=== uipc_mbuf.c
==================================================================
--- uipc_mbuf.c	(revision 268358)
+++ uipc_mbuf.c	(local)
@@ -917,7 +917,15 @@
 		struct mbuf *n;
 
 		/* Get the next new mbuf */
-		if (remain >= MINCLSIZE) {
+		if (remain >= MJUM16BYTES) {
+			/*
+			 * By allocating a bigger mbuf, we get fewer
+			 * scatter gather entries for the hardware to
+			 * process:
+			 */
+			n = m_getjcl(how, m->m_type, 0, MJUM16BYTES);
+			nsize = MJUM16BYTES;
+		} else if (remain >= MINCLSIZE) {
 			n = m_getcl(how, m->m_type, 0);
 			nsize = MCLBYTES;
 		} else {