diff -r 1fe2beace503 -r 756b63187a8e src/cpu/testers/traffic_gen/generators.cc
--- a/src/cpu/testers/traffic_gen/generators.cc	Thu Feb 19 08:01:11 2015 +0000
+++ b/src/cpu/testers/traffic_gen/generators.cc	Thu Feb 19 08:01:33 2015 +0000
@@ -57,6 +57,9 @@
 {
     // Create new request
     Request *req = new Request(addr, size, flags, masterID);
+    // Dummy PC to have PC-based prefetchers latch on; get entropy into higher
+    // bits
+    req->setPC(((Addr)masterID) << 2);
 
     // Embed it in a packet
     PacketPtr pkt = new Packet(req, cmd);