If the link is not a bottleneck, then you will not be using buffers (whatever
they are configured to be)
networking gear tends toward the proprietary (although there's a growing amount
that's linux based now) and they tend to be very closed mouth about
configuration like this.
David Lang
On Wed, 9 Mar 2022, Michael Menth wrote:
Date: Wed, 9 Mar 2022 18:39:08 +0100
From: Michael Menth <[email protected]>
To: Jesper Dangaard Brouer <[email protected]>,
Toke Høiland-Jørgensen <[email protected]>, bloat <[email protected]>
Subject: Re: [Bloat] Up-to-date buffer sizes?
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 <[email protected]> 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
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