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Date: Wed, 22 Apr 2015 19:28:00 +0200
From: MUSCARIELLO Luca IMT/OLN <luca.muscariello@orange.com>
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To: Eric Dumazet <eric.dumazet@gmail.com>
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Cc: bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] DSLReports Speed Test has latency measurement built-in
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On 04/22/2015 07:16 PM, Eric Dumazet wrote:
> On Wed, 2015-04-22 at 18:35 +0200, MUSCARIELLO Luca IMT/OLN wrote:
>
>> FQ gives you flow isolation.
> So does fq_codel.

yes, the FQ part of fq_codel. that's what I meant. Not the FQ part of 
sch_fq.


>
> sch_fq adds *pacing*, which in itself has benefits, regardless of fair
> queues : Smaller bursts, less self inflicted drops.

This I understand. But it can't protect from non self inflicted drops.

>
> If flows are competing, this is the role of Congestion Control module,
> not packet schedulers / AQM.

Exactly. Two same CC modules competing on the same link, one w pacing 
the other one w/o pacing.
The latter will have negative impact on the former in FIFO. Not in FQ 
(fq_codel to clarify).
And that's my incentive argument which comes from the flow isolation 
feature of FQ (_codel).