Netgear R7800 exploration (IPQ8065, QCA9984)

[Pedro]

please check:

Possible cause of R7800 latency issues

As far as I can tell the huge 40%-80% cpu spike is gone. Now I only see ~7% spike once in a while across different kworker thread and only observable with htop -d1. With default htop (I think -d20) refresh rate I can only see 0.7% bump once in a while. Not sure what this means to the latency spike though - my firmware still has the timer frequency and voluntary preemption options enabled. My change is a quick dirty hack for testing and I would be ashamed to share the patch out - here's what I …