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charset="utf-8" Content-Transfer-Encoding: quoted-printable Why there no exists a readable description of bbr in a single updated doc? Sent from Gmail Mobile Il giorno ven 19 apr 2024 alle 16:33 Christian Huitema > ha scritto: On 4/19/2024 7:24 AM, Neal Cardwell wrote: > On Fri, Apr 19, 2024 at 4:39=E2=80=AFAM Vasilenko Eduard 40huawei.com@dmarc.ietf.org> wrote: > >> Hi Experts, >> I see L4S as the "Congestion Control Next Generation from IETF" (that is >> actually in competition with "Congestion Control Next Generation from >> Google"). >> > IMHO BBR is not in competition with L4S. > > BBR is, at its core, about maintaining an explicit model of the network > path using whatever signals are available, and using that model to try to > achieve low/bounded delay, low loss, and high throughput. > > L4S, IMHO, is largely about creating a low-latency, low-loss, scalable > throughput service model (metaphorically a "lane") in Internet bottleneck= s, > and using ECN to provide a signal to achieve that. > > There is nothing fundamentally at odds about those two models. And once t= he > details of the Prague congestion control algorithm are finalized, one goa= l > (as our team has mentioned for a number of years) is to have a version of > BBR that can use L4S signals and coexist with Prague congestion control i= n > the L4S lane of Internet bottlenecks. I have done simulations of what happens if QUIC and BBR are used end-to-end, and the bottleneck implements an L4S like ECN marking strategy. My implementation of BBRv3 was modified to monitor the ECN marking rate, and treat excess numbers as a congestion signal, in parallel with other signals such as RTT or delivery rate. Bottom line, it works exactly as expected. Which is good news, because it means we can deploy L4S gradually, use it as a congestion signal if it is deployed on the path, use the other congestion signals if ECN is not deployed yet. -- Christian Huitema Informativa Privacy - Ai sensi del Regolamento (UE) 2016/679 si precisa che= le informazioni contenute in questo messaggio sono riservate e ad uso escl= usivo del destinatario. Qualora il messaggio in parola Le fosse pervenuto p= er errore, La preghiamo di eliminarlo senza copiarlo e di non inoltrarlo a = terzi, dandocene gentilmente comunicazione. Grazie. Privacy Information - T= his message, for the Regulation (UE) 2016/679, may contain confidential and= /or privileged information. If you are not the addressee or authorized to r= eceive this for the addressee, you must not use, copy, disclose or take any= action based on this message or any information herein. If you have receiv= ed this message in error, please advise the sender immediately by reply e-m= ail and delete this message. Thank you for your cooperation. --000000000000b267960616e6395c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Why there no exists a readable description of bbr in a si= ngle updated doc? 

Sent from Gmail Mobile


Il giorno ven 19 apr 2024 alle 16:33 = Christian Huitema <huitema@huitem= a.net> ha scritto:


On 4/19/2024 7:24 AM, Neal Cardwell wrote:
> On Fri, Apr 19, 2024 at 4:39=E2=80=AFAM Vasilenko Eduard <vasilenko= .eduard=3D
> 40hua= wei.com@dmarc.ietf.org> wrote:
>
>> Hi Experts,
>> I see L4S as the "Congestion Control Next Generation from IET= F" (that is
>> actually in competition with "Congestion Control Next Generat= ion from
>> Google").
>>
> IMHO BBR is not in competition with L4S.
>
> BBR is, at its core, about maintaining an explicit model of the networ= k
> path using whatever signals are available, and using that model to try= to
> achieve low/bounded delay, low loss, and high throughput.
>
> L4S, IMHO, is largely about creating a low-latency, low-loss, scalable=
> throughput service model (metaphorically a "lane") in Intern= et bottlenecks,
> and using ECN to provide a signal to achieve that.
>
> There is nothing fundamentally at odds about those two models. And onc= e the
> details of the Prague congestion control algorithm are finalized, one = goal
> (as our team has mentioned for a number of years) is to have a version= of
> BBR that can use L4S signals and coexist with Prague congestion contro= l in
> the L4S lane of Internet bottlenecks.

I have done simulations of what happens if QUIC and BBR are used
end-to-end, and the bottleneck implements an L4S like ECN marking
strategy. My implementation of BBRv3 was modified to monitor the ECN
marking rate, and treat excess numbers as a congestion signal, in
parallel with other signals such as RTT or delivery rate. Bottom line,
it works exactly as expected.

Which is good news, because it means we can deploy L4S gradually, use it as a congestion signal if it is deployed on the path, use the other
congestion signals if ECN is not deployed yet.

-- Christian Huitema

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