On Mon, Jun 4, 2018 at 1:28 PM, Bless, Roland (TM) <roland.bless@kit.edu> wrote:

Hi,

Am 24.05.2018 um 17:38 schrieb Jan Ceuleers:
> Took 3 years after Dave approached them, but Ubuntu is finally adopting
> fq_codel as the default qdisc.

Yes, if the Linux kernel is forwarding packets it makes a lot of sense,
but I don't understand why it make sense for ordinary end-systems.
Didn't Byte Queue Limits (BQL) suffice? Just curious...

Actually, for a long time now the codel wiki has recommended using sch_fq instead of fq_codel for servers.

It seems Ubuntu defaulting to fq_codel is a result of using systemd which adopted it as default almost 4 years ago. There was a request to change the default in systemd from fq_codel to sch_fq in order to support pacing but the issue was closed when tcp internal pacing was introduced in linux 4.13:

https://github.com/systemd/systemd/issues/5090

/Jonas