> On Aug 24, 2022, at 04:28, Lars Eggert <l...@eggert.org> wrote:
>
>> We deal with that by indicating the RTT is *at least* 4 seconds. Remember
>> that we are implementing a fixed-rate tunnel here. If the RTT is at least 4
>> seconds it's going to basically slow the tunnel to a standstill and so is
>> way more than enough fidelity.
>
> The RTT goes into the rate calculation, and a capped RTT leads to a rate that
> may be low but still higher than what TFRC would calculate with a non-capped
> RTT.
>
> Given that TFRC is a pretty coarse algorithm, using usec resolution is
> probably overkill anyway. Would going to msec resolution work?
The intent of the higher fidelity was to have useful values reported when using
high speed links such as 100GE or 400GE etc. In the future these values may be
of use to newer CC mechanisms.
These time values were reviewed by transport area and found sufficient, we'd
like to leave this as expertly reviewed rather than start making changes at
this late date.
Thanks,
Chris.
>
> Thanks,
> Lars
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