diff --git a/CMakeLists.txt b/CMakeLists.txt
index ac4cc25..44195ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,6 +55,12 @@ else()
 	set_property(GLOBAL PROPERTY INTERPROCEDURAL_OPTIMIZATION FALSE)
 endif ()
 
+# silence mode
+option(GAPPP_SILENT "Do not print anything - for benchmark only?" OFF)
+if (GAPPP_SILENT)
+	add_compile_definitions(GAPPP_SILENT)
+endif()
+
 # GPU direct
 option(GAPPP_GPU_DIRECT "Build with GPU direct support" ON)
 if (GAPPP_GPU_DIRECT)
diff --git a/cuda-src/l3fwd.cu b/cuda-src/l3fwd.cu
index a88d489..e40ae3d 100644
--- a/cuda-src/l3fwd.cu
+++ b/cuda-src/l3fwd.cu
@@ -94,7 +94,6 @@ namespace GAPPP {
 				struct rte_ipv4_hdr *ip_hdr;
 				ip_hdr = rte_pktmbuf_mtod_offset(packets[i], struct rte_ipv4_hdr *, sizeof(rte_ether_hdr));
 				unsigned int ip_dst = ip_hdr->dst_addr;
-				printf("Post IP addr\n");
 				cudaMemcpy((void *) (gpu_dst_ips + i), &ip_dst, sizeof(unsigned int), cudaMemcpyHostToDevice);
 			}
 			cudaDeviceSynchronize();
diff --git a/include/Logging.h b/include/Logging.h
index b9639fb..c6ef9c5 100644
--- a/include/Logging.h
+++ b/include/Logging.h
@@ -34,8 +34,10 @@ namespace GAPPP {
 	};
 
 	inline void whine(Severity sev, const std::string &message, const std::string &component = "???") {
+#ifndef GAPPP_SILENT
 		std::string print_out = fmt::format("[{}/{}] {}\n", component, sev_to_string(sev), message);
 		std::cout << print_out << std::flush;
+#endif
 		if (unlikely(sev == Severity::CRIT)) {
 			throw std::runtime_error(print_out);
 		}
diff --git a/src/Router.cpp b/src/Router.cpp
index 8630602..00f3cef 100644
--- a/src/Router.cpp
+++ b/src/Router.cpp
@@ -401,6 +401,7 @@ namespace GAPPP {
 				rte_pktmbuf_free(packets[i]);
 			}
 			whine(Severity::WARN, fmt::format("No TX buffer allocated for {}", id), GAPPP_LOG_ROUTER);
+			return 0;
 		};
 		unsigned int ret = rte_ring_enqueue_burst(tx_ring, reinterpret_cast<void *const *>(packets), len, nullptr);
 		if (ret < len) {