diff --git a/src/mem/coherent_xbar.hh b/src/mem/coherent_xbar.hh
--- a/src/mem/coherent_xbar.hh
+++ b/src/mem/coherent_xbar.hh
@@ -394,6 +394,7 @@
     bool sinkPacket(const PacketPtr pkt) const;
 
     Stats::Scalar snoops;
+    Stats::Scalar snoopTraffic;
     Stats::Distribution snoopFanout;
 
   public:
# Node ID 6fc8f1dda721ea430eea2f29fbfe594c37e7c4e5
# Parent  e273e86a873d4c9542186f9268883f3249a33621
diff --git a/src/mem/coherent_xbar.cc b/src/mem/coherent_xbar.cc
--- a/src/mem/coherent_xbar.cc
+++ b/src/mem/coherent_xbar.cc
@@ -316,8 +316,10 @@
         pktSize[slave_port_id][master_port_id] += pkt_size;
         transDist[pkt_cmd]++;
 
-        if (is_express_snoop)
+        if (is_express_snoop) {
             snoops++;
+            snoopTraffic += pkt_size;
+        }
     }
 
     if (sink_packet)
@@ -414,8 +416,10 @@
             pkt->getAddr());
 
     // update stats here as we know the forwarding will succeed
+    unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0;
     transDist[pkt->cmdToIndex()]++;
     snoops++;
+    snoopTraffic += pkt_size;
 
     // we should only see express snoops from caches
     assert(pkt->isExpressSnoop());
@@ -587,6 +591,7 @@
     // stats updates
     transDist[pkt_cmd]++;
     snoops++;
+    snoopTraffic += pkt_size;
 
     return true;
 }
@@ -738,7 +743,9 @@
             pkt->cmdString());
 
     // add the request snoop data
+    unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0;
     snoops++;
+    snoopTraffic += pkt_size;
 
     // forward to all snoopers
     std::pair<MemCmd, Tick> snoop_result;
@@ -964,6 +971,11 @@
         .desc("Total snoops (count)")
     ;
 
+    snoopTraffic
+        .name(name() + ".snoopTraffic")
+        .desc("Total snoop traffic (bytes)")
+    ;
+
     snoopFanout
         .init(0, snoopPorts.size(), 1)
         .name(name() + ".snoop_fanout")