Thanks Greg for the comments. 1. ``inband'' here means the host queries the network telemetry information along the path where its traffic traverses through in real time. 2. Although the "out-of-band telemetry" may provide feedback-based control via management plane, the target scenario achieves congestion control for low latency (~10 us round trip time) where inband fits better. 3. I would think so. In fact, IOAM (draft-ietf-ippm-ioam-data-17) is part of our implementation examples.
-Rui ------------------------------------------------------------------ From:Greg Mirsky <[email protected]> Sent At:2022 Mar. 15 (Tue.) 16:23 To:Rui <[email protected]> Cc:Acee Lindem (acee) <[email protected]>; rtgwg <[email protected]> Subject:Re: New Version Notification for draft-miao-rtgwg-hpccplus-00.txt Hi Rui, it seems that the proposed congestion control mechanism is dependent on "inband telemetry". If my understanding is correct, I have several questions: I see that OAM methods listed in Section 6.1 can be classified, based on RFC 7799, as hybrid measurement methods. It is not clear why they are referred to as "inband". Could you please clarify the interpretation of "inband telemetry" in the draft. Furthemore, do you see the case of using "out-of-band telemetry" as the basis for the proposed congestion control mechanism? And lastly, in your opinion, can active OAM methods be used to provide the information necessary for the HPCC++? Regards, Greg On Tue, Mar 15, 2022 at 2:18 PM Miao, Rui <[email protected]> wrote: Hi Acee, Thanks for the comment. HPCC++ proposes an approach to leverage the in-band telemetry for traffic admission and path selection, which we think is more relevant to routing decisions. Besides, HPCC++ is orthogonal to any transports and thus we have several example implementations in the draft. Thanks, Rui ------------------------------------------------------------------ From:Acee Lindem (acee) <[email protected]> Sent At:2022 Mar. 15 (Tue.) 12:43 To:Rui <[email protected]>; rtgwg <[email protected]> Subject:Re: New Version Notification for draft-miao-rtgwg-hpccplus-00.txt Why is this draft in the Routing WG? This work is more applicable to the Transport or Internet Area. Acee From: rtgwg <[email protected]> on behalf of "Miao, Rui" <[email protected]> Reply-To: "Miao, Rui" <[email protected]> Date: Tuesday, March 15, 2022 at 2:42 PM To: Routing WG <[email protected]> Subject: Fw: New Version Notification for draft-miao-rtgwg-hpccplus-00.txt Hello All, We have posted an updated version of HPCC++ at https://datatracker.ietf.org/doc/draft-miao-rtgwg-hpccplus/ . There are two major changes since the last presentation. First, since HPCC++ is orthogonal to different in-band telemetry formats and transport protocols, we introduce a few reference implementations over those protocols for people to quickly pick up. Second, we advocate a better routing scheme for path selection and traffic admission, building on top of HPCC++'s precise link load information. Please provide any comments you may have on the draft or its extensions. Thanks, Rui ------------------------------------------------------------------ From:internet-drafts <[email protected]> Sent At:2022 Mar. 7 (Mon.) 14:35 To:Harry <[email protected]>; Barak Gafni <[email protected]>; Changhoon Kim <[email protected]>; Jeff Tantsura <[email protected]>; Jeongkeun Lee <[email protected]>; Rong Pan <[email protected]>; Rui <[email protected]>; Yuval Shpigelman <[email protected]> Subject:New Version Notification for draft-miao-rtgwg-hpccplus-00.txt A new version of I-D, draft-miao-rtgwg-hpccplus-00.txt has been successfully submitted by Rui Miao and posted to the IETF repository. Name: draft-miao-rtgwg-hpccplus Revision: 00 Title: HPCC++: Enhanced High Precision Congestion Control Document date: 2022-03-07 Group: Individual Submission Pages: 20 URL: https://www.ietf.org/archive/id/draft-miao-rtgwg-hpccplus-00.txt Status: https://datatracker.ietf.org/doc/draft-miao-rtgwg-hpccplus/ Htmlized: https://datatracker.ietf.org/doc/html/draft-miao-rtgwg-hpccplus Abstract: Congestion control (CC) is the key to achieving ultra-low latency, high bandwidth and network stability in high-speed networks. However, the existing high-speed CC schemes have inherent limitations for reaching these goals. In this document, we describe HPCC++ (High Precision Congestion Control), a new high-speed CC mechanism which achieves the three goals simultaneously. HPCC++ leverages inband telemetry to obtain precise link load information and controls traffic precisely. By addressing challenges such as delayed signaling during congestion and overreaction to the congestion signaling using inband and granular telemetry, HPCC++ can quickly converge to utilize all the available bandwidth while avoiding congestion, and can maintain near-zero in- network queues for ultra-low latency. HPCC++ is also fair and easy to deploy in hardware, implementable with commodity NICs and switches. The IETF Secretariat _______________________________________________ rtgwg mailing list [email protected] https://www.ietf.org/mailman/listinfo/rtgwg
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