TP-Link Archer C7 v2 slow 5GHz wifi

Installing and Using OpenWrt Network and Wireless Configuration
1

Hello, my 5GHz wifi is quite slow, I get 90 down or even less on my router TP-Link Archer C7 v2 with 19.07.0 (I used the factory image to upgrade it) while I get 200 down with the wifi on my modem with is next to the router.
When I connect the PC with the use of a LAN Cable to the router I get the 200 down.

/etc/config/wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option channel '36'
        option hwmode '11a'
        option path 'pci0000:00/0000:00:00.0'
        option legacy_rates '0'
        option htmode 'VHT80'
        option txpower '20'
        option country 'DE'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option key 'xxxx'
        option ssid 'Dlink5'
        option encryption 'psk2+ccmp'

config wifi-device 'radio1'
        option type 'mac80211'
        option channel '11'
        option hwmode '11g'
        option path 'platform/ahb/ahb:apb/18100000.wmac'
        option legacy_rates '0'
        option txpower '20'
        option country 'DE'
        option htmode 'HT40'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option key 'xxxx'
        option ssid 'Dlink'
        option encryption 'psk2+ccmp'

iw dev wlan0 station dump

        inactive time:  0 ms
        rx bytes:       26696935
        rx packets:     136122
        tx bytes:       599216747
        tx packets:     411561
        tx retries:     5694
        tx failed:      12
        rx drop misc:   3
        signal:         -57 [-60, -60, -68] dBm
        signal avg:     -57 [-60, -60, -68] dBm
        tx bitrate:     117.0 MBit/s VHT-MCS 6 VHT-NSS 2
        rx bitrate:     780.0 MBit/s VHT-MCS 8 80MHz short GI VHT-NSS 2
        rx duration:    2324264 us
        last ack signal:-95 dBm
        authorized:     yes
        authenticated:  yes
        associated:     yes
        preamble:       short
        WMM/WME:        yes
        MFP:            no
        TDLS peer:      no
        DTIM period:    2
        beacon interval:100
        short preamble: yes
        short slot time:yes
        connected time: 386 seconds
2

I get 150 mbps

Probably irrelevant here, but it's sysupgrade image that should be used to upgrade devices in most cases. Using factory image could brick your device.

3

Did you do some spacial stuff or only change the basic settings for the Wireless Network to get this speed?

4

I didn't change anything. The only difference I noticed is that I left the power at driver default (23) while you seem to have at on 20.

Did you install ar71xx or ath79 image?

1 Like
5

How far is your router from your laptop? Mine was like 1.5m from the laptop. You know AC range is short.

Also did you try N band at 5 GHz?

6

I've logged a bug for this device exhibiting high latency when connected to a Microsoft Surface client. The somewhat buggy MS driver is not playing nice with what appears to be hostapd v2.9. See FS#2563. Also, more details at https://forum.openwrt.org/t/zyxel-nbg6617-ipq4019-regression-in-wifi-5ghz/50544/26?u=muddyfeet.

What client are you connecting to the router with?

7

When I tested it, it was a laptop running Windows 10 and connected using the internal WiFi card, some Ath/Q card, but don't recall the exact number.

8

I installed the ath79 image.

It should be 2m.

No improvements.

After I put it to 23 I got ~105 Mbps.

Later this day I will change the router position. I think that the stuff around the router causes problems because the increase of the speed after the increase of the transmission power is quite suspicious and my Modem is above the router and there I get 200Mbps.

A desktop pc with a Intel AX200 card running Windows 10.

9

Update your AX200 drivers here.
Older versions of Intel AX200 drivers have low throughput

1 Like
10

Solved my problem, thanks

11

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