[Codel] [Cake] Proposing COBALT

[Jonathan Morton]

> On 4 Jun, 2016, at 17:01, moeller0 <moeller0 at gmx.de> wrote:
> 
> Maybe cake should allow to switch from the default mark by ECN policy to mark by drop per command line argument? At least that would allow much easier in the field testing… As is there is only the option of disabling ECN at the endpoint(s)…

I consider ignoring ECN in the way I described to be a fault condition inevitably resulting in unresponsive traffic.  As a fault condition, it should be rare.

The main effect in practice is that the RTT for the affected flows grows well beyond normal, but since they are bulk transfers, this has only a minor detrimental effect (much of which is incurred sender-side in the form of retransmission buffers two orders of magnitude larger than necessary).

Rather than further complicate Codel or Cake, I’d like to simply apply a general solution for unresponsive traffic, ie. COBALT.

 - Jonathan Mortob