Index: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
===================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
@@ -181,6 +181,7 @@
 #define HN_CSUM_ASSIST_WIN8	(CSUM_IP | CSUM_TCP)
 #define HN_CSUM_ASSIST		(CSUM_IP | CSUM_UDP | CSUM_TCP)
 
+#define HN_LRO_LENLIM_MULTIRX_DEF	(12 * ETHERMTU)
 #define HN_LRO_LENLIM_DEF		(25 * ETHERMTU)
 /* YYY 2*MTU is a bit rough, but should be good enough. */
 #define HN_LRO_LENLIM_MIN(ifp)		(2 * (ifp)->if_mtu)
@@ -530,6 +531,21 @@
 	device_printf(dev, "%d TX ring, %d RX ring\n",
 	    sc->hn_tx_ring_inuse, sc->hn_rx_ring_inuse);
 
+#if __FreeBSD_version >= 1100099
+	if (sc->hn_rx_ring_inuse > 1) {
+		int i;
+
+		/*
+		 * Reduce TCP segment aggregation limit for multiple
+		 * RX rings to increase ACK timeliness.
+		 */
+		for (i = 0; i < sc->hn_rx_ring_inuse; ++i) {
+			sc->hn_rx_ring[i].hn_lro.lro_length_lim =
+			    HN_LRO_LENLIM_MULTIRX_DEF;
+		}
+	}
+#endif
+
 	if (device_info.link_state == 0) {
 		sc->hn_carrier = 1;
 	}