[Bloat] The NetEm qdisc does not work in conjunction with other qdiscs

[Maximilian Bachl]

>From my experience (experimented with it last year), it still behaves
weirdly. You can use htb for the shaping and you can create delay using
netem by using it on another (virtual) host on a link that does not have
any other qdiscs and where the link is not the bottleneck.

Best regards,
Max

On Fri 25. Oct 2024 at 20:54, Joerg Deutschmann via Bloat <
bloat at lists.bufferbloat.net> wrote:

> Dear all,
>
> bringing up again the question from a previous message to this list...
>
>
> https://www.bufferbloat.net/projects/codel/wiki/Best_practices_for_benchmarking_Codel_and_FQ_Codel/#the-netem-qdisc-does-not-work-in-conjunction-with-other-qdiscs
> says to not use NetEm together with other qdiscs.
>
> Is this still true?
>
> How could one emulate bottlenecks together with fq_codel?
>
> Best regards
> Joerg
>
>
> On 15.01.24 13:24, O. P. via Bloat wrote:
> >
> > Hi there,
> >
> > I'm trying to set up a testbed to evaluate different AQM techniques
> > using docker containers.
> > My first idea to create congestion was to use netem. However I later
> > came across
> >
> https://www.bufferbloat.net/projects/codel/wiki/Best_practices_for_benchmarking_Codel_and_FQ_Codel/
> <
> https://www.bufferbloat.net/projects/codel/wiki/Best_practices_for_benchmarking_Codel_and_FQ_Codel/>
> which discourages using netem. Since the document is from 2014 and also
> states that "netem has been improving", my question was wether the current
> netem has improved sufficiently to be used to get realistic results.
> > If netem has improved sufficienly, what would be the correct way to use
> > netem along fq, fq-codel or codel for example ?
> > If not, is HTB still the best way to perform rate limiting ? Is there a
> > prefered way to combine HTB with AQMs ?
> >
> > Best regards
> >
> > John
> >
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