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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
@@ -136,6 +136,8 @@
#define HN_LROENT_CNT_DEF 128
+#define HN_RING_CNT_DEF_MAX 8
+
#define HN_RNDIS_MSG_LEN \
(sizeof(rndis_msg) + \
RNDIS_HASH_PPI_SIZE + \
@@ -460,8 +462,14 @@
* The # of RX rings to use is same as the # of channels to use.
*/
ring_cnt = hn_chan_cnt;
- if (ring_cnt <= 0 || ring_cnt > mp_ncpus)
+ if (ring_cnt <= 0) {
+ /* Default */
+ ring_cnt = mp_ncpus;
+ if (ring_cnt > HN_RING_CNT_DEF_MAX)
+ ring_cnt = HN_RING_CNT_DEF_MAX;
+ } else if (ring_cnt > mp_ncpus) {
ring_cnt = mp_ncpus;
+ }
tx_ring_cnt = hn_tx_ring_cnt;
if (tx_ring_cnt <= 0 || tx_ring_cnt > ring_cnt)

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