diff -r 76718cb08673 -r 7d5c6434fd41 configs/common/CacheConfig.py
--- a/configs/common/CacheConfig.py	Tue Jul 12 08:10:22 2016 +0100
+++ b/configs/common/CacheConfig.py	Tue Jul 12 08:10:41 2016 +0100
@@ -162,11 +162,6 @@
         else:
             system.cpu[i].connectAllPorts(system.membus)
 
-        # Add a snoop filter to the membus if there are caches above it
-        if (options.l2cache or options.caches) and \
-        (system.membus.snoop_filter == NULL):
-            system.membus.snoop_filter = SnoopFilter()
-
     return system
 
 # ExternalSlave provides a "port", but when that port connects to a cache,
diff -r 76718cb08673 -r 7d5c6434fd41 src/mem/XBar.py
--- a/src/mem/XBar.py	Tue Jul 12 08:10:22 2016 +0100
+++ b/src/mem/XBar.py	Tue Jul 12 08:10:41 2016 +0100
@@ -153,6 +153,9 @@
     response_latency = 2
     snoop_response_latency = 4
 
+    # Use a snoop-filter by default
+    snoop_filter = SnoopFilter(lookup_latency = 1)
+
     # This specialisation of the coherent crossbar is to be considered
     # the point of coherency, as there are no (coherent) downstream
     # caches.
diff -r 76718cb08673 -r 7d5c6434fd41 tests/configs/base_config.py
--- a/tests/configs/base_config.py	Tue Jul 12 08:10:22 2016 +0100
+++ b/tests/configs/base_config.py	Tue Jul 12 08:10:41 2016 +0100
@@ -126,9 +126,6 @@
             cpu.createInterruptController()
             cpu.connectAllPorts(sha_bus if sha_bus != None else system.membus,
                                 system.membus)
-            # System has caches before the membus -> add snoop filter
-            if sha_bus and system.membus.snoop_filter == NULL:
-                system.membus.snoop_filter = SnoopFilter()
 
     def init_kvm(self, system):
         """Do KVM-specific system initialization.
@@ -152,9 +149,7 @@
             self.init_kvm(system)
 
         sha_bus = self.create_caches_shared(system)
-        # System has caches before the membus -> add snoop filter
-        if sha_bus and system.membus.snoop_filter == NULL:
-            system.membus.snoop_filter = SnoopFilter()
+
         for cpu in system.cpu:
             self.init_cpu(system, cpu, sha_bus)