OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Base system
  • Assigned To No-one
  • Operating System All
  • Severity Critical
  • Priority Very Low
  • Reported Version openwrt-18.06
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by John Kohl - 10.08.2018

FS#1759 - SQM fine in 17.01.4, can’t keep up with line speed in 18.06 (Netgear R7800)

Netgear R7800 running 17.01.4 kept up with my ISP line speed (nominal 250Mbps/15Mbps) when configured to use SQM with cake/piece_of_cake.
In 18.06, it cannot keep up
Possibly the same root cause as issue 1598

DSLreports speed test with SQM enabled in 17.01.4 (223.1/14.71 Mbps):
http://www.dslreports.com/speedtest/29614883

and with 18.06 ( 95.8/14.16 Mbps):
http://www.dslreports.com/speedtest/36981183

root@LEDE:~# cat /etc/config/sqm

config queue 'eth1'
	option qdisc_advanced '0'
	option verbosity '5'
	option upload '15000'
	option linklayer 'ethernet'
	option overhead '18'
	option debug_logging '1'
	option download '232750'
	option interface 'eth0.2'
	option enabled '1'
	option qdisc 'cake'
	option script 'piece_of_cake.qos'

Sample tc output after running the DSLreports speed test

root@LEDE:~# tc -d qdisc
qdisc noqueue 0: dev lo root refcnt 2 
qdisc mq 0: dev eth0 root 
qdisc fq_codel 0: dev eth0 parent :1 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
qdisc mq 0: dev eth1 root 
qdisc fq_codel 0: dev eth1 parent :1 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
qdisc noqueue 0: dev br-lan root refcnt 2 
qdisc noqueue 0: dev eth1.1 root refcnt 2 
qdisc cake 8012: dev eth0.2 root refcnt 2 bandwidth 15Mbit besteffort triple-isolate split-gso rtt 100.0ms noatm overhead 18 
qdisc ingress ffff: dev eth0.2 parent ffff:fff1 ---------------- 
qdisc noqueue 0: dev br-guest root refcnt 2 
qdisc noqueue 0: dev br-iot root refcnt 2 
qdisc noqueue 0: dev wlan0 root refcnt 2 
qdisc noqueue 0: dev wlan1 root refcnt 2 
qdisc noqueue 0: dev wlan1-1 root refcnt 2 
qdisc noqueue 0: dev wlan1-2 root refcnt 2 
qdisc noqueue 0: dev wlan0-1 root refcnt 2 
qdisc fq_codel 0: dev ovpns0 root refcnt 2 limit 10240p flows 1024 quantum 1500 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
qdisc fq_codel 0: dev ovpns1 root refcnt 2 limit 10240p flows 1024 quantum 1500 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
qdisc cake 8013: dev ifb4eth0.2 root refcnt 2 bandwidth 232750Kbit besteffort triple-isolate wash split-gso rtt 100.0ms noatm overhead 18 

root@LEDE:~# 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 351709498 bytes 2034499 pkt (dropped 0, overlimits 0 requeues 65185) 
 backlog 0b 0p requeues 65185
qdisc fq_codel 0: dev eth0 parent :1 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
 Sent 351709498 bytes 2034499 pkt (dropped 0, overlimits 0 requeues 65185) 
 backlog 0b 0p requeues 65185
  maxpacket 1514 drop_overlimit 0 new_flow_count 60774 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc mq 0: dev eth1 root 
 Sent 4385184093 bytes 3164614 pkt (dropped 0, overlimits 0 requeues 109126) 
 backlog 0b 0p requeues 109126
qdisc fq_codel 0: dev eth1 parent :1 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
 Sent 4385184093 bytes 3164614 pkt (dropped 0, overlimits 0 requeues 109126) 
 backlog 0b 0p requeues 109126
  maxpacket 1514 drop_overlimit 0 new_flow_count 137321 ecn_mark 0
  new_flows_len 0 old_flows_len 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 eth1.1 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc cake 8012: dev eth0.2 root refcnt 2 bandwidth 15Mbit besteffort triple-isolate split-gso rtt 100.0ms noatm overhead 18 
 Sent 41321462 bytes 92960 pkt (dropped 919, overlimits 39456 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 194432b of 4Mb
 capacity estimate: 15Mbit
 min/max network layer size:           28 /    1500
 min/max overhead-adjusted size:       46 /    1518
 average network hdr offset:           14

                  Tin 0
  thresh         15Mbit
  target          5.0ms
  interval      100.0ms
  pk_delay        672us
  av_delay        211us
  sp_delay         11us
  backlog            0b
  pkts            93879
  bytes        42712828
  way_inds            6
  way_miss          392
  way_cols            0
  drops             919
  marks               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         12112
  quantum           457

qdisc ingress ffff: dev eth0.2 parent ffff:fff1 ---------------- 
 Sent 143870988 bytes 121001 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev br-guest root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev br-iot root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev wlan0 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev wlan1 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev wlan1-1 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev wlan1-2 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc noqueue 0: dev wlan0-1 root refcnt 2 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc fq_codel 0: dev ovpns0 root refcnt 2 limit 10240p flows 1024 quantum 1500 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
 Sent 2015423 bytes 2972 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 ovpns1 root refcnt 2 limit 10240p flows 1024 quantum 1500 target 5.0ms interval 100.0ms memory_limit 4Mb ecn 
 Sent 228 bytes 3 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 8013: dev ifb4eth0.2 root refcnt 2 bandwidth 232750Kbit besteffort triple-isolate wash split-gso rtt 100.0ms noatm overhead 18 
 Sent 148570176 bytes 120706 pkt (dropped 297, overlimits 622 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 661056b of 11637500b
 capacity estimate: 232750Kbit
 min/max network layer size:           46 /    1500
 min/max overhead-adjusted size:       64 /    1518
 average network hdr offset:           14

                  Tin 0
  thresh     232750Kbit
  target          5.0ms
  interval      100.0ms
  pk_delay        245us
  av_delay         45us
  sp_delay          4us
  backlog            0b
  pkts           121003
  bytes       149019834
  way_inds            6
  way_miss          384
  way_cols            0
  drops             297
  marks               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         12112
  quantum          1514

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