Hello everyone,
I have SQM set up on my Archer C20 v5 with OpenWRT (its connected as second router to my ISP provielded ONT). I have selected the eth interface for the SQM but I am not sure if it works because the WiFi devices often cause alot of jitters in games on my PC (connected via LAN). So, should I apply the SQM on the wlan interface instead of wan?
P. S Only the PC is connected to ethernet port, rest of the devices are all connected via WiFi.
You enable SQM/QoS on the wan link, which usually is the one that has lower throughput than the lan.
There can be other reasons for that. Interference, noisy environment, channel congestion, obstacles, and the list goes on.
What I actually meant was that whenever 2-3 WiFi devices started streaming, the games on my PC became jittery (which is connected via LAN). My Internet is 15/15 and ingress and egress are set to 13000.
Have you measured the maximum throughput your wifi can get? If not give it a try with iperf. However I am pretty sure that it will be more than 15 Mbps symmetrical, so some host streaming from the internet won't saturate the wifi. Also verify the connection speed for all the wireless hosts. If they connect at low speeds, or even legacy speeds, they can affect the overall performance of the AP.
Apologies if my original post was misleading as I was talking about gaming on my PC which is connected via LAN rather than any of the wifi devices.
Ok, so to recap: You have the gaming PC connected to LAN port and 2-3 wifi hosts. When the wifi hosts are not downloading, everything is working fine. But when they start streaming something from the internet, your connection to the game server lags/jitters. Is this right? Something to add/remove?
Correct. No issues when there are no other devices using the bandwidth.
Alright, can you follow the troubleshooting steps mentioned here?
Please use the "Preformatted text </>" button for logs, scripts, configs and general console output.
root@OpenWrt:~# cat /etc/config/sqm
config queue 'eth1'
option qdisc_advanced '0'
option debug_logging '0'
option verbosity '5'
option qdisc 'cake'
option script 'piece_of_cake.qos'
option linklayer 'ethernet'
option overhead '44'
option enabled '1'
option interface 'eth0.2'
option download '13000'
option upload '13000'
root@OpenWrt:~# ifstatus wan
{
"up": true,
"pending": false,
"available": true,
"autostart": true,
"dynamic": false,
"uptime": 2850553,
"l3_device": "eth0.2",
"proto": "dhcp",
"device": "eth0.2",
"metric": 0,
"dns_metric": 0,
"delegation": true,
"ipv4-address": [
{
"address": "192.168.1.10",
"mask": 24
}
],
"ipv6-address": [
],
"ipv6-prefix": [
],
"ipv6-prefix-assignment": [
],
"route": [
{
"target": "0.0.0.0",
"mask": 0,
"nexthop": "192.168.1.1",
"source": "192.168.1.10/32"
}
],
"dns-server": [
"192.168.1.1"
],
"dns-search": [
],
"neighbors": [
],
"inactive": {
"ipv4-address": [
],
"ipv6-address": [
],
"route": [
],
"dns-server": [
],
"dns-search": [
],
"neighbors": [
]
},
"data": {
"leasetime": 86400
}
}
root@OpenWrt:~# 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
/usr/lib/sqm/run.sh: line 57: can't create : nonexistent directory
SQM: Stopping SQM on eth0.2
/usr/lib/sqm/run.sh: line 57: can't create : nonexistent directory
SQM: Starting SQM script: piece_of_cake.qos on eth0.2, in: 13000 Kbps, out: 13000 Kbps
SQM: fn_exists: function candidate name: sqm_start
SQM: fn_exists: TYPE_OUTPUT: sqm_start: not found
SQM: fn_exists: return value: 1
SQM: Using generic sqm_start_default function.
SQM: fn_exists: function candidate name: sqm_prepare_script
SQM: fn_exists: TYPE_OUTPUT: sqm_prepare_script is a function
SQM: fn_exists: return value: 0
SQM: sqm_start_default: starting sqm_prepare_script
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: 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: sqm_start_default: Starting piece_of_cake.qos
SQM: ifb associated with interface eth0.2:
SQM: Currently no ifb is associated with eth0.2, this is normal during starting of the sqm system.
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link add name ifb4eth0.2 type ifb
SQM: fn_exists: function candidate name: egress
SQM: fn_exists: TYPE_OUTPUT: egress is a function
SQM: fn_exists: return value: 0
SQM: egress
SQM: cmd_wrapper: tc: invocation silenced by request, FAILURE either expected or acceptable.
SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev eth0.2 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 eth0.2 root cake bandwidth 13000kbit overhead 44 mpu 0 besteffort
SQM: sqm_start_default: 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: fn_exists: function candidate name: ingress
SQM: fn_exists: TYPE_OUTPUT: ingress is a function
SQM: fn_exists: return value: 0
SQM: ingress
SQM: cmd_wrapper: tc: invocation silenced by request, FAILURE either expected or acceptable.
SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev eth0.2 handle ffff: ingress
SQM: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: Invalid argument
SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev eth0.2 handle ffff: ingress
SQM: cmd_wrapper: tc: invocation silenced by request, FAILURE either expected or acceptable.
SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev ifb4eth0.2 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 ifb4eth0.2 root cake bandwidth 13000kbit overhead 44 mpu 0 besteffort wash
SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev ifb4eth0.2 up
SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc filter add dev eth0.2 parent ffff: protocol all prio 10 u32 match u32 0 0 flowid 1:1 action mirred egress redirect dev ifb4eth0.2
SQM: sqm_start_default: ingress shaping activated
SQM: piece_of_cake.qos was started on eth0.2 successfully
root@OpenWrt:~# logread | grep SQM
Fri Aug 21 15:13:25 2020 user.notice SQM: Stopping SQM on eth0.2
Fri Aug 21 15:13:25 2020 user.notice SQM: Starting SQM script: piece_of_cake.qos on eth0.2, in: 13000 Kbps, out: 13000 Kbps
Fri Aug 21 15:13:25 2020 user.notice SQM: Using generic sqm_start_default function.
Fri Aug 21 15:13:26 2020 user.notice SQM: piece_of_cake.qos was started on eth0.2 successfully
Fri Aug 21 15:48:47 2020 user.notice SQM: Stopping SQM on eth0.2
Fri Aug 21 15:48:47 2020 user.notice SQM: Starting SQM script: piece_of_cake.qos on wlan0, in: 8000 Kbps, out: 8000 Kbps
Fri Aug 21 15:48:47 2020 user.notice SQM: Using generic sqm_start_default function.
Fri Aug 21 15:48:48 2020 user.notice SQM: piece_of_cake.qos was started on wlan0 successfully
Fri Aug 21 16:11:08 2020 user.notice SQM: Stopping SQM on wlan0
Fri Aug 21 16:11:08 2020 user.notice SQM: Starting SQM script: piece_of_cake.qos on wlan0, in: 8000 Kbps, out: 0 Kbps
Fri Aug 21 16:11:08 2020 user.notice SQM: Using generic sqm_start_default function.
Fri Aug 21 16:11:09 2020 user.notice SQM: piece_of_cake.qos was started on wlan0 successfully
Fri Aug 21 16:12:29 2020 user.notice SQM: Stopping SQM on wlan0
Fri Aug 21 16:12:29 2020 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev wlan0 root
Fri Aug 21 16:12:29 2020 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Fri Aug 21 16:12:30 2020 user.notice SQM: Starting SQM script: piece_of_cake.qos on wlan0, in: 8000 Kbps, out: 8000 Kbps
Fri Aug 21 16:12:30 2020 user.notice SQM: Using generic sqm_start_default function.
Fri Aug 21 16:12:31 2020 user.notice SQM: piece_of_cake.qos was started on wlan0 successfully
Fri Aug 21 16:56:36 2020 user.notice SQM: Stopping SQM on wlan0
Fri Aug 21 16:56:37 2020 user.notice SQM: Starting SQM script: piece_of_cake.qos on eth0.2, in: 13500 Kbps, out: 13500 Kbps
Fri Aug 21 16:56:37 2020 user.notice SQM: Using generic sqm_start_default function.
Fri Aug 21 16:56:38 2020 user.notice SQM: piece_of_cake.qos was started on eth0.2 successfully
Fri Aug 21 18:19:54 2020 user.notice SQM: Stopping SQM on eth0.2
Fri Aug 21 18:19:54 2020 user.notice SQM: Starting SQM script: piece_of_cake.qos on eth0.2, in: 13000 Kbps, out: 13000 Kbps
Fri Aug 21 18:19:54 2020 user.notice SQM: Using generic sqm_start_default function.
Fri Aug 21 18:19:55 2020 user.notice SQM: piece_of_cake.qos was started on eth0.2 successfully
Fri Aug 21 19:20:13 2020 user.notice SQM: Stopping SQM on eth0.2
Fri Aug 21 19:20:14 2020 user.notice SQM: Starting SQM script: piece_of_cake.qos on eth0.2, in: 13000 Kbps, out: 13000 Kbps
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: function candidate name: sqm_start
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: TYPE_OUTPUT: sqm_start: not found
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: return value: 1
Fri Aug 21 19:20:14 2020 user.notice SQM: Using generic sqm_start_default function.
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: function candidate name: sqm_prepare_script
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: TYPE_OUTPUT: sqm_prepare_script is a function
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: return value: 0
Fri Aug 21 19:20:14 2020 user.notice SQM: sqm_start_default: starting sqm_prepare_script
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link add name TMP_IFB_4_SQM type ifb
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM root cake
Fri Aug 21 19:20:14 2020 user.notice SQM: QDISC cake is useable.
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev TMP_IFB_4_SQM down
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link delete TMP_IFB_4_SQM type ifb
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link add name TMP_IFB_4_SQM type ifb
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM root cake
Fri Aug 21 19:20:14 2020 user.notice SQM: QDISC cake is useable.
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev TMP_IFB_4_SQM down
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link delete TMP_IFB_4_SQM type ifb
Fri Aug 21 19:20:14 2020 user.notice SQM: sqm_start_default: Starting piece_of_cake.qos
Fri Aug 21 19:20:14 2020 user.notice SQM: ifb associated with interface eth0.2:
Fri Aug 21 19:20:14 2020 user.notice SQM: Currently no ifb is associated with eth0.2, this is normal during starting of the sqm system.
Fri Aug 21 19:20:14 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link add name ifb4eth0.2 type ifb
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: function candidate name: egress
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: TYPE_OUTPUT: egress is a function
Fri Aug 21 19:20:14 2020 user.notice SQM: fn_exists: return value: 0
Fri Aug 21 19:20:15 2020 user.notice SQM: egress
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: invocation silenced by request, FAILURE either expected or acceptable.
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev eth0.2 root
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Fri Aug 21 19:20:15 2020 user.notice SQM: LLA: default link layer adjustment method for cake is cake
Fri Aug 21 19:20:15 2020 user.notice SQM: cake link layer adjustments: overhead 44 mpu 0
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev eth0.2 root cake bandwidth 13000kbit overhead 44 mpu 0 besteffort
Fri Aug 21 19:20:15 2020 user.notice SQM: sqm_start_default: egress shaping activated
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link add name TMP_IFB_4_SQM type ifb
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM ingress
Fri Aug 21 19:20:15 2020 user.notice SQM: QDISC ingress is useable.
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev TMP_IFB_4_SQM down
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link delete TMP_IFB_4_SQM type ifb
Fri Aug 21 19:20:15 2020 user.notice SQM: fn_exists: function candidate name: ingress
Fri Aug 21 19:20:15 2020 user.notice SQM: fn_exists: TYPE_OUTPUT: ingress is a function
Fri Aug 21 19:20:15 2020 user.notice SQM: fn_exists: return value: 0
Fri Aug 21 19:20:15 2020 user.notice SQM: ingress
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: invocation silenced by request, FAILURE either expected or acceptable.
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev eth0.2 handle ffff: ingress
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: Invalid argument
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev eth0.2 handle ffff: ingress
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: invocation silenced by request, FAILURE either expected or acceptable.
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc del dev ifb4eth0.2 root
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Fri Aug 21 19:20:15 2020 user.notice SQM: LLA: default link layer adjustment method for cake is cake
Fri Aug 21 19:20:15 2020 user.notice SQM: cake link layer adjustments: overhead 44 mpu 0
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc qdisc add dev ifb4eth0.2 root cake bandwidth 13000kbit overhead 44 mpu 0 besteffort wash
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: ip: SUCCESS: /sbin/ip link set dev ifb4eth0.2 up
Fri Aug 21 19:20:15 2020 user.notice SQM: cmd_wrapper: tc: SUCCESS: /usr/sbin/tc filter add dev eth0.2 parent ffff: protocol all prio 10 u32 match u32 0 0 flowid 1:1 action mirred egress redirect dev ifb4eth0.2
Fri Aug 21 19:20:15 2020 user.notice SQM: sqm_start_default: ingress shaping activated
Fri Aug 21 19:20:15 2020 user.notice SQM: piece_of_cake.qos was started on eth0.2 successfully
root@OpenWrt:~# tc -d qdisc
qdisc noqueue 0: dev lo root refcnt 2
qdisc fq_codel 0: dev eth0 root refcnt 2 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 eth0.1 root refcnt 2
qdisc cake 803c: dev eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
qdisc ingress ffff: dev eth0.2 parent ffff:fff1 ----------------
qdisc noqueue 0: dev wlan0 root refcnt 2
qdisc cake 803d: dev ifb4eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat wash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
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 fq_codel 0: dev eth0 root refcnt 2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 422862080935 bytes 662610830 pkt (dropped 5, overlimits 0 requeues 11577)
backlog 0b 0p requeues 11577
maxpacket 1514 drop_overlimit 0 new_flow_count 28151 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 803c: dev eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
Sent 290283 bytes 1285 pkt (dropped 1, overlimits 209 requeues 0)
backlog 0b 0p requeues 0
memory used: 24192b of 4Mb
capacity estimate: 13Mbit
min/max network layer size: 28 / 1492
min/max overhead-adjusted size: 72 / 1536
average network hdr offset: 14
Tin 0
thresh 13Mbit
target 5.0ms
interval 100.0ms
pk_delay 6.5ms
av_delay 614us
sp_delay 14us
backlog 0b
pkts 1286
bytes 291789
way_inds 0
way_miss 138
way_cols 0
drops 1
marks 0
ack_drop 0
sp_flows 1
bk_flows 1
un_flows 0
max_len 1881
quantum 396
qdisc ingress ffff: dev eth0.2 parent ffff:fff1 ----------------
Sent 454408 bytes 1202 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 cake 803d: dev ifb4eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat wash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
Sent 470202 bytes 1201 pkt (dropped 1, overlimits 334 requeues 0)
backlog 0b 0p requeues 0
memory used: 22696b of 4Mb
capacity estimate: 13Mbit
min/max network layer size: 46 / 1492
min/max overhead-adjusted size: 90 / 1536
average network hdr offset: 14
Tin 0
thresh 13Mbit
target 5.0ms
interval 100.0ms
pk_delay 2.5ms
av_delay 153us
sp_delay 25us
backlog 0b
pkts 1202
bytes 471616
way_inds 0
way_miss 138
way_cols 0
drops 1
marks 0
ack_drop 0
sp_flows 1
bk_flows 1
un_flows 0
max_len 2828
quantum 396
After generating some traffic:
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 fq_codel 0: dev eth0 root refcnt 2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 422902931245 bytes 662658649 pkt (dropped 5, overlimits 0 requeues 11577)
backlog 0b 0p requeues 11577
maxpacket 1514 drop_overlimit 0 new_flow_count 28151 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 8040: dev eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
Sent 6432 bytes 35 pkt (dropped 0, overlimits 2 requeues 0)
backlog 0b 0p requeues 0
memory used: 2240b of 4Mb
capacity estimate: 13Mbit
min/max network layer size: 28 / 1323
min/max overhead-adjusted size: 72 / 1367
average network hdr offset: 2
Tin 0
thresh 13Mbit
target 5.0ms
interval 100.0ms
pk_delay 181us
av_delay 5us
sp_delay 5us
backlog 0b
pkts 35
bytes 6432
way_inds 0
way_miss 9
way_cols 0
drops 0
marks 0
ack_drop 0
sp_flows 1
bk_flows 1
un_flows 0
max_len 1337
quantum 396
qdisc ingress ffff: dev eth0.2 parent ffff:fff1 ----------------
Sent 7224 bytes 42 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 cake 8041: dev ifb4eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat wash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
Sent 7852 bytes 42 pkt (dropped 0, overlimits 10 requeues 0)
backlog 0b 0p requeues 0
memory used: 4032b of 4Mb
capacity estimate: 13Mbit
min/max network layer size: 46 / 1470
min/max overhead-adjusted size: 90 / 1514
average network hdr offset: 2
Tin 0
thresh 13Mbit
target 5.0ms
interval 100.0ms
pk_delay 573us
av_delay 14us
sp_delay 14us
backlog 0b
pkts 42
bytes 7852
way_inds 0
way_miss 11
way_cols 0
drops 0
marks 0
ack_drop 0
sp_flows 1
bk_flows 1
un_flows 0
max_len 1567
quantum 396
Something seems odd here. The "after generating some traffic" stats have less bytes count.
@dlakelan @moeller0 @mk24 anything unusual in tc or the SQM debug message /usr/lib/sqm/run.sh: line 57: can't create : nonexistent directory ?
I re ran the last command for verification.
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 fq_codel 0: dev eth0 root refcnt 2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 422941392644 bytes 662843709 pkt (dropped 5, overlimits 0 requeues 11577)
backlog 0b 0p requeues 11577
maxpacket 1514 drop_overlimit 0 new_flow_count 28151 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 8040: dev eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
Sent 12768850 bytes 107245 pkt (dropped 7, overlimits 3702 requeues 0)
backlog 0b 0p requeues 0
memory used: 55520b of 4Mb
capacity estimate: 13Mbit
min/max network layer size: 28 / 1492
min/max overhead-adjusted size: 72 / 1536
average network hdr offset: 14
Tin 0
thresh 13Mbit
target 5.0ms
interval 100.0ms
pk_delay 3.0ms
av_delay 181us
sp_delay 15us
backlog 0b
pkts 107252
bytes 12777112
way_inds 726
way_miss 1444
way_cols 0
drops 7
marks 0
ack_drop 0
sp_flows 0
bk_flows 1
un_flows 0
max_len 4362
quantum 396
qdisc ingress ffff: dev eth0.2 parent ffff:fff1 ----------------
Sent 115501441 bytes 147981 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 cake 8041: dev ifb4eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat wash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
Sent 116392638 bytes 147121 pkt (dropped 860, overlimits 134089 requeues 0)
backlog 0b 0p requeues 0
memory used: 161280b of 4Mb
capacity estimate: 13Mbit
min/max network layer size: 46 / 1492
min/max overhead-adjusted size: 90 / 1536
average network hdr offset: 14
Tin 0
thresh 13Mbit
target 5.0ms
interval 100.0ms
pk_delay 4.6ms
av_delay 823us
sp_delay 39us
backlog 0b
pkts 147981
bytes 117641199
way_inds 539
way_miss 1459
way_cols 0
drops 860
marks 0
ack_drop 0
sp_flows 0
bk_flows 1
un_flows 0
max_len 4502
quantum 396
After generating traffic:
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 fq_codel 0: dev eth0 root refcnt 2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 4Mb ecn
Sent 422976006877 bytes 662881353 pkt (dropped 5, overlimits 0 requeues 11577)
backlog 0b 0p requeues 11577
maxpacket 1514 drop_overlimit 0 new_flow_count 28151 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 8040: dev eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
Sent 30761973 bytes 126770 pkt (dropped 12, overlimits 22752 requeues 0)
backlog 0b 0p requeues 0
memory used: 116318b of 4Mb
capacity estimate: 13Mbit
min/max network layer size: 28 / 1492
min/max overhead-adjusted size: 72 / 1536
average network hdr offset: 14
Tin 0
thresh 13Mbit
target 5.0ms
interval 100.0ms
pk_delay 5.1ms
av_delay 917us
sp_delay 29us
backlog 0b
pkts 126782
bytes 30777765
way_inds 770
way_miss 1530
way_cols 0
drops 12
marks 0
ack_drop 0
sp_flows 1
bk_flows 1
un_flows 0
max_len 4518
quantum 396
qdisc ingress ffff: dev eth0.2 parent ffff:fff1 ----------------
Sent 132166398 bytes 166312 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 cake 8041: dev ifb4eth0.2 root refcnt 2 bandwidth 13Mbit besteffort triple-isolate nonat wash no-ack-filter split-gso rtt 100.0ms noatm overhead 44
Sent 133096061 bytes 165304 pkt (dropped 1008, overlimits 155019 requeues 0)
backlog 0b 0p requeues 0
memory used: 161280b of 4Mb
capacity estimate: 13Mbit
min/max network layer size: 46 / 1492
min/max overhead-adjusted size: 90 / 1536
average network hdr offset: 14
Tin 0
thresh 13Mbit
target 5.0ms
interval 100.0ms
pk_delay 97us
av_delay 19us
sp_delay 11us
backlog 0b
pkts 166312
bytes 134564990
way_inds 539
way_miss 1545
way_cols 0
drops 1008
marks 0
ack_drop 0
sp_flows 1
bk_flows 1
un_flows 0
max_len 4502
quantum 396
this seems to be pretty good. Was this with the kind of wifi traffic you were having trouble with?
There may be more of a CPU limit here, but 13Mbps isn't that much.
1 Like
Unfortunately at that time there wasn't any significant Wi-Fi traffic. I will try to replicate the issue and report back. Thanks for your response.
Just for the info, what is the advantage of running SQM on LAN side as well (along with WAN)? should I enable it on WLAN interface to further limit the WIFI devices without affecting my LAN PC?
You can limit the wifi interface, but it's not necessarily the right option at this point. I think we need a test where you start up some streaming or something on several wifi clients, and run continuous pings from your wired device... see what happens.
1 Like
Will test it out.
Yes, please try. Typically the idea is that with OpenWrt's default fq_codel on an BQL enabled network interface (or an airtime fairness enabled wifi interface) things are well latency/bufferbloat wise, and that leaves the WAN interface which needs care, especially since BQL typically is either not implemented in the DSL or DOCSIS-modem or if using an ethernet based router, might be implemented, but does not trigger (either because the ISP side dies not use BQL/fq_codel, or because on egress the internet access speed is way below the ethernet link speed to the modem, so BQL never engages...
I see. But I am using the cake/piece of cake method if that matters.
On the wan side that is fine, the BQL+fq_codel combination is what ideally happens by default on any ethernet interface in OpenWrt (and AQL instead of BQL on more and ore wifi interfaces). I wonder whether in your case cake's per internal fairness modes, as described in the sing and dance section might not help remedy your issue, as this should limit your wifi users influence on your gaming (unless your router's CPU is already maxed out, in which case problems might persist).
Thanks for the technical heads up. I will try to recreate the jitters and report back with the results.