Add new tunable 'net.link.ifqmaxlen' to set default send interface

queue length. The default value for this parameter is 50, which is
quite low for many of today's uses and the only way to modify this
parameter right now is to edit if_var.h file. Also add read-only
sysctl with the same name, so that it's possible to retrieve the
current value.

MFC after:	1 month

63 files changed, 103 insertions, 99 deletions

diff --git a/sys/arm/at91/if_ate.c b/sys/arm/at91/if_ate.c
index 2f6b741..b065482 100644
--- a/sys/arm/at91/if_ate.c
+++ b/sys/arm/at91/if_ate.c
@@ -272,8 +272,8 @@ ate_attach(device_t dev)
 	ifp->if_ioctl = ateioctl;
 	ifp->if_init = ateinit;
 	ifp->if_baudrate = 10000000;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 	ifp->if_linkmib = &sc->mibdata;
 	ifp->if_linkmiblen = sizeof(sc->mibdata);
diff --git a/sys/arm/xscale/ixp425/if_npe.c b/sys/arm/xscale/ixp425/if_npe.c
index 5b605ae..3d8d670 100644
--- a/sys/arm/xscale/ixp425/if_npe.c
+++ b/sys/arm/xscale/ixp425/if_npe.c
@@ -360,7 +360,7 @@ npe_attach(device_t dev)
 	ifp->if_ioctl = npeioctl;
 	ifp->if_init = npeinit;
 	IFQ_SET_MAXLEN(&ifp->if_snd, sc->txdma.nbuf - 1);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 	ifp->if_linkmib = &sc->mibdata;
 	ifp->if_linkmiblen = sizeof(sc->mibdata);
diff --git a/sys/dev/ae/if_ae.c b/sys/dev/ae/if_ae.c
index 68181f4..d2812a4 100644
--- a/sys/dev/ae/if_ae.c
+++ b/sys/dev/ae/if_ae.c
@@ -378,7 +378,7 @@ ae_attach(device_t dev)
 	ifp->if_init = ae_init;
 	ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_VLAN_HWTAGGING;
 	ifp->if_hwassist = 0;
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_MAXLEN(&ifp->if_snd, ifp->if_snd.ifq_drv_maxlen);
 	IFQ_SET_READY(&ifp->if_snd);
 	if (pci_find_extcap(dev, PCIY_PMG, &pmc) == 0) {
diff --git a/sys/dev/an/if_an.c b/sys/dev/an/if_an.c
index 6d9ef96..645fe41 100644
--- a/sys/dev/an/if_an.c
+++ b/sys/dev/an/if_an.c
@@ -767,8 +767,8 @@ an_attach(struct an_softc *sc, int flags)
 	ifp->if_start = an_start;
 	ifp->if_init = an_init;
 	ifp->if_baudrate = 10000000;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	bzero(sc->an_config.an_nodename, sizeof(sc->an_config.an_nodename));
diff --git a/sys/dev/ath/if_ath.c b/sys/dev/ath/if_ath.c
index 5847489..15765f2 100644
--- a/sys/dev/ath/if_ath.c
+++ b/sys/dev/ath/if_ath.c
@@ -562,8 +562,8 @@ ath_attach(u_int16_t devid, struct ath_softc *sc)
 	ifp->if_start = ath_start;
 	ifp->if_ioctl = ath_ioctl;
 	ifp->if_init = ath_init;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/bwi/if_bwi.c b/sys/dev/bwi/if_bwi.c
index 96c5cc6..724778d 100644
--- a/sys/dev/bwi/if_bwi.c
+++ b/sys/dev/bwi/if_bwi.c
@@ -461,8 +461,8 @@ bwi_attach(struct bwi_softc *sc)
 	ifp->if_init = bwi_init;
 	ifp->if_ioctl = bwi_ioctl;
 	ifp->if_start = bwi_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 	callout_init_mtx(&sc->sc_watchdog_timer, &sc->sc_mtx, 0);
 
diff --git a/sys/dev/bwn/if_bwn.c b/sys/dev/bwn/if_bwn.c
index 5ca5098..fd36403 100644
--- a/sys/dev/bwn/if_bwn.c
+++ b/sys/dev/bwn/if_bwn.c
@@ -1193,8 +1193,8 @@ bwn_attach_pre(struct bwn_softc *sc)
 	ifp->if_init = bwn_init;
 	ifp->if_ioctl = bwn_ioctl;
 	ifp->if_start = bwn_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	return (0);
diff --git a/sys/dev/ce/if_ce.c b/sys/dev/ce/if_ce.c
index f04fd09..d151b42 100644
--- a/sys/dev/ce/if_ce.c
+++ b/sys/dev/ce/if_ce.c
@@ -701,9 +701,9 @@ static int ce_attach (device_t dev)
 #endif
 			continue;
 		}
-		d->queue.ifq_maxlen	= IFQ_MAXLEN;
-		d->hi_queue.ifq_maxlen	= IFQ_MAXLEN;
-		d->rqueue.ifq_maxlen	= IFQ_MAXLEN;
+		d->queue.ifq_maxlen	= ifqmaxlen;
+		d->hi_queue.ifq_maxlen	= ifqmaxlen;
+		d->rqueue.ifq_maxlen	= ifqmaxlen;
 #if __FreeBSD_version >= 500000
 		mtx_init (&d->queue.ifq_mtx, "ce_queue", NULL, MTX_DEF);
 		mtx_init (&d->hi_queue.ifq_mtx, "ce_queue_hi", NULL, MTX_DEF);
@@ -732,7 +732,7 @@ static int ce_attach (device_t dev)
 		d->ifp->if_ioctl	= ce_sioctl;
 		d->ifp->if_start	= ce_ifstart;
 		d->ifp->if_init		= ce_initialize;
-		d->rqueue.ifq_maxlen	= IFQ_MAXLEN;
+		d->rqueue.ifq_maxlen	= ifqmaxlen;
 #if __FreeBSD_version >= 500000
 		mtx_init (&d->rqueue.ifq_mtx, "ce_rqueue", NULL, MTX_DEF);
 #endif		
diff --git a/sys/dev/cm/smc90cx6.c b/sys/dev/cm/smc90cx6.c
index 0e9015e..719e468 100644
--- a/sys/dev/cm/smc90cx6.c
+++ b/sys/dev/cm/smc90cx6.c
@@ -189,7 +189,7 @@ cm_attach(dev)
 	ifp->if_ioctl = cm_ioctl;
 	ifp->if_init = cm_init;
 	/* XXX IFQ_SET_READY(&ifp->if_snd); */
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX;
 
 	arc_ifattach(ifp, linkaddress);
diff --git a/sys/dev/cp/if_cp.c b/sys/dev/cp/if_cp.c
index f6eeed5..e640230 100644
--- a/sys/dev/cp/if_cp.c
+++ b/sys/dev/cp/if_cp.c
@@ -505,8 +505,8 @@ static int cp_attach (device_t dev)
 			NG_NODE_UNREF (d->node);
 			continue;
 		}
-		d->queue.ifq_maxlen = IFQ_MAXLEN;
-		d->hi_queue.ifq_maxlen = IFQ_MAXLEN;
+		d->queue.ifq_maxlen = ifqmaxlen;
+		d->hi_queue.ifq_maxlen = ifqmaxlen;
 		mtx_init (&d->queue.ifq_mtx, "cp_queue", NULL, MTX_DEF);
 		mtx_init (&d->hi_queue.ifq_mtx, "cp_queue_hi", NULL, MTX_DEF);
 #else /*NETGRAPH*/
diff --git a/sys/dev/cs/if_cs.c b/sys/dev/cs/if_cs.c
index b32a03d..476b9dd 100644
--- a/sys/dev/cs/if_cs.c
+++ b/sys/dev/cs/if_cs.c
@@ -500,7 +500,7 @@ cs_attach(device_t dev)
 	ifp->if_start=cs_start;
 	ifp->if_ioctl=cs_ioctl;
 	ifp->if_init=cs_init;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 
 	ifp->if_flags=(IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
 
diff --git a/sys/dev/ctau/if_ct.c b/sys/dev/ctau/if_ct.c
index 125dfa5..dbdca97 100644
--- a/sys/dev/ctau/if_ct.c
+++ b/sys/dev/ctau/if_ct.c
@@ -722,8 +722,8 @@ static int ct_attach (device_t dev)
 			ct_bus_dma_mem_free (&d->dmamem);
 			continue;
 		}
-		d->queue.ifq_maxlen = IFQ_MAXLEN;
-		d->hi_queue.ifq_maxlen = IFQ_MAXLEN;
+		d->queue.ifq_maxlen = ifqmaxlen;
+		d->hi_queue.ifq_maxlen = ifqmaxlen;
 		mtx_init (&d->queue.ifq_mtx, "ct_queue", NULL, MTX_DEF);
 		mtx_init (&d->hi_queue.ifq_mtx, "ct_queue_hi", NULL, MTX_DEF);
 #else /*NETGRAPH*/
diff --git a/sys/dev/cx/if_cx.c b/sys/dev/cx/if_cx.c
index 4e9750e..c8f53a0 100644
--- a/sys/dev/cx/if_cx.c
+++ b/sys/dev/cx/if_cx.c
@@ -831,8 +831,8 @@ static int cx_attach (device_t dev)
 			cx_bus_dma_mem_free (&d->dmamem);
 			continue;
 		}
-		d->lo_queue.ifq_maxlen = IFQ_MAXLEN;
-		d->hi_queue.ifq_maxlen = IFQ_MAXLEN;
+		d->lo_queue.ifq_maxlen = ifqmaxlen;
+		d->hi_queue.ifq_maxlen = ifqmaxlen;
 		mtx_init (&d->lo_queue.ifq_mtx, "cx_queue_lo", NULL, MTX_DEF);
 		mtx_init (&d->hi_queue.ifq_mtx, "cx_queue_hi", NULL, MTX_DEF);
 #else /*NETGRAPH*/
diff --git a/sys/dev/cxgb/cxgb_main.c b/sys/dev/cxgb/cxgb_main.c
index a47284f..a805b5d 100644
--- a/sys/dev/cxgb/cxgb_main.c
+++ b/sys/dev/cxgb/cxgb_main.c
@@ -1012,7 +1012,7 @@ cxgb_port_attach(device_t dev)
 	ifp->if_ioctl = cxgb_ioctl;
 	ifp->if_start = cxgb_start;
 
-	ifp->if_snd.ifq_drv_maxlen = cxgb_snd_queue_len;
+	ifp->if_snd.ifq_drv_maxlen = max(cxgb_snd_queue_len, ifqmaxlen);
 	IFQ_SET_MAXLEN(&ifp->if_snd, ifp->if_snd.ifq_drv_maxlen);
 	IFQ_SET_READY(&ifp->if_snd);
 
diff --git a/sys/dev/ed/if_ed.c b/sys/dev/ed/if_ed.c
index e065a67..839e2a5 100644
--- a/sys/dev/ed/if_ed.c
+++ b/sys/dev/ed/if_ed.c
@@ -283,8 +283,8 @@ ed_attach(device_t dev)
 	ifp->if_start = ed_start;
 	ifp->if_ioctl = ed_ioctl;
 	ifp->if_init = ed_init;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 	ifp->if_linkmib = &sc->mibdata;
 	ifp->if_linkmiblen = sizeof sc->mibdata;
diff --git a/sys/dev/ep/if_ep.c b/sys/dev/ep/if_ep.c
index 59dd1c4..2436255 100644
--- a/sys/dev/ep/if_ep.c
+++ b/sys/dev/ep/if_ep.c
@@ -306,8 +306,8 @@ ep_attach(struct ep_softc *sc)
 	ifp->if_start = epstart;
 	ifp->if_ioctl = epioctl;
 	ifp->if_init = epinit;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	callout_init_mtx(&sc->watchdog_timer, &sc->sc_mtx, 0);
diff --git a/sys/dev/ex/if_ex.c b/sys/dev/ex/if_ex.c
index d9e0c98..efd54bc 100644
--- a/sys/dev/ex/if_ex.c
+++ b/sys/dev/ex/if_ex.c
@@ -237,7 +237,7 @@ ex_attach(device_t dev)
 	ifp->if_start = ex_start;
 	ifp->if_ioctl = ex_ioctl;
 	ifp->if_init = ex_init;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 
 	ifmedia_init(&sc->ifmedia, 0, ex_ifmedia_upd, ex_ifmedia_sts);
 	mtx_init(&sc->lock, device_get_nameunit(dev), MTX_NETWORK_LOCK,
diff --git a/sys/dev/fe/if_fe.c b/sys/dev/fe/if_fe.c
index eff92b7..9fe1f2c 100644
--- a/sys/dev/fe/if_fe.c
+++ b/sys/dev/fe/if_fe.c
@@ -766,7 +766,7 @@ fe_attach (device_t dev)
 	 * Set fixed interface flags.
 	 */
  	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 
 #if FE_SINGLE_TRANSMISSION
 	/* Override txb config to allocate minimum.  */
diff --git a/sys/dev/ie/if_ie.c b/sys/dev/ie/if_ie.c
index 34c658e..172bf9e 100644
--- a/sys/dev/ie/if_ie.c
+++ b/sys/dev/ie/if_ie.c
@@ -318,7 +318,7 @@ ie_attach(device_t dev)
 	ifp->if_start = iestart;
 	ifp->if_ioctl = ieioctl;
 	ifp->if_init = ieinit;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 
 	ether_ifattach(ifp, sc->enaddr);
 
diff --git a/sys/dev/iicbus/if_ic.c b/sys/dev/iicbus/if_ic.c
index bb5186c..4a05b16 100644
--- a/sys/dev/iicbus/if_ic.c
+++ b/sys/dev/iicbus/if_ic.c
@@ -181,7 +181,7 @@ icattach(device_t dev)
 	ifp->if_output = icoutput;
 	ifp->if_hdrlen = 0;
 	ifp->if_addrlen = 0;
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 
 	ic_alloc_buffers(sc, ICMTU);
 
diff --git a/sys/dev/ipw/if_ipw.c b/sys/dev/ipw/if_ipw.c
index 3315d65..2329c33 100644
--- a/sys/dev/ipw/if_ipw.c
+++ b/sys/dev/ipw/if_ipw.c
@@ -289,8 +289,8 @@ ipw_attach(device_t dev)
 	ifp->if_init = ipw_init;
 	ifp->if_ioctl = ipw_ioctl;
 	ifp->if_start = ipw_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/iwi/if_iwi.c b/sys/dev/iwi/if_iwi.c
index 1105425..4b765ef 100644
--- a/sys/dev/iwi/if_iwi.c
+++ b/sys/dev/iwi/if_iwi.c
@@ -363,8 +363,8 @@ iwi_attach(device_t dev)
 	ifp->if_init = iwi_init;
 	ifp->if_ioctl = iwi_ioctl;
 	ifp->if_start = iwi_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/iwn/if_iwn.c b/sys/dev/iwn/if_iwn.c
index 09c1efd..5a17d1e 100644
--- a/sys/dev/iwn/if_iwn.c
+++ b/sys/dev/iwn/if_iwn.c
@@ -627,8 +627,8 @@ iwn_attach(device_t dev)
 	ifp->if_init = iwn_init;
 	ifp->if_ioctl = iwn_ioctl;
 	ifp->if_start = iwn_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ieee80211_ifattach(ic, macaddr);
diff --git a/sys/dev/le/lance.c b/sys/dev/le/lance.c
index db20099..8700aa2 100644
--- a/sys/dev/le/lance.c
+++ b/sys/dev/le/lance.c
@@ -133,8 +133,8 @@ lance_config(struct lance_softc *sc, const char* name, int unit)
 	ifp->if_flags &= ~IFF_MULTICAST;
 #endif
 	ifp->if_baudrate = IF_Mbps(10);
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	/* Initialize ifmedia structures. */
diff --git a/sys/dev/malo/if_malo.c b/sys/dev/malo/if_malo.c
index 57e0d3d..ae6ef88 100644
--- a/sys/dev/malo/if_malo.c
+++ b/sys/dev/malo/if_malo.c
@@ -275,8 +275,8 @@ malo_attach(uint16_t devid, struct malo_softc *sc)
 	ifp->if_start = malo_start;
 	ifp->if_ioctl = malo_ioctl;
 	ifp->if_init = malo_init;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/mwl/if_mwl.c b/sys/dev/mwl/if_mwl.c
index e4e469b..662f201 100644
--- a/sys/dev/mwl/if_mwl.c
+++ b/sys/dev/mwl/if_mwl.c
@@ -404,8 +404,8 @@ mwl_attach(uint16_t devid, struct mwl_softc *sc)
 	ifp->if_start = mwl_start;
 	ifp->if_ioctl = mwl_ioctl;
 	ifp->if_init = mwl_init;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/my/if_my.c b/sys/dev/my/if_my.c
index 99f6071..951473a 100644
--- a/sys/dev/my/if_my.c
+++ b/sys/dev/my/if_my.c
@@ -902,8 +902,8 @@ my_attach(device_t dev)
 	ifp->if_start = my_start;
 	ifp->if_init = my_init;
 	ifp->if_baudrate = 10000000;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	if (sc->my_info->my_did == MTD803ID)
diff --git a/sys/dev/nxge/if_nxge.c b/sys/dev/nxge/if_nxge.c
index c86d7b6..0e67413 100644
--- a/sys/dev/nxge/if_nxge.c
+++ b/sys/dev/nxge/if_nxge.c
@@ -1190,7 +1190,7 @@ xge_interface_setup(device_t dev)
 	ifnetp->if_start    = xge_send;
 
 	/* TODO: Check and assign optimal value */
-	ifnetp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifnetp->if_snd.ifq_maxlen = ifqmaxlen;
 
 	ifnetp->if_capabilities = IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU |
 	    IFCAP_HWCSUM;
diff --git a/sys/dev/pdq/pdq_ifsubr.c b/sys/dev/pdq/pdq_ifsubr.c
index ec14150..4df0082 100644
--- a/sys/dev/pdq/pdq_ifsubr.c
+++ b/sys/dev/pdq/pdq_ifsubr.c
@@ -471,7 +471,7 @@ pdq_ifattach(pdq_softc_t *sc, const pdq_uint8_t *llc, pdq_type_t type)
     if_initname(ifp, device_get_name(sc->dev), device_get_unit(sc->dev));
     ifp->if_softc = sc;
     ifp->if_init = pdq_ifinit;
-    ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+    ifp->if_snd.ifq_maxlen = ifqmaxlen;
     ifp->if_flags = IFF_BROADCAST|IFF_SIMPLEX|IFF_NOTRAILERS|IFF_MULTICAST;
 
     ifp->if_ioctl = pdq_ifioctl;
diff --git a/sys/dev/ppbus/if_plip.c b/sys/dev/ppbus/if_plip.c
index 3e4c1ca..fc81aec 100644
--- a/sys/dev/ppbus/if_plip.c
+++ b/sys/dev/ppbus/if_plip.c
@@ -262,7 +262,7 @@ lp_attach(device_t dev)
 	ifp->if_output = lpoutput;
 	ifp->if_hdrlen = 0;
 	ifp->if_addrlen = 0;
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	if_attach(ifp);
 
 	bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
diff --git a/sys/dev/ral/rt2560.c b/sys/dev/ral/rt2560.c
index 9549107..8589768 100644
--- a/sys/dev/ral/rt2560.c
+++ b/sys/dev/ral/rt2560.c
@@ -267,8 +267,8 @@ rt2560_attach(device_t dev, int id)
 	ifp->if_init = rt2560_init;
 	ifp->if_ioctl = rt2560_ioctl;
 	ifp->if_start = rt2560_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/ral/rt2661.c b/sys/dev/ral/rt2661.c
index 9bc8838..9b77c23 100644
--- a/sys/dev/ral/rt2661.c
+++ b/sys/dev/ral/rt2661.c
@@ -269,8 +269,8 @@ rt2661_attach(device_t dev, int id)
 	ifp->if_init = rt2661_init;
 	ifp->if_ioctl = rt2661_ioctl;
 	ifp->if_start = rt2661_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/sbni/if_sbni.c b/sys/dev/sbni/if_sbni.c
index 8c8687c..7ca46d3 100644
--- a/sys/dev/sbni/if_sbni.c
+++ b/sys/dev/sbni/if_sbni.c
@@ -235,7 +235,7 @@ sbni_attach(struct sbni_softc *sc, int unit, struct sbni_flags flags)
 	ifp->if_init	= sbni_init;
 	ifp->if_start	= sbni_start;
 	ifp->if_ioctl	= sbni_ioctl;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 
 	/* report real baud rate */
 	csr0 = sbni_inb(sc, CSR0);
diff --git a/sys/dev/smc/if_smc.c b/sys/dev/smc/if_smc.c
index f7f5407..6d9ba59 100644
--- a/sys/dev/smc/if_smc.c
+++ b/sys/dev/smc/if_smc.c
@@ -347,7 +347,7 @@ smc_attach(device_t dev)
 	ifp->if_init = smc_init;
 	ifp->if_ioctl = smc_ioctl;
 	ifp->if_start = smc_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ifp->if_capabilities = ifp->if_capenable = 0;
diff --git a/sys/dev/sn/if_sn.c b/sys/dev/sn/if_sn.c
index 217d811..0f86f92 100644
--- a/sys/dev/sn/if_sn.c
+++ b/sys/dev/sn/if_sn.c
@@ -207,8 +207,8 @@ sn_attach(device_t dev)
 	ifp->if_ioctl = snioctl;
 	ifp->if_init = sninit;
 	ifp->if_baudrate = 10000000;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ether_ifattach(ifp, eaddr);
diff --git a/sys/dev/snc/dp83932.c b/sys/dev/snc/dp83932.c
index c659c82..0b62053 100644
--- a/sys/dev/snc/dp83932.c
+++ b/sys/dev/snc/dp83932.c
@@ -177,7 +177,7 @@ sncconfig(sc, media, nmedia, defmedia, myea)
 	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
         ifp->if_init = sncinit;
         ifp->if_mtu = ETHERMTU;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 
 	/* Initialize media goo. */
 	ifmedia_init(&sc->sc_media, 0, snc_mediachange,
diff --git a/sys/dev/usb/net/uhso.c b/sys/dev/usb/net/uhso.c
index a810ec4..21a23c9 100644
--- a/sys/dev/usb/net/uhso.c
+++ b/sys/dev/usb/net/uhso.c
@@ -1471,8 +1471,8 @@ static int uhso_attach_ifnet(struct uhso_softc *sc, struct usb_interface *iface,
 	ifp->if_output = uhso_if_output;
 	ifp->if_flags = 0;
 	ifp->if_softc = sc;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	if_attach(ifp);
diff --git a/sys/dev/usb/net/usb_ethernet.c b/sys/dev/usb/net/usb_ethernet.c
index 6cf4460..bd75cef 100644
--- a/sys/dev/usb/net/usb_ethernet.c
+++ b/sys/dev/usb/net/usb_ethernet.c
@@ -214,8 +214,8 @@ ue_attach_post_task(struct usb_proc_msg *_task)
 		ifp->if_ioctl = uether_ioctl;
 	ifp->if_start = ue_start;
 	ifp->if_init = ue_init;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 	ue->ue_ifp = ifp;
 
diff --git a/sys/dev/usb/wlan/if_rum.c b/sys/dev/usb/wlan/if_rum.c
index 4a5fbae..155b767 100644
--- a/sys/dev/usb/wlan/if_rum.c
+++ b/sys/dev/usb/wlan/if_rum.c
@@ -478,8 +478,8 @@ rum_attach(device_t self)
 	ifp->if_init = rum_init;
 	ifp->if_ioctl = rum_ioctl;
 	ifp->if_start = rum_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/usb/wlan/if_run.c b/sys/dev/usb/wlan/if_run.c
index 3ab607f..c798c32 100644
--- a/sys/dev/usb/wlan/if_run.c
+++ b/sys/dev/usb/wlan/if_run.c
@@ -609,8 +609,8 @@ run_attach(device_t self)
 	ifp->if_init = run_init;
 	ifp->if_ioctl = run_ioctl;
 	ifp->if_start = run_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/usb/wlan/if_uath.c b/sys/dev/usb/wlan/if_uath.c
index 7838d5a..40b7c83 100644
--- a/sys/dev/usb/wlan/if_uath.c
+++ b/sys/dev/usb/wlan/if_uath.c
@@ -438,8 +438,8 @@ uath_attach(device_t dev)
 	ifp->if_ioctl = uath_ioctl;
 	ifp->if_start = uath_start;
 	/* XXX UATH_TX_DATA_LIST_COUNT */
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic = ifp->if_l2com;
diff --git a/sys/dev/usb/wlan/if_upgt.c b/sys/dev/usb/wlan/if_upgt.c
index 20f06c6..091b9df 100644
--- a/sys/dev/usb/wlan/if_upgt.c
+++ b/sys/dev/usb/wlan/if_upgt.c
@@ -331,7 +331,7 @@ upgt_attach(device_t dev)
 	ifp->if_init = upgt_init;
 	ifp->if_ioctl = upgt_ioctl;
 	ifp->if_start = upgt_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic = ifp->if_l2com;
diff --git a/sys/dev/usb/wlan/if_ural.c b/sys/dev/usb/wlan/if_ural.c
index 4a4378b..6839bcf 100644
--- a/sys/dev/usb/wlan/if_ural.c
+++ b/sys/dev/usb/wlan/if_ural.c
@@ -467,8 +467,8 @@ ural_attach(device_t self)
 	ifp->if_init = ural_init;
 	ifp->if_ioctl = ural_ioctl;
 	ifp->if_start = ural_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/usb/wlan/if_urtw.c b/sys/dev/usb/wlan/if_urtw.c
index 6604268..9ff16f3 100644
--- a/sys/dev/usb/wlan/if_urtw.c
+++ b/sys/dev/usb/wlan/if_urtw.c
@@ -867,8 +867,8 @@ urtw_attach(device_t dev)
 	ifp->if_ioctl = urtw_ioctl;
 	ifp->if_start = urtw_start;
 	/* XXX URTW_TX_DATA_LIST_COUNT */
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic = ifp->if_l2com;
diff --git a/sys/dev/usb/wlan/if_zyd.c b/sys/dev/usb/wlan/if_zyd.c
index a0b8179..1a298f8 100644
--- a/sys/dev/usb/wlan/if_zyd.c
+++ b/sys/dev/usb/wlan/if_zyd.c
@@ -381,7 +381,7 @@ zyd_attach(device_t dev)
 	ifp->if_init = zyd_init;
 	ifp->if_ioctl = zyd_ioctl;
 	ifp->if_start = zyd_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic = ifp->if_l2com;
diff --git a/sys/dev/vx/if_vx.c b/sys/dev/vx/if_vx.c
index 0dea9bf..1ea0faf 100644
--- a/sys/dev/vx/if_vx.c
+++ b/sys/dev/vx/if_vx.c
@@ -189,7 +189,7 @@ vx_attach(device_t dev)
 	}
 
 	ifp->if_mtu = ETHERMTU;
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 	ifp->if_start = vx_start;
 	ifp->if_ioctl = vx_ioctl;
diff --git a/sys/dev/wi/if_wi.c b/sys/dev/wi/if_wi.c
index 616c5d7..fe0d903 100644
--- a/sys/dev/wi/if_wi.c
+++ b/sys/dev/wi/if_wi.c
@@ -333,8 +333,8 @@ wi_attach(device_t dev)
 	ifp->if_ioctl = wi_ioctl;
 	ifp->if_start = wi_start;
 	ifp->if_init = wi_init;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ic->ic_ifp = ifp;
diff --git a/sys/dev/wl/if_wl.c b/sys/dev/wl/if_wl.c
index ed291ed..a95997e 100644
--- a/sys/dev/wl/if_wl.c
+++ b/sys/dev/wl/if_wl.c
@@ -559,7 +559,7 @@ wlattach(device_t device)
     ifp->if_init = wlinit;
     ifp->if_start = wlstart;
     ifp->if_ioctl = wlioctl;
-    ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+    ifp->if_snd.ifq_maxlen = ifqmaxlen;
     /* no entries
        ifp->if_done
        ifp->if_reset
diff --git a/sys/dev/wpi/if_wpi.c b/sys/dev/wpi/if_wpi.c
index 9bf9342..f6edc91 100644
--- a/sys/dev/wpi/if_wpi.c
+++ b/sys/dev/wpi/if_wpi.c
@@ -661,8 +661,8 @@ wpi_attach(device_t dev)
 	ifp->if_init = wpi_init;
 	ifp->if_ioctl = wpi_ioctl;
 	ifp->if_start = wpi_start;
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ieee80211_ifattach(ic, macaddr);
diff --git a/sys/dev/xe/if_xe.c b/sys/dev/xe/if_xe.c
index f18fd98..77b953a 100644
--- a/sys/dev/xe/if_xe.c
+++ b/sys/dev/xe/if_xe.c
@@ -254,7 +254,7 @@ xe_attach(device_t dev)
 	scp->ifp->if_ioctl = xe_ioctl;
 	scp->ifp->if_init = xe_init;
 	scp->ifp->if_baudrate = 100000000;
-	IFQ_SET_MAXLEN(&scp->ifp->if_snd, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&scp->ifp->if_snd, ifqmaxlen);
 
 	/* Initialise the ifmedia structure */
 	ifmedia_init(scp->ifm, 0, xe_media_change, xe_media_status);
diff --git a/sys/mips/adm5120/if_admsw.c b/sys/mips/adm5120/if_admsw.c
index 164e840..472a804 100644
--- a/sys/mips/adm5120/if_admsw.c
+++ b/sys/mips/adm5120/if_admsw.c
@@ -540,8 +540,8 @@ admsw_attach(device_t dev)
 		ifp->if_init = admsw_init;
 		ifp->if_mtu = ETHERMTU;
 		ifp->if_baudrate = IF_Mbps(100);
-		IFQ_SET_MAXLEN(&ifp->if_snd, max(ADMSW_NTXLDESC, IFQ_MAXLEN));
-		ifp->if_snd.ifq_drv_maxlen = max(ADMSW_NTXLDESC, IFQ_MAXLEN);
+		IFQ_SET_MAXLEN(&ifp->if_snd, max(ADMSW_NTXLDESC, ifqmaxlen));
+		ifp->if_snd.ifq_drv_maxlen = max(ADMSW_NTXLDESC, ifqmaxlen);
 		IFQ_SET_READY(&ifp->if_snd);
 		ifp->if_capabilities |= IFCAP_VLAN_MTU;
 
diff --git a/sys/mips/atheros/if_arge.c b/sys/mips/atheros/if_arge.c
index 4367bfb..eef1dcf 100644
--- a/sys/mips/atheros/if_arge.c
+++ b/sys/mips/atheros/if_arge.c
@@ -312,8 +312,8 @@ arge_attach(device_t dev)
 	sc->arge_if_flags = ifp->if_flags;
 
 	/* XXX: add real size */
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	ifp->if_capenable = ifp->if_capabilities;
diff --git a/sys/net/if.c b/sys/net/if.c
index 1acfb24..780f2c2 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -104,6 +104,10 @@ struct ifindex_entry {
 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
 
+TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen);
+SYSCTL_UINT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN,
+    &ifqmaxlen, 0, "max send queue size");
+
 /* Log link state change events */
 static int log_link_state_change = 1;
 
diff --git a/sys/net/if_ef.c b/sys/net/if_ef.c
index 94fb03d..61f7cb7 100644
--- a/sys/net/if_ef.c
+++ b/sys/net/if_ef.c
@@ -129,7 +129,7 @@ ef_attach(struct efnet *sc)
 
 	ifp->if_start = ef_start;
 	ifp->if_init = ef_init;
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
 	/*
 	 * Attach the interface
diff --git a/sys/net/if_gif.c b/sys/net/if_gif.c
index ae0ff4e..7683839 100644
--- a/sys/net/if_gif.c
+++ b/sys/net/if_gif.c
@@ -185,7 +185,7 @@ gif_clone_create(ifc, unit, params)
 	GIF2IFP(sc)->if_ioctl  = gif_ioctl;
 	GIF2IFP(sc)->if_start  = gif_start;
 	GIF2IFP(sc)->if_output = gif_output;
-	GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	GIF2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen;
 	if_attach(GIF2IFP(sc));
 	bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
 	if (ng_gif_attach_p != NULL)
diff --git a/sys/net/if_gre.c b/sys/net/if_gre.c
index bac3d795..1f1e108 100644
--- a/sys/net/if_gre.c
+++ b/sys/net/if_gre.c
@@ -184,7 +184,7 @@ gre_clone_create(ifc, unit, params)
 	GRE2IFP(sc)->if_softc = sc;
 	if_initname(GRE2IFP(sc), ifc->ifc_name, unit);
 
-	GRE2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	GRE2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen;
 	GRE2IFP(sc)->if_addrlen = 0;
 	GRE2IFP(sc)->if_hdrlen = 24; /* IP + GRE */
 	GRE2IFP(sc)->if_mtu = GREMTU;
diff --git a/sys/net/if_stf.c b/sys/net/if_stf.c
index 5c082c4..1ef5581 100644
--- a/sys/net/if_stf.c
+++ b/sys/net/if_stf.c
@@ -252,7 +252,7 @@ stf_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
 	ifp->if_mtu    = IPV6_MMTU;
 	ifp->if_ioctl  = stf_ioctl;
 	ifp->if_output = stf_output;
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	if_attach(ifp);
 	bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 	return (0);
diff --git a/sys/net80211/ieee80211.c b/sys/net80211/ieee80211.c
index 3d5669c..97ff7c2 100644
--- a/sys/net80211/ieee80211.c
+++ b/sys/net80211/ieee80211.c
@@ -394,8 +394,8 @@ ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
 	ifp->if_ioctl = ieee80211_ioctl;
 	ifp->if_init = ieee80211_init;
 	/* NB: input+output filled in by ether_ifattach */
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	vap->iv_ifp = ifp;
diff --git a/sys/netgraph/ng_eiface.c b/sys/netgraph/ng_eiface.c
index 72cc55c..4239328 100644
--- a/sys/netgraph/ng_eiface.c
+++ b/sys/netgraph/ng_eiface.c
@@ -369,7 +369,7 @@ ng_eiface_constructor(node_p node)
 	ifp->if_output = ether_output;
 	ifp->if_start = ng_eiface_start;
 	ifp->if_ioctl = ng_eiface_ioctl;
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
 
 	/* Give this node the same name as the interface (if possible) */
diff --git a/sys/netgraph/ng_fec.c b/sys/netgraph/ng_fec.c
index 919947a..ce5a2d5 100644
--- a/sys/netgraph/ng_fec.c
+++ b/sys/netgraph/ng_fec.c
@@ -1227,7 +1227,7 @@ ng_fec_constructor(node_p node)
 	ifp->if_start = ng_fec_start;
 	ifp->if_ioctl = ng_fec_ioctl;
 	ifp->if_init = ng_fec_init;
-	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
+	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	ifp->if_mtu = NG_FEC_MTU_DEFAULT;
 	ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST);
 	ifp->if_addrlen = 0;			/* XXX */
diff --git a/sys/netgraph/ng_iface.c b/sys/netgraph/ng_iface.c
index d53bf76..f94fd14 100644
--- a/sys/netgraph/ng_iface.c
+++ b/sys/netgraph/ng_iface.c
@@ -564,8 +564,8 @@ ng_iface_constructor(node_p node)
 	ifp->if_addrlen = 0;			/* XXX */
 	ifp->if_hdrlen = 0;			/* XXX */
 	ifp->if_baudrate = 64000;		/* XXX */
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	/* Give this node the same name as the interface (if possible) */
diff --git a/sys/netgraph/ng_tty.c b/sys/netgraph/ng_tty.c
index 2fa33fc..8408317 100644
--- a/sys/netgraph/ng_tty.c
+++ b/sys/netgraph/ng_tty.c
@@ -164,7 +164,7 @@ ngt_constructor(node_p node)
 	sc->node = node;
 
 	mtx_init(&sc->outq.ifq_mtx, "ng_tty node+queue", NULL, MTX_DEF);
-	IFQ_SET_MAXLEN(&sc->outq, IFQ_MAXLEN);
+	IFQ_SET_MAXLEN(&sc->outq, ifqmaxlen);
 
 	return (0);
 }
diff --git a/sys/pci/if_rl.c b/sys/pci/if_rl.c
index 8b22516..cd7609d 100644
--- a/sys/pci/if_rl.c
+++ b/sys/pci/if_rl.c
@@ -942,8 +942,8 @@ rl_attach(device_t dev)
 #ifdef DEVICE_POLLING
 	ifp->if_capabilities |= IFCAP_POLLING;
 #endif
-	IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
-	ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 	IFQ_SET_READY(&ifp->if_snd);
 
 	/*