_Performance Testing issues_

Branch: dpdk-next-crypto

7b1934d01a1a8afa1391f361088d8285d100e62a --> 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         | -0.5%                        |
+----------+-------------+---------+------------+------------------------------+
| 1        | 2           | 2048    | 64         | 0.9%                         |
+----------+-------------+---------+------------+------------------------------+
| 1        | 1           | 512     | 64         | 2.5%                         |
+----------+-------------+---------+------------+------------------------------+
| 1        | 1           | 2048    | 64         | -5.0%                        |
+----------+-------------+---------+------------+------------------------------+

To view detailed results, visit:
https://lab.dpdk.org/results/dashboard/tarballs/22531/

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