[tsvwg] Fwd: Re: sce vs l4s comparison plots?

Tom Henderson <tomhend@uw.edu> Mon, 11 November 2019 03:14 UTC

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From: Tom Henderson <tomhend@uw.edu>
Date: Sun, 10 Nov 2019 19:13:35 -0800
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Subject: [tsvwg] Fwd: Re: sce vs l4s comparison plots?
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Reposting an earlier message

> -------- Forwarded Message --------
> Subject: Re: [tsvwg] sce vs l4s comparison plots?
> Date: Sun, 10 Nov 2019 14:27:58 -0800
> From: Tom Henderson <tomh@tomh.org>
> To: Dave Taht <dave@taht.net>et>, tsvwg IETF list <tsvwg@ietf.org>rg>, tcpm@ietf.org
>
>

Dave, I missed replying earlier to a few of your points below (inline).
>
> On 11/9/19 3:05 PM, Dave Taht wrote:
>
>
> By default (when run without -x) flent captures very little metadata
> about the system it is run on (IP addresses, a couple sysctls, and
> qdiscs) but it's helpful to have. One example that would be in that
> metadata, is that I'm unsure if the ns3 data is using an IW4 or IW10?
>
> It sounds like you are rate limiting with htb? (to what quantum?)
>
> Another example, in more "native" environments running at a simulated
> line rate, BQL is quite important to have in the simulation
> also. there's been a couple papers published on BQL's benefits vs a raw
> txring, thus far, there's a good plot of what it does in fig 6 of:
>
> http://sci-hub.tw/10.1109/LANMAN.2019.8847054
>
>

in the ns-3 simulations posted, BQL is enabled on all links.

>
>
> Lastly...
>
> So far as I know ns(X) does not correctly simulate GSO/TSO even when
> run in DCE mode, but I could be out of date on that. TBF (and cake)
> do break apart superpackets, htb (+ anything, like fq_codel or dualq)
> do not.
>
>

Correct, we do not have an ns-3 model for GSO/TSO. Is it needed (in
the simulation) if BQL is enabled with small device queues?

- Tom