> On 30 Mar, 2017, at 10:46, Bob Briscoe <[email protected]> wrote:
> 
> For PI2 we removed all but 2 and it worked the same or better than PIE in all 
> our tests. I have been assessing each of the other 7 one by one for 
> reinstatement. So far I've rejected 6. I think I can reject this last one by 
> making the sampling time of the base PI algo dependent on the max link rate. 
> Then when the queue goes idle, the base PI algo will decay drop down to zero 
> no slower than the queue drains, without needing this extra heuristic.

That’s fair enough.

It sounds like the fairly coarsely discrete time intervals in PIE are the main 
justification for this particular heuristic, so it might be sufficient to 
document that WRT PIE itself.  Using finer time intervals is clearly a better 
choice for the future.

 - Jonathan Morton

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