Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the cake AQM
Greg White <g.white@cablelabs.com> Tue, 14 March 2023 16:25 UTC
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From: Greg White <g.white@cablelabs.com>
To: Dave Taht <dave.taht@gmail.com>, "Ruediger.Geib@telekom.de" <Ruediger.Geib@telekom.de>
CC: tsvwg IETF list <tsvwg@ietf.org>, Cake List <cake@lists.bufferbloat.net>
Thread-Topic: draft-ietf-tsvwg-nqb-15.txt vs the cake AQM
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Date: Tue, 14 Mar 2023 16:25:12 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/nfiZC5LKHnZkJbmfa0LH-nYp9-c>
Subject: Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the cake AQM
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Hi Dave, The NQB requirement is that it shares capacity with and is at the same priority as Default (CS0). So, for all priority queue options in CAKE (aside from precedence, perhaps), I would recommend that you align with that requirement. So, I think I agree with what you wrote below for besteffort, diffserv3 and precedence, but for diffserv4 CAKE would be non-compliant if it put NQB into the video class. I don't understand diffserv8, since the man page doesn't appear to describe it. But, the same logic should hold there too. In most cases, I think the flow isolation in CAKE already provides the benefit that the NQB PHB is aiming to achieve. But, in the flowblind, srchost, dsthost, & hosts modes, it doesn't. Here is where you could consider doing a full implementation of the NQB PHB (a separate queue in the Best Effort tin). If you choose to take that on, the recommendation is to implement a traffic protection mechanism. This would be a really interesting test case to see whether you think the draft is sufficiently detailed for you to come up with a design for linux. You mentioned a Part II to discuss the various wash modes. I only see two modes (wash/nowash) am I missing something? -Greg On 3/14/23, 8:02 AM, "Dave Taht" <dave.taht@gmail.com <mailto:dave.taht@gmail.com>> wrote: I have been sitting on the cake related patches for this for years now, and it is my hope to get support for NQB into the next linux release, regardless of whether it gets through last call at this time, unless the selected codepoint number changes. (?) Cake (please see the man page here: https://man7.org/linux/man-pages/man8/tc-cake.8.html <https://man7.org/linux/man-pages/man8/tc-cake.8.html> ) supports multiple diffserv models. besteffort is exactly that, besteffort, and will not gain NQB support. The diffserv3 interpretation is the default, and given that flow queuing handles most of the NQB-like problems naturally, and Voice (CS7, CS6, EF, VA, TOS4) is all that is handled there today, I am thinking of *not* elevating NQB into that class is the right thing. NQB fits nicely into the diffserv4 model in the video class, so I will put it there. since covid we tend to use the diffserv4 model a lot to manage videoconferencing better. As for the CS0-CS7 precedence model inc cake, we have declared that obsolete in the code, and wherever NQB falls into it, great. And the diffserv8, I don´t know. Anyway, does that work for everyone? Part II of this would be a discussion of the various wash modes, but merely getting the right byte into the right lookup tables after all this discussion, would be nice.
- [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-15.txt internet-drafts
- Re: [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-15.t… Greg White
- Re: [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-15.t… Greg White
- [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 3.3. Relati… Ruediger.Geib
- [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Primary… Ruediger.Geib
- [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Primary… Ruediger.Geib
- [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Definition … Ruediger.Geib
- [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 4.2. Aggreg… Ruediger.Geib
- [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section 5.2… Ruediger.Geib
- [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section 5.2… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Definit… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Definit… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Definit… Bless, Roland (TM)
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Definit… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Definit… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 3.3. Re… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 3.3. Re… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 3.3. Re… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 3.3. Re… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Definit… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 4.2. Ag… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 4.2. Ag… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 4.2. Ag… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 4.2. Ag… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 4.2. Ag… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Fred Baker
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 4.2. Ag… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the cake A… Dave Taht
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the ca… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the ca… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the ca… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the ca… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the ca… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the ca… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt vs the ca… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 4.2. Ag… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - Section… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-15.t… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-15.t… Alex Burr
- Re: [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-15.t… Ruediger.Geib
- Re: [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-15.t… Sebastian Moeller
- Re: [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-15.t… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-17.txt - 3.3. Re… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-17.txt - 3.3. Re… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-17.txt - 3.3. Re… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Sebastian Moeller
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Greg White
- Re: [tsvwg] draft-ietf-tsvwg-nqb-15.txt - 5.1 Pri… Ruediger.Geib