netmap: ring size limit not enough for multi-queue em(4)

Also mutes a spammy message.  Bravely going where no man
has gone before.  :)

sys/dev/netmap/netmap.c

@@ -2920,7 +2920,7 @@ netmap_transmit(struct ifnet *ifp, struct mbuf *m)
         if (space < 0)
                 space += kring->nkr_num_slots;
 	if (space + mbq_len(q) >= kring->nkr_num_slots - 1) { // XXX
-		RD(10, "%s full hwcur %d hwtail %d qlen %d len %d m %p",
+		NRD(10, "%s full hwcur %d hwtail %d qlen %d len %d m %p",
 			na->name, kring->nr_hwcur, kring->nr_hwtail, mbq_len(q),
 			len, m);
 	} else {

sys/dev/netmap/netmap_kern.h

@@ -182,6 +182,7 @@ struct hrtimer {
 	} while (0)
 
 /* rate limited, lps indicates how many per second */
+#define NRD(lps, format, ...)
 #define RD(lps, format, ...)					\
 	do {							\
 		static int t0, __cnt;				\

sys/dev/netmap/netmap_mem2.c

@@ -282,7 +282,7 @@ struct netmap_obj_params netmap_params[NETMAP_POOLS_NR] = {
 		.num  = 100,
 	},
 	[NETMAP_RING_POOL] = {
-		.size = 9*PAGE_SIZE,
+		.size = 18*PAGE_SIZE,
 		.num  = 200,
 	},
 	[NETMAP_BUF_POOL] = {