--- //depot/vendor/freebsd/src/sys/netinet/udp_usrreq.c	2005/12/14 22:30:18
+++ //depot/projects/netsmp/src/sys/netinet/udp_usrreq.c	2006/01/01 16:05:22
@@ -1115,5 +1115,32 @@
 	.pru_send =		udp_send,
 	.pru_shutdown =		udp_shutdown,
 	.pru_sockaddr =		udp_sockaddr,
+	.pru_sosend =		sosend,
 	.pru_sosetlabel =	in_pcbsosetlabel
 };
+
+static int
+sysctl_net_inet_udp_sosend_dgram(SYSCTL_HANDLER_ARGS)
+{
+	int error, mode;
+
+	if (udp_usrreqs.pru_sosend == sosend_dgram)
+		mode = 1;
+	else
+		mode = 0;
+
+	error = sysctl_handle_int(oidp, &mode, 0, req);
+	if (error || !req->newptr)
+	        return (error);
+ 
+	if (mode)
+	        udp_usrreqs.pru_sosend = sosend_dgram;
+	else
+	        udp_usrreqs.pru_sosend = sosend;
+
+	return (0);
+}
+
+SYSCTL_PROC(_net_inet_udp, OID_AUTO, sosend_dgram, CTLTYPE_INT |
+    CTLFLAG_RW, 0, 0, sysctl_net_inet_udp_sosend_dgram, "I",
+    "Use optimized sosend_dgram instead of sosend for UDP");