diff -ur ./DPDKORG/lib/librte_pmd_e1000/igb_rxtx.c ./DPDK/lib/librte_pmd_e1000/igb_rxtx.c
--- ./DPDKORG/lib/librte_pmd_e1000/igb_rxtx.c	2013-06-24 10:21:14.000000000 +1200
+++ ./DPDK/lib/librte_pmd_e1000/igb_rxtx.c	2013-07-12 17:02:02.000000000 +1200
@@ -1060,7 +1060,7 @@
  *      (num_ring_desc * sizeof(struct e1000_rx/tx_desc)) % 128 == 0
  */
 #define IGB_MIN_RING_DESC 32
-#define IGB_MAX_RING_DESC 4096
+#define IGB_MAX_RING_DESC 32768
 
 static const struct rte_memzone *
 ring_dma_zone_reserve(struct rte_eth_dev *dev, const char *ring_name,