70f93e3317a2787af74ee89ed5c0c8a43b --> performance testing pass

Test environment and result as below:

Ubuntu 20.04
Kernel: 4.15.0-generic
Compiler: gcc 7.4
NIC: Intel Corporation Ethernet Converged Network Adapter XL710-QDA2 40000 Mbps
Target: x86_64-native-linuxapp-gcc
Fail/Total: 0/4

Detail performance results: 
+------------+---------+----------+-------------+------------------------------+
| frame_size | txd/rxd | num_cpus | num_threads |  throughput difference from  |
|            |         |          |             |           expected           |
+============+=========+==========+=============+==============================+
| 64         | 512     | 1        | 1           | -0.2%                        |
+------------+---------+----------+-------------+------------------------------+
| 64         | 2048    | 1        | 1           | 0.9%                         |
+------------+---------+----------+-------------+------------------------------+
| 64         | 512     | 1        | 2           | -2.6%                        |
+------------+---------+----------+-------------+------------------------------+
| 64         | 2048    | 1        | 2           | 0.6%                         |
+------------+---------+----------+-------------+------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/17632/

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