1 files changed, 18 insertions, 4 deletions
diff --git a/test/run.py b/test/run.py
index 58112fd790c..93391a7e9cc 100755
--- a/test/run.py
+++ b/test/run.py
@@ -26,6 +26,7 @@ import sys
 import time
 import venv
 import datetime
+import re
 
 
 # Required Std. Path Variables
@@ -64,10 +65,15 @@ signal.signal(signal.SIGINT, handler)
 signal.signal(signal.SIGTERM, handler)
 
 
-def show_progress(stream):
+def show_progress(stream, exclude_pattern=None):
     """
     Read lines from a subprocess stdout/stderr streams and write
     to sys.stdout & the logfile
+
+    arguments:
+    stream - subprocess stdout or stderr data stream
+    exclude_pattern - lines matching this reg-ex will be excluded
+                      from stdout.
     """
     while True:
         s = stream.readline()
@@ -77,7 +83,11 @@ def show_progress(stream):
         # Filter the annoying SIGTERM signal from the output when VPP is
         # terminated after a test run
         if "SIGTERM" not in data:
-            sys.stdout.write(data)
+            if exclude_pattern is not None:
+                if bool(re.search(exclude_pattern, data)) is False:
+                    sys.stdout.write(data)
+            else:
+                sys.stdout.write(data)
             logging.debug(data)
         sys.stdout.flush()
     stream.close()
@@ -222,10 +232,13 @@ def vm_test_runner(test_name, kernel_image, test_data_dir, cpu_mask, mem, jobs="
     p = Popen(
         [script, test_name, kernel_image, test_data_dir, cpu_mask, mem],
         stdout=PIPE,
-        stderr=STDOUT,
         cwd=ws_root,
     )
-    show_progress(p.stdout)
+    # Show only the test result without clobbering the stdout.
+    # The VM console displays VPP stderr & Linux IPv6 netdev change
+    # messages, which is logged by default and can be excluded.
+    exclude_pattern = r"vpp\[\d+\]:|ADDRCONF\(NETDEV_CHANGE\):"
+    show_progress(p.stdout, exclude_pattern)
     post_vm_test_run()
 
 
@@ -304,6 +317,7 @@ def run_tests_in_venv(
         f"--jobs={jobs}",
         f"--log-dir={log_dir}",
         f"--tmp-dir={log_dir}",
+        f"--cache-vpp-output",
     ]
     if running_vpp:
         args = args + [f"--use-running-vpp"]