[DPDK/DTS Bug 1969] dts: fix variance in single core forward performance test

[DPDK/DTS Bug 1969] dts: fix variance in single core forward performance test

[bugzilla]

http://bugs.dpdk.org/show_bug.cgi?id=1969

            Bug ID: 1969
           Summary: dts: fix variance in single core forward performance
                    test
           Product: DPDK
           Version: 26.07
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: DTS
          Assignee: dev@dpdk.org
          Reporter: abailey@iol.unh.edu
                CC: juraj.linkes@pantheon.tech, probb@iol.unh.edu
  Target Milestone: ---

Currently, multiple performance runs yield varying results with a standard
deviation of about 10Mpps. This is on the same testbed that has consistent
performance results when running old DTS with a standard deviation of about
1Mpps. There was a commit sent to old DTS specifically addressing this variance
issue by limiting the transmission duration to 5 seconds and averaging results
over a couple of runs instead of one. Testing this 5 second gap instead of 30
has shown consistent results when testing new DTS locally, however, averaging
over a few runs may be beneficial to implement as well with new DTS.

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