Random flows: Use seeds again and increase limit.

TRex does mix seeds when distributing over workers,
but it is multiplicative [0], so zero is the only bad value.

Limit restricts the cycle length of PRNG (by resetting [1] the seed).
We want the cycle as long as possible.

[0] https://github.com/cisco-system-traffic-generator/trex-core/blob/v2.73/src/stx/stl/trex_stl_stream_vm.h#L1616
[1] https://github.com/cisco-system-traffic-generator/trex-core/blob/v2.73/src/stx/stl/trex_stl_stream_vm.h#L313-L314

Change-Id: I33a29496f0853ef60d592c988f81a9d1109b5878
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

1 files changed, 20 insertions, 15 deletions

diff --git a/GPL/traffic_profiles/trex/trex-stl-ethip4-ip4dst-rnd10000.py b/GPL/traffic_profiles/trex/trex-stl-ethip4-ip4dst-rnd10000.py
index 3ecf1a47d8..ef2dcde696 100644
--- a/GPL/traffic_profiles/trex/trex-stl-ethip4-ip4dst-rnd10000.py
+++ b/GPL/traffic_profiles/trex/trex-stl-ethip4-ip4dst-rnd10000.py
@@ -42,7 +42,7 @@ class TrafficStreams(TrafficStreamsBaseClass):
     """Stream profile."""
 
     def __init__(self):
-        """Initialization and setting of streams" parameters."""
+        """Initialization and setting of streams' parameters."""
 
         super(TrafficStreamsBaseClass, self).__init__()
 
@@ -66,21 +66,21 @@ class TrafficStreams(TrafficStreamsBaseClass):
 
         # Direction 0 --> 1
         base_pkt_a = (
-                Ether() /
-                IP(
-                    src=self.p1_src_start_ip,
-                    dst=self.p1_dst_start_ip,
-                    proto=61
-                )
+            Ether() /
+            IP(
+                src=self.p1_src_start_ip,
+                dst=self.p1_dst_start_ip,
+                proto=61
+            )
         )
         # Direction 1 --> 0
         base_pkt_b = (
-                Ether() /
-                IP(
-                    src=self.p2_src_start_ip,
-                    dst=self.p2_dst_start_ip,
-                    proto=61
-                )
+            Ether() /
+            IP(
+                src=self.p2_src_start_ip,
+                dst=self.p2_dst_start_ip,
+                proto=61
+            )
         )
 
         # Direction 0 --> 1
@@ -91,7 +91,9 @@ class TrafficStreams(TrafficStreamsBaseClass):
                     min_value=self.p1_dst_start_ip,
                     max_value=self.p1_dst_end_ip,
                     size=4,
-                    limit=10000
+                    seed=1,
+                    # Cycle length. TRex does not allow any higher value.
+                    limit=(2**24 - 1)
                 ),
                 STLVmWrFlowVar(
                     fv_name=u"dst",
@@ -111,7 +113,10 @@ class TrafficStreams(TrafficStreamsBaseClass):
                     min_value=self.p2_dst_start_ip,
                     max_value=self.p2_dst_end_ip,
                     size=4,
-                    limit=10000
+                    # Using a different seed to be extra sure
+                    # nothing useful gets cached.
+                    seed=2,
+                    limit=(2**24 - 1)
                 ),
                 STLVmWrFlowVar(
                     fv_name=u"dst",