Hi,
I have a IW611 chipset (in a Murata 2DL, over SDIO-UART) working on an iMX9.
I have 6 active Bluetooth Low Energy connections with the IW611 (the iMX9 being a BLE central). Each connection is sending and receiving 2kbps. This works OK and looks stable.
Subsequently, I enable a Wi-Fi network (802.11n) on the uap0 Wi-Fi access point interface. I connect 1 Wi-Fi station to the access point. Then, I start a iperf3 TCP stream from the station to the AP. This does not work. More concretely, the throughput is 0 (or very rarely is higher than 0 Mbit/s). The BLE connections (and throughputs) remain OK.
Additionally, I also tested increasing the number of BLE connections incrementally.
- starting 0 active BLE connections: expected RX throughput of ~ 50 Mbits/s
- 1 active BLE connection: throughput drops to ~ 10 - 20 Mbits/s
- 2 active BLE connections: throughput drops to 0 Mbits/s
- 3 active BLE connections: throughput drops to 0 Mbits/s
- ...
- 6 active BLE connections: throughput drops to 0 Mbits/s
I also tried receiving data as Wi-Fi station (mlan0) with 6 active BLE connections, with similar results.
In contrast, when using the Wi-Fi mlan0 (station) or uap0 (AP) to transmit data to another AP or station, while maintaining 6 active BLE connections, it can still reach up to 20 Mbits/s (although the throughput varies a lot).
The NXP Wireless SoC Features and Release Notes for Linux state that the Wi-Fi access point should support 16 stations, and the number of BLE connections should also be 16. I understand that it probably not possible to reach 16 for both (so 32 combined) and reach high throughput. But I was not expecting that 7 connections (1 for Wi-Fi and 6 for BLE) would cause a 0 Mbits/s RX Wi-Fi throughput (while the BLE connections keeps working stable BTW).
Is this Wi-Fi RX drop to 0 Mbits/s expected behavior?
Kind regards,
ac_gd
