[Bloat] Up-to-date buffer sizes?

[Aaron Wood]

Are you asking what they _should_ be, or what the typical buffering seen in
equipment actually is?


On Wed, Mar 9, 2022 at 9:39 AM Michael Menth <menth at uni-tuebingen.de> wrote:

> Hi all,
>
> I don't question the usefulness of AQMs for buffers - on the contrary.
> But what are up-to-date buffer sizes in networking gears, especially if
> AQMs are not in use? It's hard to find public and information about it.
> Anyone can point to a citable source?
>
> This raises also the question about the deployment of AQMs in networking
> infrastructure. I know it's already adopted by some OSs, but what about
> forwarding nodes? Any papers about it?
>
> Kind regards
>
> Michael
>
> Am 09.03.2022 um 18:24 schrieb Jesper Dangaard Brouer:
> >
> >
> > On 09/03/2022 17.31, Toke Høiland-Jørgensen via Bloat wrote:
> >> Michael Menth <menth at uni-tuebingen.de> writes:
> >>
> >>> Hi all,
> >>>
> >>> are there up-to-date references giving evidence about typical buffer
> >>> sizes for various link speeds and technologies?
> >>
> >> Heh. There was a whole workshop on it a couple of years ago; not sure if
> >> it concluded anything: http://buffer-workshop.stanford.edu/program/
> >>
> >> But really, asking about buffer sizing is missing the point; if you have
> >> static buffers with no other management (like AQM and FQ) you're most
> >> likely already doing it wrong... :)
> >
> > Exactly, I agree with Toke. The important parameter is the latency.
> > Or the packet sojourn time (rfc8289 + rfc8290) observed waiting in the
> > queue.
> >
> > The question you should be asking is:
> >   - What is the max queue latency I'm "willing" to experience on this
> link?
> >
> > Hint, you can then depending on the link rate calculate the max buffer
> > size you should configure.
> >
> > The short solution is:
> >   - just use fq_codel (rfc8290) as the default qdisc.
> >
> > --Jesper
> >
> >
> >
>
> --
> Prof. Dr. habil. Michael Menth
> University of Tuebingen
> Faculty of Science
> Department of Computer Science
> Chair of Communication Networks
> Sand 13, 72076 Tuebingen, Germany
> phone: (+49)-7071/29-70505
> fax: (+49)-7071/29-5220
> mailto:menth at uni-tuebingen.de
> http://kn.inf.uni-tuebingen.de
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