SQM - per-host isolation

useful-cosmic · July 7, 2026, 7:17am

The host isolation seems not to be working properly, as in I cannot download an iso and stream a 4k stream like bloomberg at the same time. Config is bellow: eth1 is the underlying device under the pppoe-wan adapter. Switching SQM to the pppoe-wan interface effectively disables the SQM and the bufferbloat goes up to C grade. Next hop is a VDSL2 bridged modem.

sqm.eth1=queue
sqm.eth1.enabled='1'
sqm.eth1.interface='eth1'
sqm.eth1.download='75000'
sqm.eth1.upload='17150'
sqm.eth1.qdisc='cake'
sqm.eth1.script='simple.qos'
sqm.eth1.linklayer='ethernet'
sqm.eth1.debug_logging='0'
sqm.eth1.verbosity='0'
sqm.eth1.qdisc_advanced='1'
sqm.eth1.squash_dscp='1'
sqm.eth1.squash_ingress='1'
sqm.eth1.ingress_ecn='NOECN'
sqm.eth1.egress_ecn='NOECN'
sqm.eth1.overhead='34'
sqm.eth1.linklayer_advanced='1'
sqm.eth1.tcMTU='2047'
sqm.eth1.tcTSIZE='128'
sqm.eth1.tcMPU='68'
sqm.eth1.linklayer_adaptation_mechanism='default'
sqm.eth1.qdisc_really_really_advanced='1'
sqm.eth1.iqdisc_opts='nat dual-dsthost ingress'
sqm.eth1.eqdisc_opts='nat dual-srchost'

moeller0 · July 7, 2026, 8:07am

This would be the correct interface to place sqm's qdisc instances on. What is the error you encounter there? Any specific or complicated network set-up between your router and the modem?
Could you just do the following:

copy and paste the output of tc -s qdisc
change your active sqm configuration to use pppoe-wan as interface and use piece_of_cake.qos
copy and paste the output of tc -s qdisc
run a test under https://test.libreqos.com/advanced after the test expand the "Advanced details" section and export as JPG by clicking the "DOWNLOAD JPG" button and post the image here
immediately after the test finishes (before you save abd post the results): tc -s qdisc again

The idea is to see how/if the

moeller0 · July 7, 2026, 8:08am

With cake I would always either recommend to use piece_of_cake.qos or layer_cake.qos.

useful-cosmic · July 7, 2026, 10:56am

Q1 - 1. copy and paste the output of tc -s qdisc on the current settings pasted in the original post.

tc -s qdisc
qdisc noqueue 0: dev lo root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc mq 0: dev eth0 root 
 Sent 161511631009 bytes 112134709 pkt (dropped 0, overlimits 0 requeues 11602) 
 backlog 0b 0p requeues 11602
qdisc fq_codel 0: dev eth0 parent :10 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :f limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :e limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :d limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :c limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :b limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :a limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :9 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 72691280466 bytes 51598174 pkt (dropped 0, overlimits 0 requeues 361) 
 backlog 0b 0p requeues 361
  maxpacket 19630 drop_overlimit 0 new_flow_count 60566 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :8 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :7 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 3812090817 bytes 2799325 pkt (dropped 0, overlimits 0 requeues 10896) 
 backlog 0b 0p requeues 10896
  maxpacket 36432 drop_overlimit 0 new_flow_count 9151 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :6 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 5370087 bytes 35878 pkt (dropped 0, overlimits 0 requeues 71) 
 backlog 0b 0p requeues 71
  maxpacket 612 drop_overlimit 0 new_flow_count 479 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :5 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 85002889639 bytes 57701332 pkt (dropped 0, overlimits 0 requeues 274) 
 backlog 0b 0p requeues 274
  maxpacket 1510 drop_overlimit 0 new_flow_count 687 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :4 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :3 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :2 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :1 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc cake 8059: dev eth1 root refcnt 17 bandwidth 17150Kbit diffserv3 dual-srchost nat nowash no-ack-filter split-gso rtt 100ms noatm overhead 34 mpu 68 
 Sent 3015572745 bytes 38695965 pkt (dropped 102, overlimits 25256837 requeues 608) 
 backlog 0b 0p requeues 608
 memory used: 901Kb of 4Mb
 capacity estimate: 17150Kbit
 min/max network layer size:           16 /    1500
 min/max overhead-adjusted size:       68 /    1534
 active queues:                         0
 average network hdr offset:           14

                   Bulk  Best Effort        Voice
  thresh       1071Kbit    17150Kbit     4287Kbit
  target         16.9ms          5ms          5ms
  interval        112ms        100ms        100ms
  pk_delay          0us       1.31ms          0us
  av_delay          0us        137us          0us
  sp_delay          0us          2us          0us
  backlog            0b           0b           0b
  pkts                0     38696067            0
  bytes               0   3015678937            0
  way_inds            0       887705            0
  way_miss            0        21372            0
  way_cols            0            0            0
  drops               0          102            0
  marks               0            0            0
  ack_drop            0            0            0
  sp_flows            0            1            0
  bk_flows            0            2            0
  un_flows            0            0            0
  max_len             0         1514            0
  quantum           300          523          300

qdisc ingress ffff: dev eth1 parent ffff:fff1 ---------------- 
 Sent 96824930262 bytes 67008091 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan2 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan3 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan4 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan5 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan1 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev br-lan root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev phy0-ap0 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev phy1-ap0 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev pppoe-wan root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc cake 805a: dev ifb4eth1 root refcnt 2 bandwidth 75Mbit besteffort dual-dsthost nat nowash ingress no-ack-filter split-gso rtt 100ms noatm overhead 34 mpu 68 
 Sent 96909607790 bytes 66020467 pkt (dropped 987624, overlimits 121144892 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 2511104b of 4Mb
 capacity estimate: 75Mbit
 min/max network layer size:           46 /    1500
 min/max overhead-adjusted size:       80 /    1534
 active queues:                         0
 average network hdr offset:           14

                  Tin 0
  thresh         75Mbit
  target            5ms
  interval        100ms
  pk_delay        122us
  av_delay         51us
  sp_delay          1us
  backlog            0b
  pkts         67008091
  bytes     98348716856
  way_inds      1094187
  way_miss        20092
  way_cols            0
  drops          987624
  marks               0
  ack_drop            0
  sp_flows            1
  bk_flows            1
  un_flows            0
  max_len         15140
  quantum          1514

useful-cosmic · July 7, 2026, 11:01am

Settings changed to:

uci show |grep sqm
sqm.eth1=queue
sqm.eth1.enabled='1'
sqm.eth1.interface='pppoe-wan'
sqm.eth1.download='75000'
sqm.eth1.upload='17150'
sqm.eth1.qdisc='cake'
sqm.eth1.script='piece_of_cake.qos'
sqm.eth1.linklayer='ethernet'
sqm.eth1.debug_logging='0'
sqm.eth1.verbosity='0'
sqm.eth1.qdisc_advanced='1'
sqm.eth1.squash_dscp='1'
sqm.eth1.squash_ingress='1'
sqm.eth1.ingress_ecn='NOECN'
sqm.eth1.egress_ecn='NOECN'
sqm.eth1.overhead='34'
sqm.eth1.linklayer_advanced='1'
sqm.eth1.tcMTU='2047'
sqm.eth1.tcTSIZE='128'
sqm.eth1.tcMPU='68'
sqm.eth1.linklayer_adaptation_mechanism='default'
sqm.eth1.qdisc_really_really_advanced='1'
sqm.eth1.iqdisc_opts='nat dual-dsthost ingress'
sqm.eth1.eqdisc_opts='nat dual-srchost'

useful-cosmic · July 7, 2026, 11:02am

new tc output with the settings targeting pppoe-wan

tc -s qdisc
qdisc noqueue 0: dev lo root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc mq 0: dev eth0 root 
 Sent 161757516669 bytes 112340371 pkt (dropped 0, overlimits 0 requeues 12135) 
 backlog 0b 0p requeues 12135
qdisc fq_codel 0: dev eth0 parent :10 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :f limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :e limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :d limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :c limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :b limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :a limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :9 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 72691396011 bytes 51598743 pkt (dropped 0, overlimits 0 requeues 361) 
 backlog 0b 0p requeues 361
  maxpacket 19630 drop_overlimit 0 new_flow_count 60573 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :8 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :7 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 4057809580 bytes 3004118 pkt (dropped 0, overlimits 0 requeues 11429) 
 backlog 0b 0p requeues 11429
  maxpacket 36432 drop_overlimit 0 new_flow_count 9527 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :6 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 5421439 bytes 36178 pkt (dropped 0, overlimits 0 requeues 71) 
 backlog 0b 0p requeues 71
  maxpacket 612 drop_overlimit 0 new_flow_count 484 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :5 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 85002889639 bytes 57701332 pkt (dropped 0, overlimits 0 requeues 274) 
 backlog 0b 0p requeues 274
  maxpacket 1510 drop_overlimit 0 new_flow_count 687 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :4 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :3 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :2 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :1 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc mq 0: dev eth1 root 
 Sent 237955 bytes 430 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc fq_codel 0: dev eth1 parent :10 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :f limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :e limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :d limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :c limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :b limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :a limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :9 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :8 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :7 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :6 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :5 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :4 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :3 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :2 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 237955 bytes 430 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :1 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc noqueue 0: dev lan2 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan3 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan4 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan5 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan1 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev br-lan root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev phy0-ap0 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev phy1-ap0 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc cake 805d: dev pppoe-wan root refcnt 2 bandwidth 17150Kbit besteffort dual-srchost nat nowash no-ack-filter split-gso rtt 100ms noatm overhead 34 mpu 68 
 Sent 228215 bytes 395 pkt (dropped 0, overlimits 354 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 56576b of 4Mb
 capacity estimate: 17150Kbit
 min/max network layer size:           40 /    1492
 min/max overhead-adjusted size:       74 /    1526
 active queues:                         0
 average network hdr offset:            0

                  Tin 0
  thresh      17150Kbit
  target            5ms
  interval        100ms
  pk_delay       4.87ms
  av_delay       1.22ms
  sp_delay          2us
  backlog            0b
  pkts              395
  bytes          228215
  way_inds            0
  way_miss           50
  way_cols            0
  drops               0
  marks               0
  ack_drop            0
  sp_flows            1
  bk_flows            1
  un_flows            0
  max_len          1492
  quantum           523

qdisc ingress ffff: dev pppoe-wan parent ffff:fff1 ---------------- 
 Sent 5920 bytes 71 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc cake 805e: dev ifb4pppoe-wan root refcnt 2 bandwidth 75Mbit besteffort dual-dsthost nat wash ingress no-ack-filter split-gso rtt 100ms noatm overhead 34 mpu 68 
 Sent 5976 bytes 71 pkt (dropped 0, overlimits 6 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 13056b of 4Mb
 capacity estimate: 75Mbit
 min/max network layer size:           40 /     279
 min/max overhead-adjusted size:       74 /     313
 active queues:                         0
 average network hdr offset:            0

                  Tin 0
  thresh         75Mbit
  target            5ms
  interval        100ms
  pk_delay         23us
  av_delay          2us
  sp_delay          2us
  backlog            0b
  pkts               71
  bytes            5976
  way_inds            0
  way_miss           46
  way_cols            0
  drops               0
  marks               0
  ack_drop            0
  sp_flows            1
  bk_flows            0
  un_flows            0
  max_len           376
  quantum          1514

useful-cosmic · July 7, 2026, 11:05am

tc output 10 seconds after the bufferbloat test:

tc -s qdisc
qdisc noqueue 0: dev lo root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc mq 0: dev eth0 root 
 Sent 161972328228 bytes 112529736 pkt (dropped 0, overlimits 0 requeues 12578) 
 backlog 0b 0p requeues 12578
qdisc fq_codel 0: dev eth0 parent :10 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :f limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :e limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :d limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :c limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :b limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :a limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :9 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 72691406431 bytes 51598823 pkt (dropped 0, overlimits 0 requeues 361) 
 backlog 0b 0p requeues 361
  maxpacket 19630 drop_overlimit 0 new_flow_count 60573 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :8 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :7 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 4272606025 bytes 3193377 pkt (dropped 0, overlimits 0 requeues 11870) 
 backlog 0b 0p requeues 11870
  maxpacket 36432 drop_overlimit 0 new_flow_count 9864 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :6 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 5426133 bytes 36204 pkt (dropped 0, overlimits 0 requeues 73) 
 backlog 0b 0p requeues 73
  maxpacket 612 drop_overlimit 0 new_flow_count 484 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :5 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 85002889639 bytes 57701332 pkt (dropped 0, overlimits 0 requeues 274) 
 backlog 0b 0p requeues 274
  maxpacket 1510 drop_overlimit 0 new_flow_count 687 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :4 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :3 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :2 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth0 parent :1 limit 10240p flows 1024 quantum 1518 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc mq 0: dev eth1 root 
 Sent 62021022 bytes 77182 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc fq_codel 0: dev eth1 parent :10 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :f limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :e limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :d limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :c limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :b limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :a limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :9 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :8 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :7 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :6 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :5 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :4 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :3 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :2 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 62021022 bytes 77182 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev eth1 parent :1 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 4Mb ecn drop_batch 64 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc noqueue 0: dev lan2 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan3 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan4 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan5 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev lan1 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev br-lan root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev phy0-ap0 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev phy1-ap0 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc cake 805d: dev pppoe-wan root refcnt 2 bandwidth 17150Kbit besteffort dual-srchost nat nowash no-ack-filter split-gso rtt 100ms noatm overhead 34 mpu 68 
 Sent 60322106 bytes 77068 pkt (dropped 17, overlimits 93372 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 207Kb of 4Mb
 capacity estimate: 17150Kbit
 min/max network layer size:           40 /    1492
 min/max overhead-adjusted size:       74 /    1526
 active queues:                         0
 average network hdr offset:            0

                  Tin 0
  thresh      17150Kbit
  target            5ms
  interval        100ms
  pk_delay       6.94ms
  av_delay       1.71ms
  sp_delay          2us
  backlog            0b
  pkts            77085
  bytes        60322990
  way_inds            1
  way_miss          121
  way_cols            0
  drops              17
  marks             278
  ack_drop            0
  sp_flows            1
  bk_flows            1
  un_flows            0
  max_len         15840
  quantum           523

qdisc ingress ffff: dev pppoe-wan parent ffff:fff1 ---------------- 
 Sent 19298 bytes 240 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc cake 805e: dev ifb4pppoe-wan root refcnt 2 bandwidth 75Mbit besteffort dual-dsthost nat wash ingress no-ack-filter split-gso rtt 100ms noatm overhead 34 mpu 68 
 Sent 19382 bytes 240 pkt (dropped 0, overlimits 21 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 13056b of 4Mb
 capacity estimate: 75Mbit
 min/max network layer size:           40 /    1314
 min/max overhead-adjusted size:       74 /    1348
 active queues:                         0
 average network hdr offset:            0

                  Tin 0
  thresh         75Mbit
  target            5ms
  interval        100ms
  pk_delay         47us
  av_delay          5us
  sp_delay          2us
  backlog            0b
  pkts              240
  bytes           19382
  way_inds            0
  way_miss          139
  way_cols            0
  drops               0
  marks               0
  ack_drop            0
  sp_flows            1
  bk_flows            0
  un_flows            0
  max_len          1314
  quantum          1514
![bufferbloat-test-results-2026-07-07T11-04-09|582x499](upload://mIkQ07QBnkwx1J5Dv3DQAbFu2wC.jpeg)

``

![bufferbloat-test-results-2026-07-07T11-04-09|582x499](upload://mIkQ07QBnkwx1J5Dv3DQAbFu2wC.jpeg)

useful-cosmic · July 7, 2026, 11:06am

useful-cosmic · July 7, 2026, 11:08am

As for the setup there is nothing odd, the wan port of the MT6000 is connected to a Zyxel VMG-4005 in bridge mode.

useful-cosmic · July 7, 2026, 11:17am

Hmm, wondering if the output of luci sqm app is saving correctly and being used correctly too. Let me wipe the sqm instance and retry.

moeller0 · July 7, 2026, 11:21am

This is a bit odd, I would expect closer to 1500 here, I guess that might be a consequence of plusnet maybe using ds-lite...

but with that you can expect at best:
Up: 17.15 * ((1500-8-20-20)/(1500-8+34)) = 16.32 Mbps
Down: 75 * ((1314-20-20)/(1314+34)) = 70.88 Mbps

However the fact that latency increases by 15-19 ms under load implies that something is not well configured here.

What is the DSL sync you get on the modem?

useful-cosmic · July 7, 2026, 11:24am

newly added config block via luci after deleting the old one:

uci show|grep sqm
sqm.@queue[0]=queue
sqm.@queue[0].enabled='1'
sqm.@queue[0].interface='pppoe-wan'
sqm.@queue[0].download='75000'
sqm.@queue[0].upload='17150'
sqm.@queue[0].debug_logging='0'
sqm.@queue[0].verbosity='0'
sqm.@queue[0].qdisc='cake'
sqm.@queue[0].script='piece_of_cake.qos'
sqm.@queue[0].linklayer='ethernet'
sqm.@queue[0].qdisc_advanced='1'
sqm.@queue[0].squash_dscp='1'
sqm.@queue[0].squash_ingress='1'
sqm.@queue[0].ingress_ecn='NOECN'
sqm.@queue[0].egress_ecn='NOECN'
sqm.@queue[0].qdisc_really_really_advanced='1'
sqm.@queue[0].iqdisc_opts='nat dual-dsthost ingress'
sqm.@queue[0].eqdisc_opts='nat dual-srchost'
sqm.@queue[0].overhead='34'
sqm.@queue[0].linklayer_advanced='1'
sqm.@queue[0].tcMTU='2047'
sqm.@queue[0].tcTSIZE='128'
sqm.@queue[0].tcMPU='68'
sqm.@queue[0].linklayer_adaptation_mechanism='cake'

useful-cosmic · July 7, 2026, 11:26am

xdslctl output:


============================================================================
    VDSL Training Status:   Showtime
                    Mode:   VDSL2 Annex B
            VDSL Profile:   Profile 17a
                G.Vector:   Disable
            Traffic Type:   PTM Mode
             Link Uptime:   6 days: 11 hours: 1 minute
============================================================================
       VDSL Port Details       Upstream         Downstream
               Line Rate:     17.280 Mbps       79.998 Mbps
    Actual Net Data Rate:     17.247 Mbps       79.999 Mbps
          Trellis Coding:         ON                ON
              SNR Margin:        5.7 dB            3.6 dB
            Actual Delay:          0 ms              0 ms
          Transmit Power:        7.4 dBm          12.7 dBm
           Receive Power:       -4.1 dBm          -8.2 dBm
              Actual INP:        0.0 symbols      58.0 symbols
       Total Attenuation:       11.5 dB           20.9 dB
Attainable Net Data Rate:     17.138 Mbps       83.325 Mbps
============================================================================
      VDSL Band Status    U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  4.5    28.0    43.7     N/A    14.4    36.5    56.0   
Signal Attenuation(dB):  4.5    27.8    43.2     N/A    16.7    36.3    56.0   
        SNR Margin(dB):  6.1     5.7     5.7     N/A     3.8     3.6     3.6   
   Transmit Power(dBm):  0.3   -14.4     6.4     N/A     8.4     7.8     7.6   
============================================================================

            VDSL Counters

           Downstream        Upstream
Since Link time = 1 min 17 sec
FEC:		1681183		290
CRC:		3		40
ES:		1		41
SES:		0		0
UAS:		0		0
LOS:		0		0
LOF:		0		0
LOM:		0		0
Retr:		0
FailedRetr:	0
FailedFastRetr:	0
Latest 15 minutes time = 10 min 15 sec
FEC:		846		0
CRC:		0		0
ES:		0		0
SES:		0		0
UAS:		0		0
LOS:		0		0
LOF:		0		0
LOM:		0		0
Retr:		0
FailedRetr:	0
FailedFastRetr:	0
Previous 15 minutes time = 15 min 0 sec
FEC:		4670		0
CRC:		0		0
ES:		0		0
SES:		0		0
UAS:		0		0
LOS:		0		0
LOF:		0		0
LOM:		0		0
Retr:		N/A
HostInitRetr:	N/A
FailedRetr:	N/A
Latest 1 day time = 23 hours 55 min 15 sec
FEC:		270054		125
CRC:		0		12
ES:		0		12
SES:		0		0
UAS:		0		0
LOS:		0		0
LOF:		0		0
LOM:		0		0
Retr:		0
FailedRetr:	0
FailedFastRetr:	0
Previous 1 day time = 24 hours 0 sec
FEC:		219649		33
CRC:		3		6
ES:		1		6
SES:		0		0
UAS:		0		0
LOS:		0		0
LOF:		0		0
LOM:		0		0
Retr:		0
FailedRetr:	0
FailedFastRetr:	0
Total time = 1 days 23 hours 55 min 15 sec
FEC:		2676202		325
CRC:		3		42
ES:		10		43
SES:		10		0
UAS:		67		57
LOS:		1		0
LOF:		0		0
LOM:		0		0
Retr:		1
FailedRetr:	0
FailedFastRetr:	0
============================================================================
Operational status: Up
BytesSent: -1
BytesReceived: -1
PacketsSent: 72846079
PacketsReceived: 140066461
FramesDropped: 0

useful-cosmic · July 7, 2026, 11:40am

It feels like I cannot shape the download anymore at all, whatever setting I am putting in the ingress section (even 50000) it doesn't bring the download latency lower than 19.5ms.

moeller0 · July 7, 2026, 11:43am

Mmmh, that would allow only:

17.247 * (64/65) = 16.98 Mbps, so your egress shaper is set a bit too high (the 64/65 accounts for PTM overhead)

79.999 * (64/65) = 78.77 Mbps so your download shaper is OK, but still a bit on the high side, we typically recommend more like 90% of the gross capacity, so more like 72 or 70 Mbps. That said, this is a policy decision you need to make, if you are happy with 75 Mbps I am happy as well. None of this explains the odd packet size things in download direction we see.
Could you take a packet capture on your router during a speedtest and have a look at packet size distributions and patentially fragmentation?

moeller0 · July 7, 2026, 11:43am

Well, does the achieved throughput change to below 50?

useful-cosmic · July 7, 2026, 11:44am

same output, the latecny stays at 19.5 - 19.8 forever regardless of the changes

useful-cosmic · July 7, 2026, 11:46am

new tc output showing a bit towards normal now with the new settings:

qdisc cake 8075: dev pppoe-wan root refcnt 2 bandwidth 17150Kbit besteffort dual-srchost nat nowash no-ack-filter split-gso rtt 100ms noatm overhead 34 mpu 68 
 Sent 136222257 bytes 205671 pkt (dropped 7, overlimits 217851 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 179712b of 4Mb
 capacity estimate: 17150Kbit
 min/max network layer size:           40 /    1492
 min/max overhead-adjusted size:       74 /    1526
 active queues:                         0
 average network hdr offset:            0

                  Tin 0
  thresh      17150Kbit
  target            5ms
  interval        100ms
  pk_delay       5.05ms
  av_delay        975us
  sp_delay          2us
  backlog            0b
  pkts           205678
  bytes       136222621
  way_inds            0
  way_miss          322
  way_cols            0
  drops               7
  marks              58
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         15840
  quantum           523

qdisc ingress ffff: dev pppoe-wan parent ffff:fff1 ---------------- 
 Sent 59609 bytes 573 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc cake 8076: dev ifb4pppoe-wan root refcnt 2 bandwidth 72Mbit besteffort dual-dsthost nat wash ingress no-ack-filter split-gso rtt 100ms noatm overhead 34 mpu 68 
 Sent 60001 bytes 573 pkt (dropped 0, overlimits 45 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 17Kb of 4Mb
 capacity estimate: 72Mbit
 min/max network layer size:           28 /    1308
 min/max overhead-adjusted size:       68 /    1342
 active queues:                         0
 average network hdr offset:            0

                  Tin 0
  thresh         72Mbit
  target            5ms
  interval        100ms
  pk_delay         59us
  av_delay          9us
  sp_delay          3us
  backlog            0b
  pkts              573
  bytes           60001
  way_inds            0
  way_miss          418
  way_cols            0
  drops               0
  marks               0
  ack_drop            0
  sp_flows            1
  bk_flows            0
  un_flows            0
  max_len          1308
  quantum          1514

useful-cosmic · July 7, 2026, 11:50am

And that is the reason i used eth1 and not the pppoe-wan interface to put sqm on.

moeller0 · July 7, 2026, 11:59am

The problem is with PPPoE not everything works from eth1 as cake has troubles looking through the PPPoE encapsulation... so for the time being, you really should to put cake onto the innermost interface.

Have you reduced the upload shaper to 16.9 Mbps yet, 17.15 seems too high?