[dts] [Bug 640] Modify the test nic_single_core_perf so that the accepted tolerance is a percentage

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=640

            Bug ID: 640
           Summary: Modify the test nic_single_core_perf so that the
                    accepted tolerance is a percentage
           Product: DTS
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: tests
          Assignee: dts at dpdk.org
          Reporter: alialnu at nvidia.com
  Target Milestone: ---

An iteration/case in the test nic_single_core_perf currently fails if the delta
(difference between real rx_pps and expected rx_pps) exceeds the absolute
number specified by 'accepted_tolerance' in conf/nic_single_core_perf.cfg.

The default 'accepted_tolerance' is set to 1 mpps, which is very large when the
expected is only a few million packets per second, specially for large frame
sizes.

Since test results are now reported to the mailing list in percentages, I
suggest updating the test so that the accepted tolerance is a percentage rather
than an absolute number.

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