[FS#79] JCG JHR-N926R (rt3052): rt2x00queue_write_tx_frame: Error - Dropping frame due to full tx queue 2

[LEDE Bugs]

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

User who did this - Michael S. (micha) 

Attached to Project - LEDE Project
Summary - JCG JHR-N926R (rt3052): rt2x00queue_write_tx_frame: Error - Dropping frame due to full tx queue 2
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - niedrig
Priority - gering
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Hello!

I am detecting similar Wifi dropping problems as mentioned in ID#34, but other device base. It's an JCG JHR-N926R based on raMIPS/Ralink RT3052.


Model JCG JHR-N926R
Firmware Version LEDE Reboot r733 / LuCI Master (git-16.164.65694-cd50f27)
Kernel Version 4.4.13
Local Time Sat Aug 6 13:58:34 2016
Uptime 5d 0h 54m 24s
root at lede:~# free
             total       used       free     shared    buffers     cached
Mem:         28504      24740       3764        528       1540       4544
-/+ buffers/cache:      18656       9848
Swap:            0          0          0


As long as connected Wifi clients won't create heavy traffic, clients can use the wifi connection somehow. There are random disconnects/reconnects shown in the router log and reported by the android clients (weak wifi).

If a clients (standing beside the router) creates only little surfing traffic LuCI webinterface shows collapsing RX TX bitrates down to nearly zero, immediately. After stopping the traffic RX TX rates are rising back to high values over 100MBit/s.

A few Speedtests or a few IPERF3 tests with the N926R as server breaks the Wifi connection. It is still seen, but no connection is possible anymore for any devices through WiFi (//see system logfile: ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping frame due to full tx queue 2//).

For image creation I used the Image Generator only adding LuCI and IPERF3.

I attached a ZIP file containing some router backup config files, system log, kernel log and iwlist.

Right now the router is in the faulty state. I will let it run till tomorrow for possible console requests to be tried out.

THX
Michael

One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=79