Index: if_em.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_em.c,v
retrieving revision 1.331
diff -u -p -r1.331 if_em.c
--- if_em.c	13 Apr 2016 10:34:32 -0000	1.331
+++ if_em.c	29 Aug 2016 23:52:07 -0000
@@ -2134,7 +2134,7 @@ em_setup_transmit_structures(struct em_s
 		pkt = &sc->sc_tx_pkts_ring[i];
 		error = bus_dmamap_create(sc->sc_dmat, MAX_JUMBO_FRAME_SIZE,
 		    EM_MAX_SCATTER / (sc->pcix_82544 ? 2 : 1),
-		    MAX_JUMBO_FRAME_SIZE, 0, BUS_DMA_NOWAIT, &pkt->pkt_map);
+		    MAX_JUMBO_FRAME_SIZE, 4096, BUS_DMA_NOWAIT, &pkt->pkt_map);
 		if (error != 0) {
 			printf("%s: Unable to create TX DMA map\n",
 			    DEVNAME(sc));