Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc8312bis-06.txt

[Yoshifumi Nishida <[e-mail]>]

Hi Vidhi,

On Thu, Jan 27, 2022 at 4:35 PM Vidhi Goel <[e-mail]> wrote:

> Also, I am wondering if https://github.com/NTAP/rfc8312bis/issues/135 has
> been solved completely.
> Have we decided to leave this part as it is? We don't need any texts here
> or are there any future plans?
>
> We have discussed internally and decided to leave it as is. The
> justification is - there is already large scale deployment of CUBIC in
> the field with Beta_cubic = 0.7. We had added the below line to the draft
> as a caution. To change B_cubic for so many deployments, it would require a
> lot of experimental data and perhaps even some deployment experience. Such
> a change would be categorized as a research initiative before it makes it
> to an IETF draft.
>
> *A side effect of setting βcubic to a value bigger than 0.5 is slower
> convergence. We believe that while a more adaptive setting of βcubic could
> result in faster convergence, it will make the analysis of CUBIC much
> harder.*
>

OK. I've thought about this and I am fine with this as long as we recommend
using hystart++ or other burst mitigations during slow start (which is
already done)
--
Yoshi