Re: [p2pi] Refining the ALTO problem statement

Hi, John,

>> My understanding of what Lars is concerned about, is the idea of using
>> an oracle to provide guidance about path characteristics on a timescale
>> of less than many, many RTTs. He's concerned that a transmitter can
>> respond to "good news" about a path from an oracle more quickly than
>> the oracle can recognize that a transmitter has rapidly ramped up its
>> transmit rate and start telling senders what it's seeing.
>
>   For a number of reasons, oracles _could_ be in a better position to
> know path characteristics. Congestion along a path tends to be 
> concentrated
> at relatively few points along the path. Peers know what they're seeing
> (instantaneously) over the whole path, but generally lack any 
> understanding
> about subpaths.

I agree that oracles could be in a better position to know path 
characteristics.

What I thought Lars was concerned about was not what the oracle could know, 
but how quickly the oracle could share this knowledge with transmitters. If 
someone told Lars that we expect the oracle to adjust its suggestions every 
30 minutes, he'd probably be happier than if someone told Lars that we 
expect the oracle to adjust its suggestions every 30 milliseconds... and I'm 
not sure that Lars knows which is more representative of what people are 
thinking.

Thanks,

Spencer 

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