diff --git a/test/contrib/automotive/scanner/enumerator.uts b/test/contrib/automotive/scanner/enumerator.uts
index 70f725a51ce..d405cac07a1 100644
--- a/test/contrib/automotive/scanner/enumerator.uts
+++ b/test/contrib/automotive/scanner/enumerator.uts
@@ -219,6 +219,7 @@ class MockISOTPSocket(SuperSocket):
         return len(sx)
     @staticmethod
     def select(sockets, remain=None):
+        time.sleep(0)
         return sockets
 
 sock = MockISOTPSocket()
diff --git a/test/sendsniff.uts b/test/sendsniff.uts
index c72fb832037..78b6e16fdc0 100644
--- a/test/sendsniff.uts
+++ b/test/sendsniff.uts
@@ -7,8 +7,12 @@
 + Test bridge_and_sniff() using tap sockets
 
 ~ tap
+
 = Create two tap interfaces
 
+import subprocess
+from threading import Thread
+
 tap0, tap1 = [TunTapInterface("tap%d" % i) for i in range(2)]
 
 chk_kwargs = {"timeout": 3}
@@ -264,43 +268,6 @@ with VEthPair('a_0', 'a_1') as veth_0:
         assert (xfrm_count['b_0'] == 2)
 
 
-= sr() performance test
-
-import subprocess
-import shlex
-
-try:
-    # Create a dedicated network name space to simulate remote host
-    subprocess.check_call(shlex.split("sudo ip netns add scapy"))
-    # Create a virtual Ethernet pair to connect default and new NS
-    subprocess.check_call(shlex.split("sudo ip link add type veth"))
-    # Move veth1 to the new NS
-    subprocess.check_call(shlex.split("sudo ip link set veth1 netns scapy"))
-    # Setup vNIC in the default NS
-    subprocess.check_call(shlex.split("sudo ip link set veth0 up"))
-    subprocess.check_call(shlex.split("sudo ip addr add 192.168.168.1/24 dev veth0"))
-    # Setup vNIC in the dedicated NS
-    subprocess.check_call(shlex.split("sudo ip netns exec scapy ip link set lo up"))
-    subprocess.check_call(shlex.split("sudo ip netns exec scapy ip link set veth1 up"))
-    subprocess.check_call(shlex.split("sudo ip netns exec scapy ip addr add 192.168.168.2/24 dev veth1"))
-    # Perform test
-    conf.route.resync()
-    res, unansw = sr(IP(dst='192.168.168.2') / ICMP(seq=(1, 1000)), timeout=1, verbose=False)
-finally:
-    try:
-        # Bring down the interfaces
-        subprocess.check_call(shlex.split("sudo ip netns exec scapy ip link set veth1 down"))
-        subprocess.check_call(shlex.split("sudo ip netns exec scapy ip link set lo down"))
-        # Delete the namespace
-        subprocess.check_call(shlex.split("sudo ip netns delete scapy"))
-        # Remove the virtual Ethernet pair
-        subprocess.check_call(shlex.split("sudo ip link delete veth0"))
-    except subprocess.CalledProcessError as e:
-        print(f"Error during cleanup: {e}")
-
-len(res) == 1000
-
-
 ############
 ############
 + Test arpleak() using a tap socket
@@ -428,3 +395,42 @@ finally:
     e = os.system("ip netns del blob1")
     conf.ifaces.reload()
     conf.route.resync()
+
+
+= sr() performance test
+~ linux needs_root veth
+
+import subprocess
+import shlex
+
+try:
+    # Create a dedicated network name space to simulate remote host
+    subprocess.check_call(shlex.split("sudo ip netns add scapy"))
+    # Create a virtual Ethernet pair to connect default and new NS
+    subprocess.check_call(shlex.split("sudo ip link add type veth"))
+    # Move veth1 to the new NS
+    subprocess.check_call(shlex.split("sudo ip link set veth1 netns scapy"))
+    # Setup vNIC in the default NS
+    subprocess.check_call(shlex.split("sudo ip link set veth0 up"))
+    subprocess.check_call(shlex.split("sudo ip addr add 192.168.168.1/24 dev veth0"))
+    # Setup vNIC in the dedicated NS
+    subprocess.check_call(shlex.split("sudo ip netns exec scapy ip link set lo up"))
+    subprocess.check_call(shlex.split("sudo ip netns exec scapy ip link set veth1 up"))
+    subprocess.check_call(shlex.split("sudo ip netns exec scapy ip addr add 192.168.168.2/24 dev veth1"))
+    # Perform test
+    conf.route.resync()
+    res, unansw = sr(IP(dst='192.168.168.2') / ICMP(seq=(1, 1000)), timeout=1, verbose=False)
+finally:
+    try:
+        # Bring down the interfaces
+        subprocess.check_call(shlex.split("sudo ip netns exec scapy ip link set veth1 down"))
+        subprocess.check_call(shlex.split("sudo ip netns exec scapy ip link set lo down"))
+        # Delete the namespace
+        subprocess.check_call(shlex.split("sudo ip netns delete scapy"))
+        # Remove the virtual Ethernet pair
+        subprocess.check_call(shlex.split("sudo ip link delete veth0"))
+    except subprocess.CalledProcessError as e:
+        print(f"Error during cleanup: {e}")
+
+len(res) == 1000
+