diff --git a/src/common/config_opts.h b/src/common/config_opts.h
index 6b97c82cfba..ff674cfc19b 100644
--- a/src/common/config_opts.h
+++ b/src/common/config_opts.h
@@ -126,6 +126,7 @@ OPTION(ms_inject_delay_msg_type, OPT_STR, "")      // the type of message to del
 OPTION(ms_inject_delay_max, OPT_DOUBLE, 1)         // seconds
 OPTION(ms_inject_delay_probability, OPT_DOUBLE, 0) // range [0, 1]
 OPTION(ms_inject_internal_delays, OPT_DOUBLE, 0)   // seconds
+OPTION(ms_dump_on_send, OPT_BOOL, false)           // hexdump msg to log on send
 
 OPTION(inject_early_sigterm, OPT_BOOL, false)
 
diff --git a/src/msg/SimpleMessenger.cc b/src/msg/SimpleMessenger.cc
index e11783dd0ab..2070fe59124 100644
--- a/src/msg/SimpleMessenger.cc
+++ b/src/msg/SimpleMessenger.cc
@@ -399,6 +399,19 @@ ConnectionRef SimpleMessenger::get_loopback_connection()
 void SimpleMessenger::submit_message(Message *m, Connection *con,
 				     const entity_addr_t& dest_addr, int dest_type, bool lazy)
 {
+
+  if (cct->_conf->ms_dump_on_send) {
+    m->encode(-1, true);
+    ldout(cct, 0) << "submit_message " << *m << "\n";
+    m->get_payload().hexdump(*_dout);
+    if (m->get_data().length() > 0) {
+      *_dout << " data:\n";
+      m->get_data().hexdump(*_dout);
+    }
+    *_dout << dendl;
+    m->clear_payload();
+  }
+
   // existing connection?
   if (con) {
     Pipe *pipe = NULL;