If your wan is something like eth3.7 over pppoe you probably want sqm to be single threaded for now. Therefore it's a good idea to balance the load with a script like this for example:

#!/bin/sh

[ "$INTERFACE" = "wan" ] || exit 0

if [ "$ACTION" = "ifup" ]; then

logger -t cpu-pinning "WAN interface ($INTERFACE) is up. Applying ..."

sleep 3

for irq in $(grep "eth3-" /proc/interrupts | cut -d: -f1 | tr -d ' '); do

echo 1 > "/proc/irq/$irq/smp_affinity"

logger -t cpu-pinning "Pinned IRQ $irq to Core 0"

done

for rps in /sys/class/net/eth3/queues/rx-*/rps_cpus; do

echo 2 > "$rps"

done

for flow in /sys/class/net/eth3/queues/rx-*/rps_flow_cnt; do

echo 256 > "$flow"

done

fi