Hi there just got a question about SQM, I've been through the how to's and read a lot of other post about it and I've set mine up as i think it should be and im happy with how much it has helped my bufferbloat as it was quite bad at times. what i would like to know is if ive got it as good as it gets with my line or if it can be tuned more to keep it down more. I am with virgin media that uses fibre and my speeds without sqm are roughly 200/10 although can be a bit higher at times, i do all config through the gui and will post dslreports results both with sqm on and off, thanks for any answers.
sqm off
sqm on
would just like to add that most other tests ive done have had a+ bufferbloat.
BIGFAT
January 27, 2019, 8:29pm
3
I personally set dl/uprate at 80% because bufferbloat can go up if a lot is going on the isp side. For example late afternoon once everybody come home and start downloading stuff on each dsl/cable line. It can happen that they cant give you the full speed for a second or so. For more unstable line (like LTE) you can even try autorate-ingress.
Take a look over here: https://dl.lochnair.net/Bufferbloat/Cake/tc-cake.8.html
You can inform yourself over the overhead you need to set and all the additional option existing for your cable line. Do it without luci, since some options are not available or will overwrite those made by you. Use cli with nano/vim or uci instead.
To give you an idea of what is possible, here is my config for my vdsl2 line in germany:
config queue 'eth1'
option debug_logging '0'
option verbosity '5'
option qdisc 'cake'
option enabled '1'
option download '75200'
option upload '28000'
option interface 'pppoe-wan'
option qdisc_advanced '1'
option squash_dscp '1'
option ingress_ecn 'ECN'
option qdisc_really_really_advanced '1'
option iqdisc_opts 'pppoe-ptm ether-vlan diffserv4 nat dual-srchost ingress'
option eqdisc_opts 'pppoe-ptm ether-vlan diffserv4 nat dual-dsthost'
option squash_ingress '0'
option egress_ecn 'ECN'
option script 'layer_cake.qos'
Some ECN settings are experimental for my setup and you will probably wont need it.
I would recommend to kick-out those "pppoe-ptm ether-vlan" keywords and use:
option qdisc_advanced '1'
option qdisc_really_really_advanced '1'
option linklayer 'ethernet'
option overhead '34'
option linklayer_advanced '1'
option tcMTU '2047'
option tcTSIZE '128'
option tcMPU '64'
option linklayer_adaptation_mechanism 'default'
instead, as pppoe-ptm does not set the mpu appropriately.
1 Like
Thanks for replies, what i was looking for was someone with the right knowledge to take a quick look at my reports and tell me if they think they are reasonable, ive never done cli config or anything so a bit hesitant to start. I know theres alot of variables settings, and if theres interest i can send pics of what ive done to Sqm tomorrow.
Well, CLI does not really need to be scary, see https://openwrt.org/docs/guide-quick-start/sshadministration
cat /etc/config/sqm
tc -s qdisc
cat /proc/cpuinfo
cat /etc/os-release
2 Likes
Kingjjk
January 27, 2019, 10:32pm
7
will take a look tomorrow when ive got time, i take it that would be easier to have a look at than my report or just pics of what ive set up. I appreciate the help.
1 Like
BIGFAT
January 28, 2019, 4:16am
8
Thank you. Its kinda hard to find all informations needed. Setting the mtu was the next step to look at for me.
So just install putty and then sign into router from there, then type those commands?
1 Like
Yes, please! That is type the command and then copy the output (best including the actual command line) into a new message in this thread. For a nicer display add a line with 3 backticks ` (I only show a single one here, other wise the forum will change the formatting) before and after the pasted data.
1 Like
Kingjjk
January 28, 2019, 2:22pm
11
Ok i will try and do it soon thanks.
Oh, MTU is fine the issue is the mpu or the minimal packet size that an interface will ever encounter, in the case of ethernet that that would be 84 bytes I believe (64 plus IFG and preamble) and for VDSL2 it probably is 68. But I note that most packets will exceed this size all by themselves (notorious exceptions are e.g. ARP packets, but these are rare on VDSL links as far as I can tell.)
Kingjjk
January 28, 2019, 3:39pm
13
Putty isnt recognizing my password for openwrt although i can log into the router on a browser with same password no problem.
Kingjjk
February 1, 2019, 8:59pm
14
Anyone any ideas why my password wouldnt be recognised using putty, thanks.
make sure to use ssh, putty have ssh and telnet.
FYI, I use a free utility called prettyping for a basic test of bufferbloat. It works on most BSD, LINUX, MAC OSX platforms.
Jasons-MBP:Downloads Jason$ ./prettyping 8.8.8.8
0 ▁ 10 ▂ 20 ▃ 30 ▄ 40 ▅ 50 ▆ 60 ▇ 70 █ 80 ▁ 90 ▂ 100 ▃ 110 ▄ 120 ▅ 130 ▆ 140 ▇ 150 █ 160 ▁ 170 ▂ 180 ▃ 190 ▄ 200 ▅ 210 ▆ 220 ▇ 230 █ ∞
PING 8.8.8.8 (8.8.8.8): 56 data bytes
▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄^C
0/ 69 ( 0%) lost; 35/ 37/ 39ms; last: 36ms
0/ 60 ( 0%) lost; 35/ 37/ 38/ 1ms (last 60)
--- 8.8.8.8 ping statistics ---
69 packets transmitted, 69 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 35.530/37.338/39.527/0.896 ms
Kingjjk
February 2, 2019, 8:13am
17
Thanks i managed to sort out my problem using putty, simple question, how do i copy and paste the results to the commands you asked for in putty?
Sparks
February 2, 2019, 9:34am
18
Should be just left click and drag a selection in putty. It should auto copy the selection to clipboard, then paste the results into your reply with triple backticks a line by themselves like this
type or paste code here
Kingjjk
February 2, 2019, 10:22am
20
root@OpenWrt:~# cat /etc/config/sqm
config queue 'eth1'
option debug_logging '0'
option interface 'eth1.2'
option verbosity '5'
option upload '10800'
option qdisc 'cake'
option linklayer 'ethernet'
option overhead '18'
option qdisc_advanced '1'
option squash_dscp '1'
option squash_ingress '1'
option ingress_ecn 'ECN'
option egress_ecn 'NOECN'
option qdisc_really_really_advanced '1'
option iqdisc_opts 'nat dual-dsthost'
option eqdisc_opts 'nat dual-srchost'
option download '172000'
option linklayer_advanced '1'
option tcMTU '2047'
option tcTSIZE '128'
option tcMPU '64'
option linklayer_adaptation_mechanism 'cake'
option script 'piece_of_cake.qos'
option enabled '1'
Kingjjk
February 2, 2019, 10:25am
21
root@OpenWrt:~# 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 eth1 root
Sent 10154241909 bytes 100296025 pkt (dropped 0, overlimits 0 requeues 18)
backlog 0b 0p requeues 18
qdisc fq_codel 0: dev eth1 parent :8 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 :1 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 10154241909 bytes 100296025 pkt (dropped 0, overlimits 0 requeues 18)
backlog 0b 0p requeues 18
maxpacket 1514 drop_overlimit 0 new_flow_count 5 ecn_mark 0
new_flows_len 0 old_flows_len 0
qdisc mq 0: dev eth0 root
Sent 54548006872 bytes 41638566 pkt (dropped 0, overlimits 0 requeues 322)
backlog 0b 0p requeues 322
qdisc fq_codel 0: dev eth0 parent :8 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 :6 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 :5 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 :4 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 54548006872 bytes 41638566 pkt (dropped 0, overlimits 0 requeues 322)
backlog 0b 0p requeues 322
maxpacket 7570 drop_overlimit 0 new_flow_count 231 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 eth0.1 root refcnt 2
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
qdisc cake 8013: dev eth1.2 root refcnt 2 bandwidth 10800Kbit besteffort dual-srchost nat nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 18 mpu 64
Sent 4811708279 bytes 56157300 pkt (dropped 12106, overlimits 67131212 requeues 0)
backlog 0b 0p requeues 0
memory used: 1655168b of 4Mb
capacity estimate: 10800Kbit
min/max network layer size: 28 / 1500
min/max overhead-adjusted size: 64 / 1518
average network hdr offset: 14
Tin 0
thresh 10800Kbit
target 5.0ms
interval 100.0ms
pk_delay 552us
av_delay 54us
sp_delay 0us
backlog 0b
pkts 56169406
bytes 4829767780
way_inds 2139688
way_miss 256049
way_cols 0
drops 12106
marks 0
ack_drop 0
sp_flows 0
bk_flows 1
un_flows 0
max_len 15774
quantum 329
qdisc ingress ffff: dev eth1.2 parent ffff:fff1 ----------------
Sent 203652070639 bytes 155213759 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
qdisc mq 0: dev wlan0 root
Sent 62109115485 bytes 45515213 pkt (dropped 0, overlimits 0 requeues 1)
backlog 0b 0p requeues 1
qdisc fq_codel 0: dev wlan0 parent :4 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 wlan0 parent :3 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 62108616977 bytes 45513287 pkt (dropped 0, overlimits 0 requeues 1)
backlog 0b 0p requeues 1
maxpacket 3483 drop_overlimit 0 new_flow_count 91 ecn_mark 0
new_flows_len 0 old_flows_len 1
qdisc fq_codel 0: dev wlan0 parent :2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
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 wlan0 parent :1 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 498508 bytes 1926 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 wlan1 root
Sent 191868196816 bytes 150255023 pkt (dropped 98, overlimits 0 requeues 11)
backlog 0b 0p requeues 11
qdisc fq_codel 0: dev wlan1 parent :4 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 89482591 bytes 233630 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 wlan1 parent :3 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 191776466893 bytes 150017986 pkt (dropped 98, overlimits 0 requeues 11)
backlog 0b 0p requeues 11
maxpacket 3422 drop_overlimit 0 new_flow_count 508 ecn_mark 0
new_flows_len 1 old_flows_len 4
qdisc fq_codel 0: dev wlan1 parent :2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 1945101 bytes 1589 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 wlan1 parent :1 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 302231 bytes 1818 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 8014: dev ifb4eth1.2 root refcnt 2 bandwidth 172Mbit besteffort dual-dsthost nat wash no-ack-filter split-gso rtt 100.0ms noatm overhead 18 mpu 64
Sent 208433917572 bytes 155209852 pkt (dropped 3907, overlimits 128349415 requeues 0)
backlog 0b 0p requeues 0
memory used: 2773220b of 8600000b
capacity estimate: 172Mbit
min/max network layer size: 46 / 1500
min/max overhead-adjusted size: 64 / 1518
average network hdr offset: 14
Tin 0
thresh 172Mbit
target 5.0ms
interval 100.0ms
pk_delay 6.0ms
av_delay 4.5ms
sp_delay 1us
backlog 0b
pkts 155213759
bytes 208439744325
way_inds 8451829
way_miss 256553
way_cols 0
drops 3907
marks 1
ack_drop 0
sp_flows 1
bk_flows 1
un_flows 0
max_len 23804
quantum 1514
