Re: [tsvwg] Benjamin Kaduk's No Objection on draft-ietf-tsvwg-le-phb-09: (with COMMENT)
Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com> Tue, 19 February 2019 13:53 UTC
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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
Date: Tue, 19 Feb 2019 05:53:35 -0800
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To: Benjamin Kaduk <kaduk@mit.edu>
Cc: IESG <iesg@ietf.org>, tsvwg@ietf.org, david.black@dell.com, tsvwg-chairs@ietf.org, draft-ietf-tsvwg-le-phb@ietf.org
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Subject: Re: [tsvwg] Benjamin Kaduk's No Objection on draft-ietf-tsvwg-le-phb-09: (with COMMENT)
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Just following up ... On Sun, Feb 17, 2019, 11:24 Benjamin Kaduk <kaduk@mit.edu wrote: > Benjamin Kaduk has entered the following ballot position for > draft-ietf-tsvwg-le-phb-09: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-tsvwg-le-phb/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > This document is generally in fine shape, and has some good discussion > in it. I basically just have some editorial suggestions. > > As one general note, the text sometimes seems to present a mixed story, > for example in the case of "downgrading" traffic from other PHBs. We're > told to in general not do this instead of dropping traffic, but on the > other hand an example use of the LE PHB is for downgrading traffic from > some other PHB (but only when it does not violate the operational > objectives of that other PHB). Greater clarity on who is authorized to > decide to downgrade, and in what cases it makes sense, could be useful. > In a similar vein, the text sometimes suggests a dichotomy between use > of the LE PHB for "preemptable" traffic vs. as a "scavenger" service > class, and at other times suggests that these usages are identical. But > those are, of course, editorial matters. > > Abstract > > The primary objective of this LE > PHB is to protect best-effort (BE) traffic (packets forwarded with > the default PHB) from LE traffic in congestion situations, i.e., when > resources become scarce, best-effort traffic has precedence over LE > traffic and may preempt it. Alternatively, packets forwarded by the > LE PHB can be associated with a scavenger service class, i.e., they > scavenge otherwise unused resources only. [...] > > It seems like "preemptable" and "scavenger" are being deliberately > conflated, but are not necessarily the same. > > Section 3 > > (e.g., if a transport connection fails due to timing out, the > application may try several times to re-establish the transport > connection in order to resume the application session before finally > > There was some directorate review traffic suggesting that further > qualifications about the retries; I do see such qualifying statemnets in > the next paragraph, so maybe there is no big need to do so here as well.. > > Use of the LE PHB might assist a network operator in moving certain > kinds of traffic or users to off-peak times. Alternatively, or in > addition, packets can be designated for the LE PHB when the goal is > to protect all other packet traffic from competition with the LE > > Is it "alternatively" or "in addition" -- can it really be both at the > same time? (I suppose the intent is that different operators could > apply different policies?) > > Section 9 > > Is there a section reference in RFC 3754 to point us to? > > (Also, the RFC Editor will probably put a comma after "Basically".) > > Several forwarding error correction coding schemes such as fountain > codes (e.g., [RFC5053]) allow reliable data delivery even in > > I'm used to seeing "forward error correction"; is "forwarding error > correction" also an acceptabale usage? > > While the resource contention problem caused by multicast packet > replication is also true for other Diffserv PHBs, LE forwarding is > special, because often it is assumed that LE packets get only > > nit: s/get only/only get/ > > forwarded in case of available resources at the output ports. The > previously mentioned redundancy data traffic could nicely use the > varying available residual bandwidth being utilized the by LE PHB, > but only if the previously specific requirements in the internal > implementation of the network devices are considered. > > I'm not sure how to interpret "previously specific requirements", here. > Was it intended to be "previously specified requirements"? > > Section 12 > > As per the GenART review, updating the draft in missref is a bit weird, > but we can probably leave it to the responsible AD and RFC Editor to > decide whether to retain the "Updates" relationship or directly effect > the needed changes. > I do have an RFC Editor Note that points this out, added after the GenART review. So we should be good to go on that point. Spencer
- [tsvwg] Benjamin Kaduk's No Objection on draft-ie… Benjamin Kaduk
- Re: [tsvwg] Benjamin Kaduk's No Objection on draf… Spencer Dawkins at IETF
- Re: [tsvwg] Benjamin Kaduk's No Objection on draf… Roland Bless
- Re: [tsvwg] Benjamin Kaduk's No Objection on draf… Benjamin Kaduk