SQM recommendations for Cable (Comcast)

For Developers
1

I am a noob at this but this is my current setup. Without sqm enabled I get approx 63/13 speeds.
I am currently running two separate sqms on eth0 and br-lan. Here is the info below.

     _________
    /        /\      _    ___ ___  ___
   /  LE    /  \    | |  | __|   \| __|
  /    DE  /    \   | |__| _|| |) | _|
 /________/  LE  \  |____|___|___/|___|                      lede-project.org
 \        \   DE /
  \    LE  \    /  -----------------------------------------------------------
   \  DE    \  /    Reboot (17.01.4, r3560-79f57e422d)
    \________\/    -----------------------------------------------------------

root@R7800:~# 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 cake 800f: dev eth0 root refcnt 2 bandwidth 11700Kbit besteffort dual-srchost nat rtt 100.0ms noatm overhead 18 via-ethernet total_overhead 18 hard_header_len 14 mpu 64 
 Sent 2036461 bytes 10096 pkt (dropped 0, overlimits 1041 requeues 0) 
 backlog 0b 0p requeues 0 
 memory used: 12Kb of 4Mb
 capacity estimate: 11700Kbit
                  Tin 0
  thresh      11700Kbit
  target          5.0ms
  interval      100.0ms
  pk_delay        205us
  av_delay         21us
  sp_delay          7us
  pkts            10096
  bytes         2036461
  way_inds           67
  way_miss         1144
  way_cols            0
  drops               0
  marks               0
  sp_flows            1
  bk_flows            1
  un_flows            0
  max_len          1514

qdisc ingress ffff: dev eth0 parent ffff:fff1 ---------------- 
 Sent 16180247 bytes 15112 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0 
qdisc fq_codel 0: dev eth1 root refcnt 2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms ecn 
 Sent 8107794 bytes 9860 pkt (dropped 0, overlimits 0 requeues 5) 
 backlog 0b 0p requeues 5 
  maxpacket 1514 drop_overlimit 0 new_flow_count 3 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc cake 8009: dev br-lan root refcnt 2 bandwidth 56700Kbit besteffort dual-srchost nat rtt 100.0ms noatm overhead 18 via-ethernet total_overhead 18 hard_header_len 14 mpu 64 
 Sent 8106201 bytes 9852 pkt (dropped 0, overlimits 4104 requeues 0) 
 backlog 0b 0p requeues 0 
 memory used: 36944b of 4Mb
 capacity estimate: 56700Kbit
                  Tin 0
  thresh      56700Kbit
  target          5.0ms
  interval      100.0ms
  pk_delay        294us
  av_delay         61us
  sp_delay          4us
  pkts             9852
  bytes         8106201
  way_inds            0
  way_miss         1006
  way_cols            0
  drops               0
  marks               0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         10598

qdisc ingress ffff: dev br-lan parent ffff:fff1 ---------------- 
 Sent 1857127 bytes 8931 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0 
qdisc cake 800a: dev ifb4br-lan root refcnt 2 bandwidth 11700Kbit besteffort dual-dsthost nat rtt 100.0ms noatm overhead 18 via-ethernet total_overhead 18 hard_header_len 14 mpu 64 
 Sent 1982873 bytes 8931 pkt (dropped 0, overlimits 2849 requeues 0) 
 backlog 0b 0p requeues 0 
 memory used: 16Kb of 4Mb
 capacity estimate: 11700Kbit
                  Tin 0
  thresh      11700Kbit
  target          5.0ms
  interval      100.0ms
  pk_delay        695us
  av_delay        108us
  sp_delay         11us
  pkts             8931
  bytes         1982873
  way_inds            0
  way_miss         1203
  way_cols            0
  drops               0
  marks               0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len          2880

qdisc cake 8010: dev ifb4eth0 root refcnt 2 bandwidth 56700Kbit besteffort dual-dsthost nat wash rtt 100.0ms noatm overhead 18 via-ethernet total_overhead 18 hard_header_len 14 mpu 64 
 Sent 16716787 bytes 15106 pkt (dropped 6, overlimits 7400 requeues 0) 
 backlog 0b 0p requeues 0 
 memory used: 125640b of 4Mb
 capacity estimate: 56700Kbit
                  Tin 0
  thresh      56700Kbit
  target          5.0ms
  interval      100.0ms
  pk_delay        775us
  av_delay        209us
  sp_delay          6us
  pkts            15112
  bytes        16725651
  way_inds            0
  way_miss         1328
  way_cols            0
  drops               6
  marks               4
  sp_flows            1
  bk_flows            1
  un_flows            0
  max_len         37850



Some more info:eth0
	56700/11700( with no sqm 63/13)
Cake
Piece of Cake 
Show and Use Advanced Selected
	SQUASH
	Ignore
	ECN
	NoECN
Show and Use Dangerous Selected
	nat dual-dsthost mpu 64
	nat dual-srchost mpu 64
Link Layer
	ethernet with overhead
	18
	Show advanced
		2047
		128
		64
		default

br-lan
	56700/11700( with no sqm 63/13)
Cake
Test_LAN_triple-isolate_piece_of_cake.qos
Show and Use Advanced Selected
	SQUASH
	Ignore
	ECN
	NoECN
Show and Use Dangerous Selected
	nat dual-dsthost mpu 64
	nat dual-srchost mpu 64
Link Layer
	ethernet with overhead
	18
	Show advanced
		2047
		128
		64
		default
2

Why would you use SQM on br-lan?

3

Just seemed logical to me. Should I remove it. Is there no need? I saw that lan triple isolate and a wan triple isolate and it made me think I could try an sqm on the lan interface.

4

So, due to a cake bug (since fixed) the automatic overhead accounting is a bit broken but that should be fixed with once you update to a newer cake (as should be part of the 18.X openwrt release).
But do you have any issues or specific questions?