[Codel] [RFCv2 PATCH] codel: add ecn_target for when to drop rather than mark ecn packets

[Eric Dumazet]

On Mon, 2012-06-25 at 11:25 -0700, Dave Taht wrote:
> On Mon, Jun 25, 2012 at 10:48 AM, Jonathan Morton <chromatix99 at gmail.com> wrote:
> > My impression is that ECN ignorant flows do exist, because of stupid routers rather than malice, and that Dave considers this a problem worth tackling in codel.
> 
> Malice will exist. It is easy to create a set of flows that will
> overwhelm either codel or fq_codel, with ecn enabled.

Then don't enable ecn. Simple.

Don't try to solve ecn problems at Qdisc layer, its not going to work.

fq_codel is default ecn enabled, because you can overwhelm fq_codel with
or without ecn anyway.