[j-nsp] Juniper Buffer Bloat

[Benny Lyne Amorsen]

Colton Conor <colton.conor at gmail.com> writes:

> Benny,
>
> Great information! So what would you do to avoid congest on access
> networks? Example DSLAM's fed by 10G links. The 10G link is no where near
> capacity, but customers are individually maxing out their 20Mbps by 1Mbps
> DSL connection. Would you use DPI, fq-codel, or something else?

The approach $dayjob went with is to classify customer traffic into 3
queues plus one	for network control, and then do RED with a size-limited
queue per subif. It works well	when traffic gets classified
correctly. Tuning RED is challenging and it is tempting to increase
buffer size to give RED a bit more of a chance to react smoothly.

Even so, one aggressive flow can be quite detrimental to everything else
in the samme traffic class.

fq-codel would achieve better results with much less work.


/Benny