[Cake] [RFC PATCH 4/5] q_netem: support delivering packets in delayed time slots

[Dave Taht]

Pete Heist <peteheist at gmail.com> writes:

>     On Nov 19, 2017, at 9:41 PM, Dave Taht <dave at taht.net> wrote:
>
>     
>     
>     Yep with bql. I hadn’t thought about mq before. What my qos setup scripts
>         are
>         doing though is replacing the root qdisc (which now I see defaults to
>         mq) with a
>         single cake instance. With bql, should rather be leaving mq and putting
>         four
>         cake instances underneath it?
>
>     Only if you want unlimited mode, and birthday problems, and don't have
>     cpu to burn.
>     
>
> Ok, if I compare the two, latency under load for rrul_be looks “better”
> (~1-1.5ms instead of ~3ms) with a single “cake unlimited besteffort lan”
> instance instead of four of them underneath mq.

Yep. Adding more unmanaged queues doesn't help. However it should spread
the load across more cpus.