Index: ifq.c
===================================================================
RCS file: /cvs/src/sys/net/ifq.c,v
retrieving revision 1.34
diff -u -p -r1.34 ifq.c
--- ifq.c	16 Aug 2019 04:09:02 -0000	1.34
+++ ifq.c	7 Oct 2019 23:04:13 -0000
@@ -499,8 +499,12 @@ ifiq_destroy(struct ifiqueue *ifiq)
 	ml_purge(&ifiq->ifiq_ml);
 }
 
-unsigned int ifiq_pressure_drop = 8;
-unsigned int ifiq_pressure_return = 6;
+unsigned int ifiq_maxlen_drop = 2048 * 5;
+unsigned int ifiq_maxlen_return = 2048 * 3;
+
+/* pressure is a nop for 6.6-release */
+unsigned int ifiq_pressure_drop = 0;
+unsigned int ifiq_pressure_return = 0;
 
 int
 ifiq_input(struct ifiqueue *ifiq, struct mbuf_list *ml)
@@ -509,7 +513,7 @@ ifiq_input(struct ifiqueue *ifiq, struct
 	struct mbuf *m;
 	uint64_t packets;
 	uint64_t bytes = 0;
-	unsigned int pressure;
+	unsigned int len;
 #if NBPFILTER > 0
 	caddr_t if_bpf;
 #endif
@@ -553,8 +557,8 @@ ifiq_input(struct ifiqueue *ifiq, struct
 	ifiq->ifiq_packets += packets;
 	ifiq->ifiq_bytes += bytes;
 
-	pressure = ++ifiq->ifiq_pressure;
-	if (pressure > ifiq_pressure_drop)
+	len = ml_len(&ifiq->ifiq_ml);
+	if (len > ifiq_maxlen_drop)
 		ifiq->ifiq_qdrops += ml_len(ml);
 	else
 		ml_enlist(&ifiq->ifiq_ml, ml);
@@ -565,7 +569,7 @@ ifiq_input(struct ifiqueue *ifiq, struct
 	else
 		ml_purge(ml);
 
-	return (pressure > ifiq_pressure_return);
+	return (len > ifiq_maxlen_return);
 }
 
 void
@@ -600,7 +604,6 @@ ifiq_process(void *arg)
 		return;
 
 	mtx_enter(&ifiq->ifiq_mtx);
-	ifiq->ifiq_pressure = 0;
 	ml = ifiq->ifiq_ml;
 	ml_init(&ifiq->ifiq_ml);
 	mtx_leave(&ifiq->ifiq_mtx);
@@ -612,8 +615,10 @@ int
 net_ifiq_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 
     void *newp, size_t newlen)
 {
+	int error = EOPNOTSUPP;
+/* pressure is disabled for 6.6-release */
+#if 0
 	int val;
-	int error;
 
 	if (namelen != 1)
 		return (EISDIR);
@@ -641,6 +646,7 @@ net_ifiq_sysctl(int *name, u_int namelen
 		error = EOPNOTSUPP;
 		break;
 	}
+#endif
 
 	return (error);
 }