CSIT-102: Add latency measurement to performance testing

- Add latency stream as a background stream in both directions
- Latency background stream is not using the VM transformation engine.
  Raw stream with single packet is created.
- Latency background stream has 1kpps rate with packet of same size as
  traffic stream.
- Display latency values (min/avg/max) in results of TC and reporting
  remaining data including histogram and jitter inside of the
  search/pass keyword.

Change-Id: I78ce4659b57caab08d5729f51a1e14d518fd3273
Signed-off-by: Peter Mikus <pmikus@cisco.com>
Signed-off-by: pmikus <pmikus@cisco.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/resources/libraries/python/DropRateSearch.py b/resources/libraries/python/DropRateSearch.py
index 1f8e5618fe..b0f15b25db 100644
--- a/resources/libraries/python/DropRateSearch.py
+++ b/resources/libraries/python/DropRateSearch.py
@@ -453,14 +453,14 @@ class DropRateSearch(object):
     def verify_search_result(self):
         """Fail if search was not successful.
 
-        :return: Result rate.
-        :rtype: float
+        :return: Result rate and latency stats.
+        :rtype: tuple
         """
         if self._search_result == SearchResults.FAILURE:
             raise Exception('Search FAILED')
         elif self._search_result in [SearchResults.SUCCESS,
                                      SearchResults.SUSPICIOUS]:
-            return self._search_result_rate
+            return self._search_result_rate, self._latency_stats
 
     def binary_search(self, b_min, b_max, traffic_type, skip_max_rate=False):
         """Binary search of rate with loss below acceptance criteria.