[FS#42] Ath9k/mac80211 performance regression (missing data, packet drops) - Task opened

[LEDE Bugs]

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

User who did this - Koen Vandeputte (xback) 

Attached to Project - LEDE Project
Summary - Ath9k/mac80211 performance regression (missing data,  packet drops)
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Since this commit: 67a7daa938671a5c7006e5d689c297a26499d75c
Commit Msg: "mac80211: update to wireless-testing 2016-06-20"

Used hardware:  3x cns3xxx GW2388 + 4x SR-71-15 (ar9280) on each device

Stuff seen:
- Packets not even reaching tcpdump anymore
- Getting STA_INFO from a remote mac using netlink:
* following attributes are not present anymore in the netlink packet:
--> NL80211_STA_INFO_BEACON_SIGNAL_AVG
--> NL80211_STA_INFO_BEACON_LOSS
--> etc.
* Netlink reply packet size
--> Before this commit: ~3kB
--> After this commit: ~1kB


More details will follow .. (debugging at this moment)

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=42