diff --git a/test/cpp/microbenchmarks/bm_callback_unary_ping_pong.cc b/test/cpp/microbenchmarks/bm_callback_unary_ping_pong.cc
index c0a7054bf51..bcbde5db035 100644
--- a/test/cpp/microbenchmarks/bm_callback_unary_ping_pong.cc
+++ b/test/cpp/microbenchmarks/bm_callback_unary_ping_pong.cc
@@ -34,12 +34,15 @@ auto& force_library_initialization = Library::get();
 static void SweepSizesArgs(benchmark::internal::Benchmark* b) {
   b->Args({0, 0});
   for (int i = 1; i <= 128 * 1024 * 1024; i *= 8) {
+    // First argument is the message size of request
+    // Second argument is the message size of response
     b->Args({i, 0});
     b->Args({0, i});
     b->Args({i, i});
   }
 }
 
+// Unary ping pong with different message size of request and response
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
                    NoOpMutator)
     ->Apply(SweepSizesArgs);
@@ -52,6 +55,8 @@ BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2, NoOpMutator,
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, MinInProcessCHTTP2, NoOpMutator,
                    NoOpMutator)
     ->Apply(SweepSizesArgs);
+
+// Client context with different metadata
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess,
                    Client_AddMetadata<RandomBinaryMetadata<10>, 1>, NoOpMutator)
     ->Args({0, 0});
@@ -72,15 +77,6 @@ BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess,
                    Client_AddMetadata<RandomBinaryMetadata<100>, 2>,
                    NoOpMutator)
     ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
-                   Server_AddInitialMetadata<RandomBinaryMetadata<10>, 1>)
-    ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
-                   Server_AddInitialMetadata<RandomBinaryMetadata<31>, 1>)
-    ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
-                   Server_AddInitialMetadata<RandomBinaryMetadata<100>, 1>)
-    ->Args({0, 0});
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess,
                    Client_AddMetadata<RandomAsciiMetadata<10>, 1>, NoOpMutator)
     ->Args({0, 0});
@@ -90,18 +86,6 @@ BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess,
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess,
                    Client_AddMetadata<RandomAsciiMetadata<100>, 1>, NoOpMutator)
     ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
-                   Server_AddInitialMetadata<RandomAsciiMetadata<10>, 1>)
-    ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
-                   Server_AddInitialMetadata<RandomAsciiMetadata<31>, 1>)
-    ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
-                   Server_AddInitialMetadata<RandomAsciiMetadata<100>, 1>)
-    ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
-                   Server_AddInitialMetadata<RandomAsciiMetadata<10>, 100>)
-    ->Args({0, 0});
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2,
                    Client_AddMetadata<RandomBinaryMetadata<10>, 1>, NoOpMutator)
     ->Args({0, 0});
@@ -122,15 +106,6 @@ BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2,
                    Client_AddMetadata<RandomBinaryMetadata<100>, 2>,
                    NoOpMutator)
     ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2, NoOpMutator,
-                   Server_AddInitialMetadata<RandomBinaryMetadata<10>, 1>)
-    ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2, NoOpMutator,
-                   Server_AddInitialMetadata<RandomBinaryMetadata<31>, 1>)
-    ->Args({0, 0});
-BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2, NoOpMutator,
-                   Server_AddInitialMetadata<RandomBinaryMetadata<100>, 1>)
-    ->Args({0, 0});
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2,
                    Client_AddMetadata<RandomAsciiMetadata<10>, 1>, NoOpMutator)
     ->Args({0, 0});
@@ -140,6 +115,38 @@ BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2,
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2,
                    Client_AddMetadata<RandomAsciiMetadata<100>, 1>, NoOpMutator)
     ->Args({0, 0});
+
+// Server context with different metadata
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
+                   Server_AddInitialMetadata<RandomBinaryMetadata<10>, 1>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
+                   Server_AddInitialMetadata<RandomBinaryMetadata<31>, 1>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
+                   Server_AddInitialMetadata<RandomBinaryMetadata<100>, 1>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
+                   Server_AddInitialMetadata<RandomAsciiMetadata<10>, 1>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
+                   Server_AddInitialMetadata<RandomAsciiMetadata<31>, 1>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
+                   Server_AddInitialMetadata<RandomAsciiMetadata<100>, 1>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcess, NoOpMutator,
+                   Server_AddInitialMetadata<RandomAsciiMetadata<10>, 100>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2, NoOpMutator,
+                   Server_AddInitialMetadata<RandomBinaryMetadata<10>, 1>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2, NoOpMutator,
+                   Server_AddInitialMetadata<RandomBinaryMetadata<31>, 1>)
+    ->Args({0, 0});
+BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2, NoOpMutator,
+                   Server_AddInitialMetadata<RandomBinaryMetadata<100>, 1>)
+    ->Args({0, 0});
 BENCHMARK_TEMPLATE(BM_CallbackUnaryPingPong, InProcessCHTTP2, NoOpMutator,
                    Server_AddInitialMetadata<RandomAsciiMetadata<10>, 1>)
     ->Args({0, 0});
diff --git a/test/cpp/microbenchmarks/callback_streaming_ping_pong.h b/test/cpp/microbenchmarks/callback_streaming_ping_pong.h
index 1710a754803..fc74e2757ba 100644
--- a/test/cpp/microbenchmarks/callback_streaming_ping_pong.h
+++ b/test/cpp/microbenchmarks/callback_streaming_ping_pong.h
@@ -61,8 +61,8 @@ static void BM_CallbackBidiStreaming(benchmark::State& state) {
   }
   fixture->Finish(state);
   fixture.reset();
-  state.SetBytesProcessed(2 * state.range(0) * state.iterations() *
-                          state.range(1));
+  state.SetBytesProcessed(2 * message_size * max_ping_pongs
+                          * state.iterations());
 }
 
 }  // namespace testing
diff --git a/test/cpp/microbenchmarks/callback_test_service.cc b/test/cpp/microbenchmarks/callback_test_service.cc
index caa734d90e8..eebf6e31241 100644
--- a/test/cpp/microbenchmarks/callback_test_service.cc
+++ b/test/cpp/microbenchmarks/callback_test_service.cc
@@ -64,14 +64,6 @@ CallbackStreamingTestService::BidiStream() {
           kServerFinishAfterNReads, context->client_metadata(), 0);
       message_size_ = GetIntValueFromMetadata(kServerResponseStreamsToSend,
                                               context->client_metadata(), 0);
-      //      EchoRequest* request = new EchoRequest;
-      //      if (message_size_ > 0) {
-      //        request->set_message(std::string(message_size_, 'a'));
-      //      } else {
-      //        request->set_message("");
-      //      }
-      //
-      //      request_ = request;
       StartRead(&request_);
       on_started_done_ = true;
     }
@@ -80,7 +72,6 @@ CallbackStreamingTestService::BidiStream() {
     void OnReadDone(bool ok) override {
       if (ok) {
         num_msgs_read_++;
-        //        gpr_log(GPR_INFO, "recv msg %s", request_.message().c_str());
         if (message_size_ > 0) {
           response_.set_message(std::string(message_size_, 'a'));
         } else {
diff --git a/test/cpp/microbenchmarks/callback_unary_ping_pong.h b/test/cpp/microbenchmarks/callback_unary_ping_pong.h
index 01477e6402d..19449341747 100644
--- a/test/cpp/microbenchmarks/callback_unary_ping_pong.h
+++ b/test/cpp/microbenchmarks/callback_unary_ping_pong.h
@@ -38,6 +38,8 @@ namespace testing {
 
 template <class Fixture, class ClientContextMutator, class ServerContextMutator>
 static void BM_CallbackUnaryPingPong(benchmark::State& state) {
+  int request_msgs_size = state.range(0);
+  int response_msgs_size = state.range(1);
   CallbackStreamingTestService service;
   std::unique_ptr<Fixture> fixture(new Fixture(&service));
   std::unique_ptr<EchoTestService::Stub> stub_(
@@ -76,8 +78,8 @@ static void BM_CallbackUnaryPingPong(benchmark::State& state) {
   }
   fixture->Finish(state);
   fixture.reset();
-  state.SetBytesProcessed(state.range(0) * state.iterations() +
-                          state.range(1) * state.iterations());
+  state.SetBytesProcessed(request_msgs_size * state.iterations() +
+                          response_msgs_size * state.iterations());
 }
 }  // namespace testing
 }  // namespace grpc