diff --git a/include/jsonrpc-c.h b/include/jsonrpc-c.h
index b17fa85..984c6ca 100644
--- a/include/jsonrpc-c.h
+++ b/include/jsonrpc-c.h
@@ -43,6 +43,7 @@ struct jrpc_procedure {
 	char * name;
 	jrpc_function function;
 	void *data;
+	int allow:1;
 };
 
 struct jrpc_server {
diff --git a/src/jsonrpc-c.c b/src/jsonrpc-c.c
index 09c1b36..a5f52ec 100644
--- a/src/jsonrpc-c.c
+++ b/src/jsonrpc-c.c
@@ -15,6 +15,7 @@
 #include <netinet/in.h>
 #include <netdb.h>
 #include <arpa/inet.h>
+#include <sys/wait.h>
 
 #include "jsonrpc-c.h"
 
@@ -32,10 +33,17 @@ static void *get_in_addr(struct sockaddr *sa) {
 }
 
 static int send_response(struct jrpc_connection * conn, char *response) {
+	int l, len, send;
 	int fd = conn->fd;
 	if (conn->debug_level > 1)
 		printf("JSON Response:\n%s\n", response);
-	write(fd, response, strlen(response));
+
+	for (send = 0, len = strlen(response); send < len; send += l) {
+		l = write(fd, response+send, len - send);
+		if (l < 0)
+			break;
+	}
+
 	write(fd, "\n", 1);
 	return 0;
 }
@@ -72,6 +80,39 @@ static int send_result(struct jrpc_connection * conn, cJSON * result,
 	return return_value;
 }
 
+static int selftest_procedure(struct jrpc_server *server) {
+	pid_t pid;
+
+	int i = server->procedure_count;
+	while (i--) {
+		cJSON *fake = cJSON_CreateObject();
+		jrpc_context ctx;
+		ctx.error_code = 0;
+		ctx.error_message = NULL;
+		ctx.data = server->procedures[i].data;
+		jrpc_function function = server->procedures[i].function;
+		char *name = server->procedures[i].name;
+
+		pid = fork();
+		if (pid < 0)
+			fprintf(stderr, "selftest: Fork failed!\n");
+		else if (pid == 0) {
+			printf("selftest:%s\n", name); //WARNING!!!: if delete this print, the selftest will crash!
+			function(&ctx, fake, fake);
+
+			exit(0);
+		} else {
+			int stat_loc;
+
+			if (waitpid(pid, &stat_loc, 0) != pid)
+				fprintf(stderr, "selftest: Wait pid(%d) error\n", pid);
+
+			if (!stat_loc)
+				server->procedures[i].allow = 1;
+		}
+	}
+}
+
 static int invoke_procedure(struct jrpc_server *server,
 		struct jrpc_connection * conn, char *name, cJSON *params, cJSON *id) {
 	cJSON *returned = NULL;
@@ -81,7 +122,8 @@ static int invoke_procedure(struct jrpc_server *server,
 	ctx.error_message = NULL;
 	int i = server->procedure_count;
 	while (i--) {
-		if (!strcmp(server->procedures[i].name, name)) {
+		if (!strcmp(server->procedures[i].name, name) &&
+				server->procedures[i].allow) {
 			procedure_found = 1;
 			ctx.data = server->procedures[i].data;
 			returned = server->procedures[i].function(&ctx, params, id);
@@ -204,6 +246,7 @@ static void connection_cb(struct ev_loop *loop, ev_io *w, int revents) {
 		}
 	}
 
+	return close_connection(loop, w);
 }
 
 static void accept_cb(struct ev_loop *loop, ev_io *w, int revents) {
@@ -341,6 +384,7 @@ static int __jrpc_server_start(struct jrpc_server *server) {
 #endif
 
 void jrpc_server_run(struct jrpc_server *server){
+	selftest_procedure(server);
 	EV_RUN(server->loop, 0);
 }
 
diff --git a/src/modules/sysstat-lite/src/ioconf.c b/src/modules/sysstat-lite/src/ioconf.c
index ab5dcd5..cb2be81 100644
--- a/src/modules/sysstat-lite/src/ioconf.c
+++ b/src/modules/sysstat-lite/src/ioconf.c
@@ -38,6 +38,7 @@
 #else
 #define _(string) (string)
 #endif
+#include <sys/sysmacros.h>
 
 static unsigned int ioc_parsed = 0;
 static struct ioc_entry *ioconf[MAX_BLKDEV + 1];
diff --git a/src/server.c b/src/server.c
index e211fb4..f39df76 100644
--- a/src/server.c
+++ b/src/server.c
@@ -27,10 +27,11 @@ static int debug; /* enable this to printf */
 	} while(0)
 
 #define PORT 12307  // the port users will be connecting to
-#define PROC_BUFF 8192
+#define PROC_BUFF (1024 * 512) //8192
 unsigned char proc_buff[PROC_BUFF];
 
-#define CMD_BUFF 16384
+#define CMD_BUFF (1024 * 1024) //163840
+#define PERF_CMD_BUFF (1024 * 1024 * 10) //163840
 unsigned char cmd_buff[CMD_BUFF];
 
 struct jrpc_server my_server;
@@ -226,19 +227,30 @@ cJSON * run_cmd(jrpc_context * ctx, cJSON * params, cJSON *id)
 {
 	FILE *fp;
 	int size;
+	unsigned char *buffer;
+	cJSON *ret;
 
 	if (!ctx->data)
 		return NULL;
 
 	fp = popen(ctx->data, "r");
 	if (fp) {
-		memset(cmd_buff, 0, CMD_BUFF);
-		size = fread(cmd_buff, 1, CMD_BUFF - strlen(endstring) - 1 , fp);
+		buffer = (unsigned char *)malloc(CMD_BUFF);
+		if (buffer == NULL) {
+			pclose(fp);
+			return NULL;
+		}
+
+		memset(buffer, 0, CMD_BUFF);
+		size = fread(buffer, 1, CMD_BUFF - strlen(endstring) - 1 , fp);
 		DEBUG_PRINT("run_cmd:size %d:%s\n", size, (char *)ctx->data);
 		pclose(fp);
 
-		strcat(cmd_buff, endstring);
-		return cJSON_CreateString(cmd_buff);
+		strcat(buffer, endstring);
+		ret = cJSON_CreateString(buffer);
+		free(buffer);
+
+		return ret;
 	}
 	return NULL;
 }
@@ -270,6 +282,8 @@ cJSON * run_perf_script_cmd(jrpc_context * ctx, cJSON * params, cJSON *id)
 {
 	FILE *fp;
 	int size;
+	unsigned char *buffer;
+	cJSON *ret;
 
 	if (!ctx->data)
 		return NULL;
@@ -277,13 +291,22 @@ cJSON * run_perf_script_cmd(jrpc_context * ctx, cJSON * params, cJSON *id)
 	system(ctx->data);
 	fp = popen("perf script", "r");
 	if (fp) {
-		memset(cmd_buff, 0, CMD_BUFF);
-		size = fread(cmd_buff, 1, CMD_BUFF - strlen(endstring) - 1, fp);
+		buffer = (unsigned char *)malloc(PERF_CMD_BUFF);
+		if (buffer == NULL) {
+			pclose(fp);
+			return NULL;
+		}
+
+		memset(buffer, 0, PERF_CMD_BUFF);
+		size = fread(buffer, 1, CMD_BUFF - strlen(endstring) - 1, fp);
 		DEBUG_PRINT("run_cmd:size %d:%s\n", size, (char *)ctx->data);
 		pclose(fp);
 
-		strcat(cmd_buff, endstring);
-		return cJSON_CreateString(cmd_buff);
+		strcat(buffer, endstring);
+		ret = cJSON_CreateString(buffer);
+		free(buffer);
+
+		return ret;
 	}
 	return NULL;
 }
@@ -309,10 +332,12 @@ int main(int argc, char **argv)
 	 * so, don't close them; but we want to mute errors
 	 * just like a typical daemon
 	 */
+#if 0
 	daemon(0, 1);
 	fd = open ("/dev/null", O_RDWR, 0);
 	if (fd != -1)
 		dup2 (fd, STDERR_FILENO);
+#endif
 
 	jrpc_server_init(&my_server, PORT);
 	jrpc_register_procedure(&my_server, say_hello, "SayHello", NULL);
@@ -335,7 +360,7 @@ int main(int argc, char **argv)
 	/*********************************************
 	 *
 	 * ****************************************/
-	jrpc_register_procedure(&my_server, run_builtin_cmd, "GetCmdIotop", "iotop");
+	//jrpc_register_procedure(&my_server, run_builtin_cmd, "GetCmdIotop", "iotop -n 1 -b");
 	//jrpc_register_procedure(&my_server, run_builtin_cmd, "GetCmdIopp", "iopp");
 	jrpc_register_procedure(&my_server, run_builtin_cmd, "GetCmdFree", "free");
 	jrpc_register_procedure(&my_server, run_builtin_cmd, "GetCmdProcrank", "procrank");
@@ -344,7 +369,8 @@ int main(int argc, char **argv)
 	//jrpc_register_procedure(&my_server, run_cmd, "GetCmdTop", "top -n 1 -b | head -n 50");
 	jrpc_register_procedure(&my_server, run_builtin_cmd, "GetCmdTop", "ps -e -o pid,user,pri,ni,vsize,rss,s,%cpu,%mem,time,cmd --sort=-%cpu ");
 	//jrpc_register_procedure(&my_server, run_cmd, "GetCmdTopH", "top -n 1 -b | head -n 50");
-	//jrpc_register_procedure(&my_server, run_cmd, "GetCmdIotop", "iotop -n 1 -b | head -n 50");
+	jrpc_register_procedure(&my_server, run_cmd, "GetCmdIotop", "iotop -n 1 -b | head -n 50");
+	jrpc_register_procedure(&my_server, run_cmd, "GetCmdJnettop", "jnettop --display text -t 5 --format '$src$,$srcname$,$srcport$,$srcbytes$,$srcpackets$,$srcbps$,$srcpps$,$dst$,$dstname$,$dstport$,$dstbytes$,$dstpackets$,$dstbps$,$dstpps$,$proto$,$totalbytes$,$totalpackets$,$totalbps$,$totalpps$,$filterdata$'");
 	//jrpc_register_procedure(&my_server, run_cmd, "GetCmdSmem", "smem -p -s pss -r -n 50");
 	jrpc_register_procedure(&my_server, run_builtin_cmd, "GetCmdDmesg", "dmesg");
 	jrpc_register_procedure(&my_server, run_builtin_cmd, "GetCmdDf", "df -h");