Re: [aqm] CoDel: After much ado ...

Jana Iyengar <> Sat, 30 September 2017 01:01 UTC

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From: Jana Iyengar <>
Date: Fri, 29 Sep 2017 18:01:44 -0700
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To: "Mirja Kuehlewind (IETF)" <>
Cc:, "" <>, Van Jacobson <>, Andrew McGregor <>, Kathleen Nichols <>
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Subject: Re: [aqm] CoDel: After much ado ...
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Thanks for you review -- apologies for not addressing everything. I had
left a few things out as not necessary to change the draft, but we've now
made the following changes in draft-ietf-aqm-codel-09

1) Did you also check the sec-art and gen-art review. Both, as well as some
> ADs, suggested to (better) define such terms as Sojourn time, estimator, or
> Interval. Would it make sense to add something to the terminology section,
> or did you decide this is not needed?

We've added these definitons now in Section 2.

> 2) Did you see Alia’s comments on mircoflows? I think it is true that in
> some cases you may also want to use additional information like the flow
> label or DSCP and not just the 5-tuple, while the text explicitly talks
> about 5-tuples. Do you want to add something here, or did you on purpose
> decide to only restrict to 5-tuples? I thinks this may be an unnecessary
> restriction and probably was not meant to be one.

We fixed the draft to remove mentions of 5-tuples. (This was already done
in -08.)

> 3) Did you see this comment from Ekr:
> "Following up on the above point, you must be able to
>   drop packets when the queue is entirely full, but S
>   4.4 doesn't seem to contemplate this. What is the impact
>   of this? You just drop and ignore?“
> Can you explain how this was addressed? Maybe I just missed that but it
> seems important.

There's nothing to be done if a packet arrives at a full buffer besides
dropping it... we've added a sentence now that says "Packets arriving at a
full buffer SHOULD be dropped." Hopefully that should clarify things.

Hope this covers everything that's pending -- let me know if I've missed

(I received jim-jam biscuits/cookies from Jim Gettys which helped with this
round -- thanks Jim :-))

- jana

> Mirja
> > Am 12.09.2017 um 02:27 schrieb Jana Iyengar <>om>:
> >
> > ... draft-ietf-aqm-codel-08 is finally posted. This new version
> addresses all IESG comments during IESG review, in addition to review
> comments by Patrick Timmons and Yoav Nir. We thank everyone for their help
> with reviews.
> >
> > Most importantly, I want to personally thank the fq_codel authors for
> sending me Yerba Mate, Dave Taht for sending me delicious freshly-baked
> cookies, and Paul McKenney for sending me a ton of organic green tea to
> help me move on the document. I will say that you all managed to do
> something nobody has managed so far: you successfully shamed me into
> getting this work done.
> >
> > I also received bungee cords from the fq_codel authors to tie myself to
> my chair with, which I put to good use: I would like to share here evidence
> of my atonement. (Cookies are not in the picture, because they were
> delicious. Thanks, Dave!)
> >
> > - jana
> >
> > (P.S.: I now look forward to receiving thank you gifts. Oh, and I'm
> caffeine-free and vegetarian, just in case.)
> >