[FS#970] mwl8k wireless driver sta mode maxed out sirq at low throughput

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Kin (kchan345) 

Attached to Project - LEDE Project
Summary - mwl8k wireless driver sta mode maxed out sirq at low throughput
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - router: linksys ea4500v1
lede version: 17.01.2 (https://downloads.lede-project.org/releases/17.01.2/targets/kirkwood/generic/lede-17.01.2-kirkwood-linksys-viper-squashfs-factory.bin)

Observation:
1)
wireless client: EA4500 using STA mode on 5ghz radio
wireless AP: linksys wrt1900acv1 using AP mode on 5ghz radio
setup: iperf client  EA4500  wrt1900acv1  iperf server

iperf result:
38 Mbps with EA4500 sirq maxing out at 99%

2)
wireless client: EA4500 using STA mode on 2.4ghz radio
wireless AP: asus rtn12d1 using AP mode on 2.4ghz radio
setup: iperf client  EA4500  rtn12d1  iperf server

iperf result:
38 Mbps with EA4500 sirq maxing out at 99% 

3)
wireless client: samsung galaxy note 5
wireless AP: EA4500 in AP mode on 5ghz radio
setup: iperf client  EA4500  iperf server

iperf result:
142 Mbps with EA4500 sirq around 58%

4)
wireless client: samsung galaxy note 5
wireless AP: linksyswrt1900acv1
setup iperf client linksyswrt1900acv1  iperf server

iperf result
~220 Mbps

So the low throughput seems to be a problem specifically with EA4500 (mwl8k driver) using STA mode. 


More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=970