See patch for your perusal but it looks like ingress qdisc is incorrectly applied to the source interface
rather than the ifb interface.  Running /etc/init.d/sqm stop/start manually on openwrt threw an error.

With the patch the right interfaces have the right qdiscs and bandwidths.


diff --git a/net/sqm-scripts/files/usr/lib/sqm/simple.qos b/net/sqm-scripts/files/usr/lib/sqm/simple.qos
index faeb4ec..3c5f2b5 100755
--- a/net/sqm-scripts/files/usr/lib/sqm/simple.qos
+++ b/net/sqm-scripts/files/usr/lib/sqm/simple.qos
@@ -157,7 +157,7 @@ then
 sqm_logger "Do not perform DSCP based filtering on ingress. (1-tier classification)"
 # Revert to no dscp based filtering
 case $QDISC in
-    cake*) $TC qdisc add dev $IFACE root $QDISC bandwidth ${DOWNLINK}kbit besteffort ;;
+    cake*) $TC qdisc add dev $DEV root $QDISC bandwidth ${DOWNLINK}kbit besteffort ;;
     *)    
 $TC qdisc add dev $DEV root handle 1: `get_stab_string` htb default 10
 $TC class add dev $DEV parent 1: classid 1:1 htb $LQ rate ${DOWNLINK}kbit ceil ${DOWNLINK}kbit `get_htb_adsll_string`
@@ -169,7 +169,7 @@ esac
 else
 sqm_logger "Perform DSCP based filtering on ingress. (3-tier classification)"
 case $QDISC in
-    cake*) $TC qdisc add dev $IFACE root $QDISC bandwidth ${DOWNLINK}kbit $CAKE_OPTS;;
+    cake*) $TC qdisc add dev $DEV root $QDISC bandwidth ${DOWNLINK}kbit $CAKE_OPTS;;
     *)    
 $TC qdisc add dev $DEV root handle 1: `get_stab_string` htb default 12
 $TC class add dev $DEV parent 1: classid 1:1 htb $LQ rate ${CEIL}kbit ceil ${CEIL}kbit `get_htb_adsll_string`



-- 
Thanks,

Kevin@Darbyshire-Bryant.me.uk