Hello!

> 17.7 wakeups / second.

This is because you had quite large ARP table some time ago,
256 entries or so. The code bothers about latency, not about frequency.


> I want to stress that this is a small desktop-only system without any complex 
> routing setup,
> thus 20 wakeups / seconds seems extreme overkill / bug.

Yes, I saw this too when powertop was announced and I played with it
for a while. I worried about this until I found out that this does not
affect power consumption at all. At least I found no correlation. :-)


> And how to provide further relevant debug output?

Not needed. I will try to repair this and send the patch for testing.

Alexey
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