[Bloat] Fwd: [Bug 1436945] Re: devel: consider fq_codel as the default qdisc for networking

Mon Jun 4 09:16:17 EDT 2018

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