Same thing applies for WiFi - oftentimes WiFi with poor signal levels 
will cause drops, without congestion. This is something I'm working to 
fix from the WiFi / L2 side. What are the solutions in L3? Some kind of 
hybrid delay & drop based CC?

Simon

On 4/23/2015 8:52 AM, Jonathan Morton wrote:
>
> > By curiosity, what is now responsible for the drops if not the 
> congestion?
>
> I think the point was not that observed drops are not caused by 
> congestion, but that congestion doesn't reliably cause drops. 
> Correlation is not causation.
>
> There are also cases when drops are in fact caused by something other 
> than congestion, including faulty ADSL phone lines. Some local loop 
> providers have been known to explicitly consider several percent of 
> packet loss due to line conditions as "not a fault", to the 
> consternation of the actual ISP who was trying to provide a decent 
> device over it.
>
> - Jonathan Morton
>
>
>
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