[FS#563] cake qdisc high cpu usage on tp-link 841n

[LEDE Bugs]

The following task has a new comment added:

FS#563 - cake qdisc high cpu usage on tp-link 841n
User who did this - Weedy (weedy)

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I have a tp-link 842nd using qos-scripts.

I think this is more of a ath9k/memory bug.
My box will grind to a halt after a good chunk of wifi traffic. And haing QoS running or darkstat only makes it happen faster.
Slab fragmentation and ath9k buffers?

I'll have the device back soon and I'll try to bisect it while hammering with iperf/flent.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=563#comment2112