Index: sys/net/iflib.c
===================================================================
--- sys/net/iflib.c
+++ sys/net/iflib.c
@@ -3412,6 +3412,7 @@
 	struct ifnet *ifp = ctx->ifc_ifp;
 	struct mbuf **mp, *m;
 	int i, count, consumed, pkt_sent, bytes_sent, mcast_sent, avail;
+	int max_bytes;
 	int reclaimed, err, in_use_prev, desc_used;
 	bool do_prefetch, ring, rang;
 
@@ -3444,7 +3445,8 @@
 	if (reclaimed)
 		txq->ift_qstatus = IFLIB_QUEUE_IDLE;
 	consumed = mcast_sent = bytes_sent = pkt_sent = 0;
-	count = MIN(avail, TX_BATCH_SIZE);
+	count = avail;
+	max_bytes = min(TX_BATCH_SIZE * if_getmtu(ifp), ctx->ifc_softc_ctx.isc_txrx_budget_bytes_max);
 #ifdef INVARIANTS
 	if (iflib_verbose_debug)
 		printf("%s avail=%d ifc_flags=%x txq_avail=%d ", __FUNCTION__,
@@ -3453,7 +3455,7 @@
 	do_prefetch = (ctx->ifc_flags & IFC_PREFETCH);
 	avail = TXQ_AVAIL(txq);
 	err = 0;
-	for (desc_used = i = 0; i < count && avail > MAX_TX_DESC(ctx) + 2; i++) {
+	for (desc_used = i = 0; i < count && avail > MAX_TX_DESC(ctx) + 2 && bytes_sent < max_bytes; i++) {
 		int rem = do_prefetch ? count - i : 0;
 
 		mp = _ring_peek_one(r, cidx, i, rem);