[Cake] Long-RTT broken again

[Jonathan Morton]

> On 7 Nov, 2015, at 12:51, Jonathan Morton <chromatix99 at gmail.com> wrote:
> 
> While fixing this, I’m also adding configurability of the buffer limit and statistics of how much of the buffer was actually ever used.  Additionally, I’m choosing a saner default for “unlimited” mode.

Okay, that seems to be working somewhat better now.  I’m still not getting 100Mbps throughput in either direction, but now it seems to be because the receive windows won’t open far enough - there’s enough buffering to prevent any packet loss.

 - Jonathan Morton