[Bloat] [Cerowrt-devel] DC behaviors today

Mikael Abrahamsson swmike at swm.pp.se
Fri Dec 8 02:05:39 EST 2017

On Mon, 4 Dec 2017, dpreed at reed.com wrote:

> I suggest we stop talking about throughput, which has been the mistaken 
> idea about networking for 30-40 years.

We need to talk both about latency and speed. Yes, speed is talked about 
too much (relative to RTT), but it's not irrelevant.

Speed of light in fiber means RTT is approx 1ms per 100km, so from 
Stockholm to SFO my RTT is never going to be significantly below 85ms 
(8625km great circle). It's current twice that.

So we just have to accept that some services will never be deliverable 
across the wider Internet, but have to be deployed closer to the customer 
(as per your examples, some need 1ms RTT to work well), and we need lower 
access latency and lower queuing delay. So yes, agreed.

However, I am not going to concede that speed is "mistaken idea about 
networking". No amount of smarter queuing is going to fix the problem if I 
don't have enough throughput available to me that I need for my 

Mikael Abrahamsson    email: swmike at swm.pp.se

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