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Date:   Mon, 19 Sep 2022 10:00:15 -0700
From:   Cong Wang <>
To:     Jakub Kicinski <>
Cc:     Peilin Ye <>,
        "David S. Miller" <>,
        Eric Dumazet <>,
        Paolo Abeni <>,
        Jonathan Corbet <>,
        Hideaki YOSHIFUJI <>,
        David Ahern <>,
        Jamal Hadi Salim <>,
        Jiri Pirko <>,
        Peilin Ye <>,,,,
        Cong Wang <>,
        Stephen Hemminger <>,
        Dave Taht <>
Subject: Re: [PATCH RFC v2 net-next 0/5] net: Qdisc backpressure

On Mon, Aug 29, 2022 at 05:21:11PM -0700, Jakub Kicinski wrote:
> On Mon, 29 Aug 2022 09:53:17 -0700 Cong Wang wrote:
> > > Similarly to Eric's comments on v1 I'm not seeing the clear motivation
> > > here. Modern high speed UDP users will have a CC in user space, back
> > > off and set transmission time on the packets. Could you describe your
> > > _actual_ use case / application in more detail?  
> > 
> > Not everyone implements QUIC or CC, it is really hard to implement CC
> > from scratch. This backpressure mechnism is much simpler than CC (TCP or
> > QUIC), as clearly it does not deal with any remote congestions.
> > 
> > And, although this patchset only implements UDP backpressure, it can be
> > applied to any other protocol easily, it is protocol-independent.
> No disagreement on any of your points. But I don't feel like 
> you answered my question about the details of the use case.

Do you need a use case for UDP w/o QUIC? Seriously??? There must be
tons of it...

Take a look at UDP tunnels, for instance, wireguard which is our use
case. ByteDance has wireguard-based VPN solution for bussiness. (I hate
to brand ourselves, but you are asking for it...)

Please do research on your side, as a netdev maintainer, you are
supposed to know this much better than me.


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