significant throughput drop with the combination of 88W9098 and MCS11

[jun_1]

I'm testing throughput. of 88W9098 WiFi module. When it's set to 2.4GHz and MCS11, the throughput is 0 Mbps for both 1 and 2 antennas though ping runs normally.
When it's set to 5GHz and MCS11, the throughput is 0 Mbps only when the number of antennas is 2. When the number of antennas is set to one, the average throughput fluctuates in the order of tens of Mbps each time it is measured.

Do you have any idea as to the cause of the significant throughput drop with the combination of 88W9098 and MCS11? The Antenna number and MCS configuration is done with mlanutl. The evaluation was conducted in an anechoic chamber.

Evaluation Environment:
〇host machine: i.MX 8MMini-EVK
〇uSD-M.2 adopter: Murata/Embeded Artist,　LBEE0ZZ2WF-USD-M2
〇WiFi Module: Murata/Embeded Artist, 1XL M.2 Module (chipset: 88W9098)
〇Antenna: Molex 1461530050

[shaun_wu]

Hello @jun_1 

txratecfg is not for testing throughput. You may use iperf to test this. 

Best Regards

Shaun

[shaun_wu]

Hello @jun_1 

Could you share detailed commends you issued?

Best Rergards

Shaun

[jun_1]

Thank you for your reply.

Here is a series of commands.

modprobe moal mod_para=nxp/wifi_mod_para.conf
iw reg set JP
iw dev

sudo wpa_supplicant -B -i mlan1 -c /etc/wpa_supplicant.conf -D nl80211
ifconfig mlan1 up
sudo udhcpc -i mlan1

./mlanutl mlan1 txratecfg 3 11 2
./mlanutl mlan1 txratecfg