8822cs, 6.16-rc7: very low throughput

[Piotr Oniszczuk <piotr.oniszczuk@xxxxxxxxx>]

Hi,
I'm playing with 8822cs (nanopi-r76s; m2 module; sdio intf) and i'm getting very low throughput on established wifi connections.

my user space is iwd 3.9.
linux-fw is current master.
6.16-rc7 with https://lore.kernel.org/linux-wireless/20250724004815.7043-1-pkshih@xxxxxxxxxxx/T/#u

iwctl shows:

            Scanning              no
            State                 connected
            Connected network     WarpedNET-5
            No IP addresses       Is DHCP client configured?
            ConnectedBss          8c:53:c3:e6:bb:90
            Frequency             5540
            Channel               108
            Security              WPA2-Personal
            RSSI                  -70 dBm
            AverageRSSI           -69 dBm
            TxMode                802.11ac
            TxMCS                 3
            TxBitrate             234000 Kbit/s
            RxBitrate             6000 Kbit/s


user space throughput:

19.08 Mbps (215.894%)
28.36 Mbps (48.6373%)
18.23 Mbps (-35.7193%)
33.45 Mbps (83.4888%)
33.13 Mbps (-0.956652%)
26.24 Mbps (-20.7969%)
24.92 Mbps (-5.03049%)
25.44 Mbps (2.08668%)
23.96 Mbps (-5.81761%)
25.82 Mbps (7.76294%)
30.15 Mbps (16.7699%)
30.72 Mbps (1.89055%)
25.23 Mbps (-17.8711%)


iwd log:

Wireless daemon version 3.9
Loaded configuration from /etc/iwd/main.conf
station: Network configuration is disabled.
[General].UseDefaultInterface is deprecated, please use [DriverQuirks].DefaultInterface instead
Wiphy: 0, Name: phy0
        Permanent Address: 70:68:71:a2:a8:0d
        2.4GHz Band:
                Bitrates (non-HT):
                         1.0 Mbps
                         2.0 Mbps
                         5.5 Mbps
                        11.0 Mbps
                         6.0 Mbps
                         9.0 Mbps
                        12.0 Mbps
                        18.0 Mbps
                        24.0 Mbps
                        36.0 Mbps
                        48.0 Mbps
                        54.0 Mbps
                HT Capabilities:
                        HT40
                        Short GI for 20Mhz
                        Short GI for 40Mhz
                HT RX MCS indexes:
                        0-15
                        32
        5GHz Band:
                Bitrates (non-HT):
                         6.0 Mbps
                         9.0 Mbps
                        12.0 Mbps
                        18.0 Mbps
                        24.0 Mbps
                        36.0 Mbps
                        48.0 Mbps
                        54.0 Mbps
                HT Capabilities:
                        HT40
                        Short GI for 20Mhz
                        Short GI for 40Mhz
                HT RX MCS indexes:
                        0-15
                        32
                VHT Capabilities:
                        Short GI for 80Mhz
                        Max RX MCS: 0-9 for NSS: 2
                        Max TX MCS: 0-9 for NSS: 2
        Ciphers: BIP-CMAC-256 BIP-GMAC-256 BIP-GMAC-128 CCMP-256
                 GCMP-256 GCMP-128 BIP-CMAC-128 CCMP-128
                 TKIP
        Supported iftypes: station
Wiphy phy0 will only use the default interface
event: state, old: disconnected, new: autoconnect_quick
event: connect-info, ssid: WarpedNET-5, bss: 8c:53:c3:e6:bb:90, signal: -73, load: 4/255
event: state, old: autoconnect_full, new: connecting
hardware_rekey not supported
event: state, old: connecting, new: connected


kernel log: https://termbin.com/o16p

1m away macbook gives me 40-45MB/s so issue isn't in my wifi router i think

i'm not sure how to move forward with this.....