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Title: [ROC-RK3568-PC][Wifi] Bandwith limited to 20MHz [Print This Page]

Author: valentinsqn Time: 2/5/2022 01:06
Title: [ROC-RK3568-PC][Wifi] Bandwith limited to 20MHz
I have the following issue with the wifi module AP6275S: I am trying to run an access point in wifi ac mode but I when running iperf I saw the throughput is always around 125mbps. When running iw list I saw that in the capabilities only 20MHz bandwith is supported, which I think it may explain the issue:

iw list
Wiphy phy0
      wiphy index: 0
      max # scan SSIDs: 10
      max scan IEs length: 2048 bytes
      max # sched scan SSIDs: 0
      max # match sets: 0
      max # scan plans: 1
      max scan plan interval: -1
      max scan plan iterations: 0
      Retry short limit: 7
      Retry long limit: 4
      Coverage class: 0 (up to 0m)
      Device supports roaming.
      Device supports T-DLS.
      Available Antennas: TX 0 RX 0
      Supported interface modes:
               * IBSS
               * managed
               * AP
               * P2P-client
               * P2P-GO
               * P2P-device
      Band 1:
            Capabilities: 0x1020
                     HT20
                     Static SM Power Save
                     RX HT20 SGI
                     No RX STBC
                     Max AMSDU length: 3839 bytes
                     DSSS/CCK HT40
            Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
            Minimum RX AMPDU time spacing: 16 usec (0x07)
            HT RX MCS rate indexes supported: 0-7
            HT TX MCS rate indexes are undefined
            Frequencies:
                     * 2412 MHz [1] (20.0 dBm)
                     * 2417 MHz [2] (20.0 dBm)
                     * 2422 MHz [3] (20.0 dBm)
                     * 2427 MHz [4] (20.0 dBm)
                     * 2432 MHz [5] (20.0 dBm)
                     * 2437 MHz [6] (20.0 dBm)
                     * 2442 MHz [7] (20.0 dBm)
                     * 2447 MHz [8] (20.0 dBm)
                     * 2452 MHz [9] (20.0 dBm)
                     * 2457 MHz [10] (20.0 dBm)
                     * 2462 MHz [11] (20.0 dBm)
                     * 2467 MHz [12] (20.0 dBm)
                     * 2472 MHz [13] (20.0 dBm)
      Band 2:
            Capabilities: 0x1020
                     HT20
                     Static SM Power Save
                     RX HT20 SGI
                     No RX STBC
                     Max AMSDU length: 3839 bytes
                     DSSS/CCK HT40
            Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
            Minimum RX AMPDU time spacing: 16 usec (0x07)
            HT RX MCS rate indexes supported: 0-7
            HT TX MCS rate indexes are undefined
            VHT Capabilities (0x0f815832):
                     Max MPDU length: 11454
                     Supported Channel Width: neither 160 nor 80+80
                     RX LDPC
                     short GI (80 MHz)
                     SU Beamformer
                     SU Beamformee
            VHT RX MCS set:
                     1 streams: MCS 0-9
                     2 streams: MCS 0-9
                     3 streams: not supported
                     4 streams: not supported
                     5 streams: not supported
                     6 streams: not supported
                     7 streams: not supported
                     8 streams: not supported
            VHT RX highest supported: 0 Mbps
            VHT TX MCS set:
                     1 streams: MCS 0-9
                     2 streams: MCS 0-9
                     3 streams: not supported
                     4 streams: not supported
                     5 streams: not supported
                     6 streams: not supported
                     7 streams: not supported
                     8 streams: not supported
            VHT TX highest supported: 0 Mbps
            Frequencies:
                     * 5180 MHz [36] (0.0 dBm)
                     * 5200 MHz [40] (0.0 dBm)
                     * 5220 MHz [44] (0.0 dBm)
                     * 5240 MHz [48] (0.0 dBm)
                     * 5260 MHz [52] (0.0 dBm)
                     * 5280 MHz [56] (0.0 dBm)
                     * 5300 MHz [60] (0.0 dBm)
                     * 5320 MHz [64] (0.0 dBm)
                     * 5745 MHz [149] (0.0 dBm)
                     * 5765 MHz [153] (0.0 dBm)
                     * 5785 MHz [157] (0.0 dBm)
                     * 5805 MHz [161] (0.0 dBm)
                     * 5825 MHz [165] (0.0 dBm)
      valid interface combinations:
               * #{ AP } <= 2, #{ managed } <= 4, #{ P2P-client, P2P-GO } <= 2, #{ P2P-device } <= 1, #{
IBSS } <= 1,
               total <= 5, #channels <= 2
      Supported extended features:
            * [ LOW_SPAN_SCAN ]: low span scan
            * [ LOW_POWER_SCAN ]: low power scan
            * [ HIGH_ACCURACY_SCAN ]: high accuracy scan

Is this expected? I would expect to see at least HT20/HT40. Of course I set hw_mode=1 in hostapd but had no success.

I saw the following kernel messages during boot:
[ 17.291957] [dhd] dhd_conf_set_path_params : Final fw_path=/vendor/etc/firmware/fw_bcm43752a2_ag.bin
[ 17.292008] [dhd] dhd_conf_set_path_params : Final clm_path=/vendor/etc/firmware/clm_bcm43752a2_ag.blob
[ 17.293991] dhd_os_open_image1: /vendor/etc/firmware/fw_bcm43752a2_ag.bin (743607 bytes) open success
[ 17.490209] dhd_os_open_image1: /vendor/etc/firmware/clm_bcm43752a2_ag.blob (28865 bytes) open success

Is the bandwith limited because of loading this firmware? Should I update my kernel to a one containing this patch https://patchwork.kernel.org/pro ... 9-2-angus@akkea.ca/ to be able to increase wifi's throughput?

Thanks in advance.

Valentin

Author: Javier Time: 2/10/2022 10:55
Hello, did you use openwrt system? openwrt of 3568 supports HT20 and HT40, so it is not the issure to kernel.
so you can try to edit your hostapd.conf, set hw_mode to "g". this is a hostapd.conf for openwrt for examples:

driver=nl80211
logger_syslog=127
logger_syslog_level=2
logger_stdout=127
logger_stdout_level=2
country_code=US
ieee80211d=1
hw_mode=g
supported_rates=60 90 120 180 240 360 480 540
basic_rates=60 120 240
beacon_int=100
dtim_period=2
channel=1
chanlist=1
ieee80211n=1
ht_coex=0
radio_config_id=570b89ac214840092cda49c8238746df
interface=wlan0
ctrl_interface=/var/run/hostapd
ap_isolate=1
disassoc_low_ack=0
skip_inactivity_poll=0
preamble=1
wmm_enabled=1
ignore_broadcast_ssid=0
uapsd_advertisement_enabled=1
utf8_ssid=1
multi_ap=0
auth_algs=1
wpa=0
ssid=OpenWRT-95D4
bridge=br-lan
wds_bridge=
snoop_iface=br-lan
config_id=fa5f1619a6f9b1243fc2d154a4127dc4
bssid=00:00:00:00:00:00

Copy the code

Author: valentinsqn Time: 2/10/2022 17:45
Hi Javier,

I also tried openwrt image (Station_P2_OpenWRT_GPT_20211123_1812.img), however 'iw list' still only shows HT20 in capabilities. I am not trying to do wifi g but wifi ac, which is supposed to be supported.

Also patched 4.19 kernel to use dhd driver in wifi5 instead of wifi6 but capabilities are the same, I guess the issue comes from fw_bcm43752a2_ag.bin but no one has confirmed it yet.

Author: Liuth Time: 3/3/2022 11:14
you can try the newest firmware,which date is 20220222
OR you can fix the bug manually，delete this freq-limit in rk3568-firefly-roc-pc.dtsi :

&sdmmc2 {
status = "okay";
- max-frequency = <100000000>;
};

Copy the code

this may help

Author: valentinsqn Time: 3/3/2022 16:55
I've just flashed ROC-RK3568-PC-UBUNTU18.04-GPT-20220222-1540.img:
root@firefly:~# uname -a
Linux firefly 4.19.219 #370 SMP Tue Feb 22 15:35:10 CST 2022 aarch64 aarch64 aarch64 GNU/Linux

However I still see the same output of iw list:

Band 1:
            Capabilities: 0x1020
                     HT20
                     Static SM Power Save
                     RX HT20 SGI
                     No RX STBC
                     Max AMSDU length: 3839 bytes
                     DSSS/CCK HT40
...
...
...
Band 2:
            Capabilities: 0x1020
                     HT20
                     Static SM Power Save
                     RX HT20 SGI
                     No RX STBC
                     Max AMSDU length: 3839 bytes
                     DSSS/CCK HT40

I would expect at least HT20/HT40

Author: Liuth Time: 3/3/2022 17:27

firmware.zip (868.8 KB, Down times: 15)
try this new wifi firmware, put them under /vendor/etc/firmware/
and reboot the device

Author: valentinsqn Time: 3/3/2022 18:40
Thanks, it is better, around ~240mbps, however I'm still limited because of supported bandwidth. I cannot setup HT40+ in hostapd.conf because the capability is not supported

Author: Javier Time: 3/7/2022 14:33
please use wl to show wifi status
```
root@FusionWrt:~# ./wl status
SSID: "OpenWRT-A046"
Mode: Managed RSSI: 0 dBm    SNR: 0 dB    noise: -95 dBm  Channel: 36/80
BSSID: 10:2C:6B:7F:A0:46       Capability: ESS
Supported Rates: [ 6(b) 9 12(b) 18 24(b) 36 48 54 ]
VHT Capable:
      Chanspec: 5GHz channel 42 80MHz (0xe02a)
      Primary channel: 36
      HT Capabilities:
      Supported MCS : [ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ]
      VHT Capabilities:
      Supported VHT (tx) Rates:
            NSS: 1 MCS: 0-9
            NSS: 2 MCS: 0-9
      Supported VHT (rx) Rates:
            NSS: 1 MCS: 0-9
            NSS: 2 MCS: 0-9

```

wl.zip

268.46 KB, Down times: 11

Author: whoopfiber Time: 11/23/2022 18:38

Javier Posted at 3/7/2022 14:33
please use wl to show wifi status
```
root@FusionWrt:~# ./wl status

It worked for me. Thanks.

happy wheels

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