Index: if_em.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_em.c,v
retrieving revision 1.313
diff -u -p -r1.313 if_em.c
--- if_em.c	25 Nov 2015 03:09:59 -0000	1.313
+++ if_em.c	29 Dec 2015 06:07:53 -0000
@@ -2161,8 +2161,8 @@ em_setup_transmit_structures(struct em_s
 	tx_buffer = sc->tx_buffer_area;
 	for (i = 0; i < sc->num_tx_desc; i++) {
 		error = bus_dmamap_create(sc->txtag, MAX_JUMBO_FRAME_SIZE,
-			    EM_MAX_SCATTER, MAX_JUMBO_FRAME_SIZE, 0,
-			    BUS_DMA_NOWAIT, &tx_buffer->map);
+		    EM_MAX_SCATTER / (sc->pcix_82544 ? 2 : 1),
+		    MAX_JUMBO_FRAME_SIZE, 0, BUS_DMA_NOWAIT, &tx_buffer->map);
 		if (error != 0) {
 			printf("%s: Unable to create TX DMA map\n",
 			    sc->sc_dv.dv_xname);