http://burntchrome.blogspot.com/2014/05/i-dont-like-this-pie-more-bufferbloat.html
PIE certain is better than nothing. But it's no fq_codel.
All I varied between the two is the queuing discipline, with the PIE target (both directions) set to 16ms.
not impressed.
But, far better than pie did when I was in Paris, on a 16Mbps down, 1Mbps up ADSL2+ link:
I think those results were either the default target being wrong, or the highly asynchronous and highly limited setup being ill-suited to PIE. Which is concerning, as PIE is going to be deployed in 30/1 cable setups (like the Numericable.fr setup I had in my first apartment in Paris).
-Aaron