root@GL-MV1000:~# SQM_DEBUG=1 SQM_VERBOSITY_MAX=8 /etc/init.d/sqm stop ; SQM_DEB
UG=1 SQM_VERBOSITY_MAX=8 /etc/init.d/sqm start
SQM: Stopping SQM on wan
SQM: Starting SQM script: piece_of_cake.qos on wan, in: 90000 Kbps, out: 15000 Kbps
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link add name TMP_IFB_4_SQM type ifb
SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM root cake
SQM: QDISC cake is useable.
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev TMP_IFB_4_SQM down
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link delete TMP_IFB_4_SQM type ifb
SQM: Starting piece_of_cake.qos
SQM: ifb associated with interface wan:
SQM: Currently no ifb is associated with wan, this is normal during starting of the sqm system.
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link add name ifb4wan type ifb
SQM: egress
SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev wan root
SQM: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
SQM: LLA: default link layer adjustment method for cake is cake
SQM: cake link layer adjustments:  overhead 44 mpu 0
SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev wan root cake bandwidth 15000kbit overhead 44 mpu 0 besteffort dual-srchost
SQM: egress shaping activated
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link add name TMP_IFB_4_SQM type ifb
SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM ingress
SQM: QDISC ingress is useable.
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev TMP_IFB_4_SQM down
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link delete TMP_IFB_4_SQM type ifb
SQM: ingress
SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev wan handle ffff: ingress
SQM: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: Invalid argument
SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev wan handle ffff: ingress
SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev ifb4wan root
SQM: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
SQM: LLA: default link layer adjustment method for cake is cake
SQM: cake link layer adjustments:  overhead 44 mpu 0
SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev ifb4wan root cake bandwidth 90000kbit overhead 44 mpu 0 besteffort wash dual-dsthost ingress
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev ifb4wan up
SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc filter add dev wan parent ffff: protocol all prio 10 u32 match u32 0 0 flowid 1:1 action mirred egress redirect dev ifb4wan
SQM: ingress shaping activated
SQM: piece_of_cake.qos was started on wan successfully
root@GL-MV1000:~# cat /var/run/sqm/*debug.log

Mon Apr 12 20:04:12 UTC 2021: Starting.
Starting SQM script: piece_of_cake.qos on wan, in: 90000 Kbps, out: 15000 Kbps
/sbin/ip link add name TMP_IFB_4_SQM type ifb

cmd_wrapper: ip: SUCCESS: /sbin/ip link add name TMP_IFB_4_SQM type ifb
/usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM root cake

cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM root cake
QDISC cake is useable.
/sbin/ip link set dev TMP_IFB_4_SQM down

cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev TMP_IFB_4_SQM down
/sbin/ip link delete TMP_IFB_4_SQM type ifb

cmd_wrapper: ip: SUCCESS: /sbin/ip link delete TMP_IFB_4_SQM type ifb
Starting piece_of_cake.qos
ifb associated with interface wan:
Currently no ifb is associated with wan, this is normal during starting of the sqm system.
/sbin/ip link add name ifb4wan type ifb

cmd_wrapper: ip: SUCCESS: /sbin/ip link add name ifb4wan type ifb
egress
/usr/sbin/tc qdisc del dev wan root
RTNETLINK answers: No such file or directory
cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev wan root
cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
LLA: default link layer adjustment method for cake is cake
cake link layer adjustments:  overhead 44 mpu 0
/usr/sbin/tc qdisc add dev wan root cake bandwidth 15000kbit overhead 44 mpu 0 besteffort dual-srchost
cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev wan root cake bandwidth 15000kbit overhead 44 mpu 0 besteffort dual-srchost
egress shaping activated
/sbin/ip link add name TMP_IFB_4_SQM type ifb

cmd_wrapper: ip: SUCCESS: /sbin/ip link add name TMP_IFB_4_SQM type ifb
/usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM ingress

cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM ingress
QDISC ingress is useable.
/sbin/ip link set dev TMP_IFB_4_SQM down

cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev TMP_IFB_4_SQM down
/sbin/ip link delete TMP_IFB_4_SQM type ifb

cmd_wrapper: ip: SUCCESS: /sbin/ip link delete TMP_IFB_4_SQM type ifb
ingress
/usr/sbin/tc qdisc del dev wan handle ffff: ingressRTNETLINK answers: Invalid argument
cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev wan handle ffff: ingress
cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: Invalid argument
/usr/sbin/tc qdisc add dev wan handle ffff: ingress
cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev wan handle ffff: ingress
/usr/sbin/tc qdisc del dev ifb4wan root
RTNETLINK answers: No such file or directory
cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev ifb4wan root
cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
LLA: default link layer adjustment method for cake is cake
cake link layer adjustments:  overhead 44 mpu 0
/usr/sbin/tc qdisc add dev ifb4wan root cake bandwidth 90000kbit overhead 44 mpu 0 besteffort wash dual-dsthost ingress

cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev ifb4wan root cake bandwidth 90000kbit overhead 44 mpu 0 besteffort wash dual-dsthost ingress
/sbin/ip link set dev ifb4wan up

cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev ifb4wan up
/usr/sbin/tc filter add dev wan parent ffff: protocol all prio 10 u32 match u32 0 0 flowid 1:1 action mirred egress redirect dev ifb4wan

cmd_wrapper: tc: SUCCESS: /usr/sbin/tc filter add dev wan parent ffff: protocol all prio 10 u32 match u32 0 0 flowid 1:1 action mirred egress redirect dev ifb4wan
ingress shaping activated
piece_of_cake.qos was started on wan successfully
root@GL-MV1000:~#