RE: 400G forwarding - how does it work?

[Matthew Huff <mhuff () ox com>]

Also, for data center traffic, especially real-time market data and other UDP multicast traffic, micro-bursting is one 
of the biggest issues especially as you scale out your backbone. We have two 100GB switches, and have to distribute the 
traffic over a LACL link with 4 different 100GB ports on different ASIC even though the traffic < 1% just to account 
for micro-bursts.



-----Original Message-----
From: NANOG <nanog-bounces+mhuff=ox.com () nanog org> On Behalf Of sronan () ronan-online com
Sent: Monday, August 8, 2022 8:39 AM
To: Masataka Ohta <mohta () necom830 hpcl titech ac jp>
Cc: nanog () nanog org
Subject: Re: 400G forwarding - how does it work?

You keep using the term “imaginary” when presented with evidence that does not match your view of things. 

There are many REAL scenarios where single flow high throughout TCP is a real requirements as well as high throughput 
extremely small packet size. In the case of the later, the market is extremely large, but it’s not Internet traffic.

Shane

> On Aug 8, 2022, at 7:34 AM, Masataka Ohta <mohta () necom830 hpcl titech ac jp> wrote:
>
> Saku Ytti wrote:
>
> > > which is, unlike Yttinet, the reality.
> > Yttinet has pesky customers who care about single TCP performance 
> > over long fat links, and observe poor performance with shallow 
> > buffers at the provider end.
>
> With such an imaginary assumption, according to the end to end 
> principle, the customers (the ends) should use paced TCP instead of 
> paying unnecessarily bloated amount of money to intelligent 
> intermediate entities of ISPs using expensive routers with bloated 
> buffers.
>
> > Yttinet is cost sensitive and does not want to do work, unless 
> > sufficiently motivated by paying customers.
>
> I understand that if customers follow the end to end principle, 
> revenue of "intelligent" ISPs will be reduced.
>
>                        Masataka Ohta