diff -r 4a5f52f2defa -r 2e534f2df8f5 configs/example/memtest.py
--- a/configs/example/memtest.py	Fri Jan 29 17:47:15 2016 -0600
+++ b/configs/example/memtest.py	Mon Feb 01 17:21:57 2016 -0600
@@ -217,7 +217,7 @@
                        progress_interval = options.progress)
 
 # Set up the system along with a simple memory and reference memory
-system = System(physmem = SimpleMemory(),
+system = System(physmem = DDR3_1600_x64(),
                 cache_line_size = block_size)
 
 system.voltage_domain = VoltageDomain(voltage = '1V')
diff -r 4a5f52f2defa -r 2e534f2df8f5 src/mem/packet_queue.cc
--- a/src/mem/packet_queue.cc	Fri Jan 29 17:47:15 2016 -0600
+++ b/src/mem/packet_queue.cc	Mon Feb 01 17:21:57 2016 -0600
@@ -115,8 +115,8 @@
 
     // add a very basic sanity check on the port to ensure the
     // invisible buffer is not growing beyond reasonable limits
-    if (!_disableSanityCheck && transmitList.size() > 100) {
-        panic("Packet queue %s has grown beyond 100 packets\n",
+    if (!_disableSanityCheck && transmitList.size() > 4) {
+        panic("Packet queue %s has grown beyond 4 packets\n",
               name());
     }