Lowered recvmmsg queuelen excessive memory usage.

Change-Id: I8b934ca1f9cd0b80f7e1ede479674c269415f2da

src/common/queue.h

@@ -25,7 +25,7 @@
 #include <stdlib.h>
 #include <pthread.h>
 
-#define QUEUE_ELEMS 512
+#define QUEUE_ELEMS 32
 struct queue {
 	unsigned int head;
 	unsigned int prod_waiting;

src/knot/common.h

@@ -51,7 +51,7 @@ typedef unsigned int uint; /*!< \brief Unsigned. */
 #define DEFAULT_THR_COUNT 2  /*!< \brief Default thread count. */
 #define TCP_BACKLOG_SIZE 10   /*!< \brief TCP listen backlog size. */
 #define XFR_THREADS_COUNT 3  /*!< \brief Number of threads for XFR handler. */
-#define RECVMMSG_BATCHLEN 16 /*!< \brief Define for recvmmsg() batch size. */
+#define RECVMMSG_BATCHLEN 64 /*!< \brief Define for recvmmsg() batch size. */
 
 ///*! \brief If defined, the statistics module will be enabled. */
 //#define STAT_COMPILE