_Performance Testing issues_

Branch: dpdk

f13604fad12a81383da7b04821a4befb3d01e2ed --> performance testing fail

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: 1/4

Detail performance results: 
+----------+-------------+---------+------------+------------------------------+
| num_cpus | num_threads | txd/rxd | frame_size |  throughput difference from  |
|          |             |         |            |           expected           |
+==========+=============+=========+============+==============================+
| 1        | 2           | 512     | 64         | -0.7%                        |
+----------+-------------+---------+------------+------------------------------+
| 1        | 2           | 2048    | 64         | 2.6%                         |
+----------+-------------+---------+------------+------------------------------+
| 1        | 1           | 512     | 64         | -1.4%                        |
+----------+-------------+---------+------------+------------------------------+
| 1        | 1           | 2048    | 64         | -5.9%                        |
+----------+-------------+---------+------------+------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/21713/

UNH-IOL DPDK Community Lab

To manage your email subscriptions, visit: 
https://lab.dpdk.org/results/dashboard/preferences/subscriptions/