diff --git a/tools/testing/selftests/net/ncdevmem.c b/tools/testing/selftests/net/ncdevmem.c
index 3712296d997b..7fb930571ff9 100644
--- a/tools/testing/selftests/net/ncdevmem.c
+++ b/tools/testing/selftests/net/ncdevmem.c
@@ -77,7 +77,6 @@ static void print_nonzero_bytes(void *ptr, size_t size)
 
 	for (i = 0; i < size; i++)
 		putchar(p[i]);
-	printf("\n");
 }
 
 #define run_command(cmd, ...)                                           \
@@ -85,7 +84,7 @@ static void print_nonzero_bytes(void *ptr, size_t size)
 		char command[256];                                      \
 		memset(command, 0, sizeof(command));                    \
 		snprintf(command, sizeof(command), cmd, ##__VA_ARGS__); \
-		printf("Running: %s\n", command);                       \
+		fprintf(stderr, "Running: %s\n", command);                       \
 		system(command);                                        \
 	})
 
@@ -93,22 +92,22 @@ static int reset_flow_steering(void)
 {
 	int ret = 0;
 
-	ret = run_command("sudo ethtool -K %s ntuple off", ifname);
+	ret = run_command("sudo ethtool -K %s ntuple off >&2", ifname);
 	if (ret)
 		return ret;
 
-	return run_command("sudo ethtool -K %s ntuple on", ifname);
+	return run_command("sudo ethtool -K %s ntuple on >&2", ifname);
 }
 
 static int configure_headersplit(bool on)
 {
-	return run_command("sudo ethtool -G %s tcp-data-split %s", ifname,
+	return run_command("sudo ethtool -G %s tcp-data-split %s >&2", ifname,
 			   on ? "on" : "off");
 }
 
 static int configure_rss(void)
 {
-	return run_command("sudo ethtool -X %s equal %d", ifname, start_queue);
+	return run_command("sudo ethtool -X %s equal %d >&2", ifname, start_queue);
 }
 
 static int configure_channels(unsigned int rx, unsigned int tx)
@@ -118,7 +117,7 @@ static int configure_channels(unsigned int rx, unsigned int tx)
 
 static int configure_flow_steering(void)
 {
-	return run_command("sudo ethtool -N %s flow-type tcp4 src-ip %s dst-ip %s src-port %s dst-port %s queue %d",
+	return run_command("sudo ethtool -N %s flow-type tcp4 src-ip %s dst-ip %s src-port %s dst-port %s queue %d >&2",
 			   ifname, client_ip, server_ip, port, port, start_queue);
 }
 
@@ -152,7 +151,7 @@ static int bind_rx_queue(unsigned int ifindex, unsigned int dmabuf_fd,
 		goto err_close;
 	}
 
-	printf("got dmabuf id=%d\n", rsp->id);
+	fprintf(stderr, "got dmabuf id=%d\n", rsp->id);
 	dmabuf_id = rsp->id;
 
 	netdev_bind_rx_req_free(req);
@@ -279,8 +278,8 @@ int do_server(void)
 	if (ret)
 		error(errno, errno, "%s: [FAIL, set sock opt]\n", TEST_PREFIX);
 
-	printf("binding to address %s:%d\n", server_ip,
-	       ntohs(server_sin.sin_port));
+	fprintf(stderr, "binding to address %s:%d\n", server_ip,
+		ntohs(server_sin.sin_port));
 
 	ret = bind(socket_fd, &server_sin, sizeof(server_sin));
 	if (ret)
@@ -294,14 +293,14 @@ int do_server(void)
 
 	inet_ntop(server_sin.sin_family, &server_sin.sin_addr, buffer,
 		  sizeof(buffer));
-	printf("Waiting or connection on %s:%d\n", buffer,
-	       ntohs(server_sin.sin_port));
+	fprintf(stderr, "Waiting or connection on %s:%d\n", buffer,
+		ntohs(server_sin.sin_port));
 	client_fd = accept(socket_fd, &client_addr, &client_addr_len);
 
 	inet_ntop(client_addr.sin_family, &client_addr.sin_addr, buffer,
 		  sizeof(buffer));
-	printf("Got connection from %s:%d\n", buffer,
-	       ntohs(client_addr.sin_port));
+	fprintf(stderr, "Got connection from %s:%d\n", buffer,
+		ntohs(client_addr.sin_port));
 
 	while (1) {
 		struct iovec iov = { .iov_base = iobuf,
@@ -314,14 +313,13 @@ int do_server(void)
 		ssize_t ret;
 
 		is_devmem = false;
-		printf("\n\n");
 
 		msg.msg_iov = &iov;
 		msg.msg_iovlen = 1;
 		msg.msg_control = ctrl_data;
 		msg.msg_controllen = sizeof(ctrl_data);
 		ret = recvmsg(client_fd, &msg, MSG_SOCK_DEVMEM);
-		printf("recvmsg ret=%ld\n", ret);
+		fprintf(stderr, "recvmsg ret=%ld\n", ret);
 		if (ret < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
 			continue;
 		if (ret < 0) {
@@ -329,7 +327,7 @@ int do_server(void)
 			continue;
 		}
 		if (ret == 0) {
-			printf("client exited\n");
+			fprintf(stderr, "client exited\n");
 			goto cleanup;
 		}
 
@@ -338,7 +336,7 @@ int do_server(void)
 			if (cm->cmsg_level != SOL_SOCKET ||
 			    (cm->cmsg_type != SCM_DEVMEM_DMABUF &&
 			     cm->cmsg_type != SCM_DEVMEM_LINEAR)) {
-				fprintf(stdout, "skipping non-devmem cmsg\n");
+				fprintf(stderr, "skipping non-devmem cmsg\n");
 				continue;
 			}
 
@@ -349,7 +347,7 @@ int do_server(void)
 				/* TODO: process data copied from skb's linear
 				 * buffer.
 				 */
-				fprintf(stdout,
+				fprintf(stderr,
 					"SCM_DEVMEM_LINEAR. dmabuf_cmsg->frag_size=%u\n",
 					dmabuf_cmsg->frag_size);
 
@@ -360,12 +358,13 @@ int do_server(void)
 			token.token_count = 1;
 
 			total_received += dmabuf_cmsg->frag_size;
-			printf("received frag_page=%llu, in_page_offset=%llu, frag_offset=%llu, frag_size=%u, token=%u, total_received=%lu, dmabuf_id=%u\n",
-			       dmabuf_cmsg->frag_offset >> PAGE_SHIFT,
-			       dmabuf_cmsg->frag_offset % getpagesize(),
-			       dmabuf_cmsg->frag_offset, dmabuf_cmsg->frag_size,
-			       dmabuf_cmsg->frag_token, total_received,
-			       dmabuf_cmsg->dmabuf_id);
+			fprintf(stderr,
+				"received frag_page=%llu, in_page_offset=%llu, frag_offset=%llu, frag_size=%u, token=%u, total_received=%lu, dmabuf_id=%u\n",
+				dmabuf_cmsg->frag_offset >> PAGE_SHIFT,
+				dmabuf_cmsg->frag_offset % getpagesize(),
+				dmabuf_cmsg->frag_offset,
+				dmabuf_cmsg->frag_size, dmabuf_cmsg->frag_token,
+				total_received, dmabuf_cmsg->dmabuf_id);
 
 			if (dmabuf_cmsg->dmabuf_id != dmabuf_id)
 				error(1, 0,
@@ -397,15 +396,15 @@ int do_server(void)
 		if (!is_devmem)
 			error(1, 0, "flow steering error\n");
 
-		printf("total_received=%lu\n", total_received);
+		fprintf(stderr, "total_received=%lu\n", total_received);
 	}
 
-	fprintf(stdout, "%s: ok\n", TEST_PREFIX);
+	fprintf(stderr, "%s: ok\n", TEST_PREFIX);
 
-	fprintf(stdout, "page_aligned_frags=%lu, non_page_aligned_frags=%lu\n",
+	fprintf(stderr, "page_aligned_frags=%lu, non_page_aligned_frags=%lu\n",
 		page_aligned_frags, non_page_aligned_frags);
 
-	fprintf(stdout, "page_aligned_frags=%lu, non_page_aligned_frags=%lu\n",
+	fprintf(stderr, "page_aligned_frags=%lu, non_page_aligned_frags=%lu\n",
 		page_aligned_frags, non_page_aligned_frags);
 
 cleanup:
@@ -511,7 +510,7 @@ int main(int argc, char *argv[])
 			probe = 1;
 			break;
 		case '?':
-			printf("unknown option: %c\n", optopt);
+			fprintf(stderr, "unknown option: %c\n", optopt);
 			break;
 		}
 	}
@@ -519,7 +518,7 @@ int main(int argc, char *argv[])
 	ifindex = if_nametoindex(ifname);
 
 	for (; optind < argc; optind++)
-		printf("extra arguments: %s\n", argv[optind]);
+		fprintf(stderr, "extra arguments: %s\n", argv[optind]);
 
 	if (probe) {
 		run_devmem_tests();
