RE: I-D Action: draft-ietf-quic-ack-frequency-08.txt

[Ingemar Johansson S <[e-mail]>]

Hi Mirja + all 

A few comments on the draft 

Minor : "For asymmetric link technologies, such as DOCSIS, LTE,".. I think one can add 5G here as well. 


Major ?: Section 6.4. One concern with this is that CE pattern that flips between CE and ECT(1) (50% marking probability) causes an ACK to be transmitted every 2nd packet. 
I see that it is the same rule in the accurate ECN draft and it appeared to give a 1:12 ACK ratio when we tested it with a 100Mhz BW 5G midband setup (~1.2Gbps throughput). 
And high pMark only accurs at low throughput anyway. So it may not be a concern after all, but here there be dragons. A mmWave connection that is in poor coverage may well be power limited in the uplink, so low DL troughput may be accompanied by even more restricted UL ditto. 

An alternative (more complex?) would perhaps be to trigger an immediate ACK if a CE marked packet is received and there has been no CE marked packets for a max_ack_delay duration, otherwise one follow the normal rules according to ACK_FREQUENCY ?  

/Ingemar


> -----Original Message-----
> From: Mirja Kuehlewind <[e-mail]>
> Sent: Tuesday, 5 March 2024 21:48
> To: [e-mail]
> Subject: Re: I-D Action: draft-ietf-quic-ack-frequency-08.txt
> 
> Hi all,
> 
> as you might have seen we submitted a new revision of the ack-frequency
> draft. This revision addresses all issues raised during WGLC. Most changes
> are editorial or clarification, however, there are few small changes that
> impact normative parts. We will give a quick update on those during the
> session. I believe the chair plan to run a second WGLC after the meeting.
> 
> Thanks to everybody who provided input and continuously engaged!
> 
> Mirja
> 
> 
> 
> On 04.03.24, 22:08, "QUIC on behalf of [e-mail]
> <mailto:[e-mail]>" <[e-mail] <mailto:quic-
> [e-mail]> on behalf of [e-mail] <mailto:internet-
> [e-mail]>> wrote:
> 
> 
> Internet-Draft draft-ietf-quic-ack-frequency-08.txt is now available. It is
> a work item of the QUIC (QUIC) WG of the IETF.
> 
> 
> Title: QUIC Acknowledgment Frequency
> Authors: Jana Iyengar
> Ian Swett
> Mirja Kühlewind
> Name: draft-ietf-quic-ack-frequency-08.txt
> Pages: 17
> Dates: 2024-03-04
> 
> 
> Abstract:
> 
> 
> This document specifies an extension to QUIC that permits an endpoint to
> request that its peer changes its behavior when sending or delaying
> acknowledgments.
> 
> 
> Note to Readers
> 
> 
> Discussion of this draft takes place on the QUIC working group mailing list
> ([e-mail] <mailto:[e-mail]>), which is archived at
> https://mailarchive.ietf.org/arch/search/?email_list=quic. Source
> <https://mailarchive.ietf.org/arch/search/?email_list=quic.&nbsp;&nbsp;Sour
> ce>
> code and issues list for this draft can be found at
> https://protect2.fireeye.com/v1/url?k=31323334-501cfaf3-313273af-
> 454445554331-af6e18098900a7b0&q=1&e=19e85314-bb98-43e3-b842-
> ea0349ce666a&u=https%3A%2F%2Fgithub.com%2Fquicwg%2Fack-frequency
> <https://protect2.fireeye.com/v1/url?k=31323334-501cfaf3-313273af-
> 454445554331-af6e18098900a7b0&amp;q=1&amp;e=19e85314-bb98-43e3-b842-
> ea0349ce666a&amp;u=https%3A%2F%2Fgithub.com%2Fquicwg%2Fack-frequency>.
> 
> 
> Working Group information can be found at
> https://protect2.fireeye.com/v1/url?k=31323334-501cfaf3-313273af-
> 454445554331-9f566af5ea0913be&q=1&e=19e85314-bb98-43e3-b842-
> ea0349ce666a&u=https%3A%2F%2Fgithub.com%2Fquicwg
> <https://protect2.fireeye.com/v1/url?k=31323334-501cfaf3-313273af-
> 454445554331-9f566af5ea0913be&amp;q=1&amp;e=19e85314-bb98-43e3-b842-
> ea0349ce666a&amp;u=https%3A%2F%2Fgithub.com%2Fquicwg>.
> 
> 
> The IETF datatracker status page for this Internet-Draft is:
> https://datatracker.ietf.org/doc/draft-ietf-quic-ack-frequency/
> <https://datatracker.ietf.org/doc/draft-ietf-quic-ack-frequency/>
> 
> 
> There is also an HTML version available at:
> https://www.ietf.org/archive/id/draft-ietf-quic-ack-frequency-08.html
> <https://www.ietf.org/archive/id/draft-ietf-quic-ack-frequency-08.html>
> 
> 
> A diff from the previous version is available at:
> https://author-tools.ietf.org/iddiff?url2=draft-ietf-quic-ack-frequency-08
> <https://author-tools.ietf.org/iddiff?url2=draft-ietf-quic-ack-frequency-
> 08>
> 
> 
> Internet-Drafts are also available by rsync at:
> rsync.ietf.org::internet-drafts
> 
> 
> 
>