Back2Back: update default params

Update the default duration of a back to back test to be 2 seconds which
is the minimum recommended by RFC2544, and update the Trials to be 50,
which is also the default value specified by the RFC. This patch also
fixes the tcl script to allow for the minimum framesize to be sent from
the traffic gen.

JIRA:

Change-Id: I801196c1998ec2bffbeab69a3a290d6ef6feb1c3
Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Billy O Mahony <billy.o.mahony@intel.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/docs/test_spec/vswitchperf_ltd.rst b/docs/test_spec/vswitchperf_ltd.rst
index a2c72a8a..7adc864f 100755..100644
--- a/docs/test_spec/vswitchperf_ltd.rst
+++ b/docs/test_spec/vswitchperf_ltd.rst
@@ -1268,7 +1268,9 @@ Test ID: LTD.Throughput.RFC2544.BackToBackFrames
     If the number of received frames equals the number of frames that were
     transmitted, the burst size should be increased and traffic is sent to
     the DUT again. The value measured is the back-to-back value, that is the
-    maximum burst size the DUT can handle without any frame loss.
+    maximum burst size the DUT can handle without any frame loss. Please note
+    a trial must run for a minimum of 2 seconds and should be repeated 50
+    times (at a minimum).
 
     **Expected Result**:
 
@@ -1280,9 +1282,9 @@ Test ID: LTD.Throughput.RFC2544.BackToBackFrames
 
     The following are the metrics collected for this test:
 
-    -  The back-to-back value, which is the the number of frames in the
-       longest burst that the DUT will handle without the loss of any
-       frames.
+    -  The average back-to-back value across the trials, which is
+       the number of frames in the longest burst that the DUT will
+       handle without the loss of any frames.
     -  CPU and memory utilization may also be collected as part of this
        test, to determine the vSwitch's performance footprint on the system.