[Bloat] RE : DSLReports Speed Test has latency measurement built-in

[luca.muscariello at orange.com]

Do I need to read this as all Google servers == all servers :)

BTW if a paced flow from Google shares a bloated buffer with a non paced flow from a non Google server,  doesn't this turn out to be a performance penalty for the paced flow?

fq_codel gives incentives to do pacing but if it's not deployed what's the performance gain of using pacing?


-------- Message d'origine --------
De : Eric Dumazet
Date :2015/04/22 21:51 (GMT+08:00)
À : MUSCARIELLO Luca IMT/OLN
Cc : "Steinar H. Gunderson" , bloat
Objet : Re: [Bloat] DSLReports Speed Test has latency measurement built-in

On Wed, 2015-04-22 at 08:51 +0000, luca.muscariello at orange.com wrote:
> cons: large BDP in general would be negatively affected.
> A Gbps access vs a DSL access to the same server would require very
> different tuning.
>
Yep. This is what I mentioned with 'long rtt'. This was relative to BDP.
>
> sch_fq would probably make the whole thing less of a problem.
> But running it in a VM does not sound a good idea and would not
> reflect usual servers setting BTW
>
No idea why it should mater. Have you got some experimental data ?

You know, 'usual servers' used to run pfifo_fast, they now run sch_fq.

(All Google fleet at least)

So this kind of argument sounds not based on experiments.



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