diff --git a/kernel/tests.c b/kernel/tests.c
index 837dad4b..68acd084 100644
--- a/kernel/tests.c
+++ b/kernel/tests.c
@@ -214,7 +214,7 @@ void* server_task(void* e)
 
     tmp1 = get_clock_tick();
 
-    for (n = 0; n < 1024 ; n++)
+    for (n = 0; n < 512 ; n++)
     {
         //if (!(n%10))
         kprintf("%d-",n);
diff --git a/lwip/src/include/lwipopts.h b/lwip/src/include/lwipopts.h
index 312de851..8e3c5645 100644
--- a/lwip/src/include/lwipopts.h
+++ b/lwip/src/include/lwipopts.h
@@ -99,5 +99,8 @@
 #define NETIF_DEBUG		LWIP_DBG_OFF
 #define TIMERS_DEBUG		LWIP_DBG_OFF
 
+#define LWIP_TCPIP_CORE_LOCKING_INPUT   1
+#define LWIP_TCPIP_CORE_LOCKING         1
+
 
 #endif