Index: sys/kern/uipc_usrreq.c
===================================================================
--- sys/kern/uipc_usrreq.c
+++ sys/kern/uipc_usrreq.c
@@ -154,7 +154,7 @@
  * large enough for at least one max-size datagram plus address.
  */
 #ifndef PIPSIZ
-#define	PIPSIZ	8192
+#define	PIPSIZ	65536
 #endif
 static u_long	unpst_sendspace = PIPSIZ;
 static u_long	unpst_recvspace = PIPSIZ;