Re: [aqm] Alia Atlas' Yes on draft-ietf-aqm-codel-07: (with COMMENT)

"Mirja Kuehlewind (IETF)" <ietf@kuehlewind.net> Thu, 13 April 2017 10:34 UTC

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From: "Mirja Kuehlewind (IETF)" <ietf@kuehlewind.net>
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Date: Thu, 13 Apr 2017 12:34:46 +0200
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To: Alia Atlas <akatlas@gmail.com>
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Subject: Re: [aqm] Alia Atlas' Yes on draft-ietf-aqm-codel-07: (with COMMENT)
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Hi Alia,

thanks for your feedback! Just on your first point regarding the status. The working group felt that there was not enough deployment to go directly to standards track and given AQM algorithm don’t need interoperability it was not really important for them to go to standards track right away. However, I leave it to the authors if they are able to add more text on how experimentation should be further performed.

Mirja



> Am 13.04.2017 um 07:28 schrieb Alia Atlas <akatlas@gmail.com>;:
> 
> Alia Atlas has entered the following ballot position for
> draft-ietf-aqm-codel-07: Yes
> 
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> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-aqm-codel/
> 
> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> Thank you for a clear and very well written document.  This was well
> worth staying up
> past 1am to read fully.  I do have one primary comment and a couple minor
> points.
> 
> First, the document status is Experimental.   While encouraging
> experimentation, the
> document doesn't really articulate what the concerns are or how
> experimentation might
> determine that this should be changed to standards track.  While
> regrettably I haven't
> personally followed the AQM work, I might assume that some of the issues
> to general
> applicability might be tied to aspects around the challenges of applying
> CoDel to a 
> system architecture built around WRED AQM and enqueue complexity rather
> than dequeue
> complexity.  Having a paragraph that gave context in the introduction for
> the questions
> still to be explored would be helpful.
> 
> a) In Sec 3.4 :  "This property of CoDel has been exploited in
>   fq_codel [FQ-CODEL-ID], which hashes on the packet header fields to
>   determine a specific bin, or sub-queue, for each five-tuple flow,"
>  For the general case of traffic, it would be better to focus on using a
> microflow's
>  entropy information  - whether that is derived from a 5-tuple, the IPv6
> flow label, 
>  an MPLS Entropy label, etc.  Tying this specifically to the 5-tuple is
> not ideal.
>  Obviously I missed this for draft-ietf-aqm-fq-codel-06 - but even a
> slight rephrasing
> to "for each microflow, identifiable via five-tuple hash, src/dest + IPv6
> flow label, or
> other entropy information" would encourage better understanding of
> micro-flow identification.
> Of course, this is just a comment - so do with it what you will.
> 
> b) (Nit) In Sec 5.1: " We use this insight in the pseudo-code for CoDel
> later in the draft."
>  The pseudo-code is actually earlier in the draft.  Also
> s/draft/document for publication.
> 
> 
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