[e2e] Answer to Dave Reed Re: Fwd: Re: Question the other way round:

[Detlef Bosau]

David,

two messages ago you wrote:

>
> We don't actually cause congestion to discover the rate, Jon.
>   Typically, we try to build networks that have adequate capacity
> (factors of 10 or 100 are needed for things like the "Mother's Day"
> effect, or 9/11-scale community need to spread and filter news quickly.)

And this is, excuse me, simply nonsense.

Am 22.11.2013 21:32, schrieb dpreed at reed.com:
>
> Detlef - you missed my point entirely!  By focusing on the network
> only as the end rather than a means in a larger context you eliminated
> the whole issue of congestion.  Think end-to-end, which means you must
> think about why information is being sent.
>
>  
>
> You are interpreting the code in Linux/Unix/... as if it were driven
> by an application whose only goal is to transmit data at the fastest
> possible rate, and has no inherent limit, or even an external reason
> to exist.
>

No. I made a remark on BSD to anticipate a comment like "but in BSD...."

Actually, causing congestion is part of the VJCC congestion handling,
and exactly this is the problem!
>
>  
>
> E.g. cat /dev/zero | <some socket>;
>

Shows what?

Yes: Flow control does work. Or what do I miss?
>
>  
>
> Every application I am aware of (and I mean every application other
> than benchmarks run for short periods) has limited needs, driven by
> "pull" style stuff.  Even a file transfer eventually stops.
>

Even the time eventually ends. And some people even believe, JC (the
other one) will eventually return.
>
>  A file transfer has no natural rate, but it has a satisfactory rate
> in all cases. 
>

Depends on which requirements you want to satisfy.
>
> Usually whatever the file size is divided by 100 msec (a human measure).
>
>  
>
> Enough said?
>


Perhaps, I didn't follow, what you wanted to say...


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