[FS#958] Archer C2600 - high latency over 5GHz wireless & no intermediate software queues

[LEDE Bugs]

The following task has a new comment added:

FS#958 - Archer C2600 - high latency over 5GHz wireless & no intermediate software queues
User who did this - Baptiste Jonglez (bjonglez)

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I don't see a latency issue on 5 GHz on this device, with LEDE 17.01.2.
I have the same fq_codel qdisc you've shown, but that's expected, fq_codel is the default on LEDE.

Config:


config wifi-device 'radio0'
	option type 'mac80211'
	option channel '36'
	option hwmode '11a'
	option path 'soc/1b500000.pci/pci0000:00/0000:00:00.0/0000:01:00.0'
	option htmode 'VHT80'
	option country 'FR'

config wifi-iface 'default_radio0'
	option device 'radio0'
	option network 'lan'
	option mode 'ap'
	option ssid 'SSID'
	option key 'KEY'
	option encryption 'psk2'


Linux client with Intel 2110 wireless card:


# iw dev wlan0 info                                                                                                                                
Interface wlan0                                                                                                                                                        
        ifindex 3
        wdev 0x1
        addr 30:e3:7a:XX:XX:XX
        type managed
        wiphy 0
        channel 36 (5180 MHz), width: 80 MHz, center1: 5210 MHz
        txpower 22.00 dBm
# ping -n 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.96 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.97 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=2.05 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=1.57 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=1.08 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=1.14 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=0.907 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=1.01 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=0.729 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=1.00 ms
64 bytes from 192.168.1.1: icmp_seq=11 ttl=64 time=0.877 ms
64 bytes from 192.168.1.1: icmp_seq=12 ttl=64 time=1.02 ms
64 bytes from 192.168.1.1: icmp_seq=13 ttl=64 time=0.795 ms
64 bytes from 192.168.1.1: icmp_seq=14 ttl=64 time=1.18 ms
64 bytes from 192.168.1.1: icmp_seq=15 ttl=64 time=0.906 ms
64 bytes from 192.168.1.1: icmp_seq=16 ttl=64 time=1.18 ms
64 bytes from 192.168.1.1: icmp_seq=17 ttl=64 time=0.972 ms
64 bytes from 192.168.1.1: icmp_seq=18 ttl=64 time=1.06 ms
64 bytes from 192.168.1.1: icmp_seq=19 ttl=64 time=0.769 ms
64 bytes from 192.168.1.1: icmp_seq=20 ttl=64 time=1.02 ms
64 bytes from 192.168.1.1: icmp_seq=21 ttl=64 time=2.10 ms
64 bytes from 192.168.1.1: icmp_seq=22 ttl=64 time=1.41 ms
64 bytes from 192.168.1.1: icmp_seq=23 ttl=64 time=1.07 ms
64 bytes from 192.168.1.1: icmp_seq=24 ttl=64 time=2.51 ms
64 bytes from 192.168.1.1: icmp_seq=25 ttl=64 time=14.5 ms
64 bytes from 192.168.1.1: icmp_seq=26 ttl=64 time=1.52 ms
64 bytes from 192.168.1.1: icmp_seq=27 ttl=64 time=2.44 ms



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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=958#comment3316