diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 22f00a6..3560509 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -30,7 +30,8 @@
 #define TCP_MAX_OPTION_SPACE 40
 
 #define TCP_DUPACK_THRESHOLD 3
-#define TCP_DEFAULT_RX_FIFO_SIZE 64 << 10
+#define TCP_MAX_RX_FIFO_SIZE 2 << 20
+#define TCP_IW_N_SEGMENTS 10
 
 /** TCP FSM state definitions as per RFC793. */
 #define foreach_tcp_fsm_state   \
@@ -590,7 +591,6 @@
 /**
  * Push TCP header to buffer
  *
- * @param vm - vlib_main
  * @param b - buffer to write the header to
  * @param sp_net - source port net order
  * @param dp_net - destination port net order