[FS#3674] WLAN transfer rate drops extreme under high load

[OpenWrt Bugs]

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

User who did this - Gerry K (renegat) 

Attached to Project - OpenWrt/LEDE Project
Summary - WLAN transfer rate drops extreme under high load
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Device problem occurs on: WAVLINK WL-WN577A2 aka Maginon WL-755
Software versions of OpenWrt/LEDE release, packages, etc.: latest Snapshot wavlink_wl-wn577a2-squashfs-sysupgrade.bin

Steps to reproduce:
On Maginon WL-755 with latest snapshot installed try to stream some fullHD video over 2,4GHz to client.
After a short time where it will work the video begins to stutter and finally stopps on client.

Try to transfer a big file (some GB) over 2,4GHz network:
Transferrate will start high (about 90 - 100 Mbit/s, limited by the fast ethernet ports) than drop to < 20 Mbit/s, finally to fewer than 10 Mbit/s.

The issue appears only under high load and transfer speed will return to normal after a while.
   
This issue can be reproduced on a lot of devices with every snapshot published till now.

Perhaps some throttling issue?!
 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3674

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