Re: [Detnet] About the E2E latency of C-SCORE

[Jinoo Joung <[e-mail]>]

Hello Shaofu,

Yes, you are correct.
The SLi is the decisive factor in node i.

However,
SLi = Lmax_i/Ri + L/r.

And L/r is much larger than Lmax_i/Ri.
Thus, according to the definition of "per-hope dominant factor", which is
the largest sum term,
the per-hop dominant factor is L/r.

Best,
Jinoo

On Fri, Mar 22, 2024 at 4:35 PM <[e-mail]> wrote:

>
> Hi Jinoo,
>
>
> Thank you for patiently explaining the latency of C-SCORE during the
> meeting.
>
> I just check the E2E latency equation provided
> in draft-joung-detnet-stateless-fair-queuing-02, it is:
>
>     Dh(p) <= (B-L)/r + SL0 + SL1 + ... + SLh,     (5)
>
>
> Now I realize that we are talking about different things.
>
> The PBOO (pay bursts only once) you mentioned is actually (B-L)/r, right ?
>
> But I (and maybe there are other people who also pay more attention to the
> worst-case latency per-hop), am more concerned about SL0 + SL1 + ... + SLh,
> that is actually an evaluation formula based on *the worst-case latency
> per-hop multiplied by the number of hops*.
>
>
> IMO, (B-L)/r is negligible, especially when the flow is policing on the
> network entrance node and B = L.
>
> That is, the worst-case per-hop latency SLi on each node i is the
> dominator factor.
>
>
> Please correct me if I have any misunderstanding.
>
>
> Regards,
>
> PSF
>
>
>
>
>
>
>
>