Re: [Geopriv] draft-tschofenig-geopriv-l7-lcp-ps-02.txt

From: Henning Schulzrinne ^lt;hgs@cs.columbia.edu>
Date: Thu Aug 31 2006 - 20:22:33 EDT

I'm sorry, but that is wrong. Each link only incurs the incremental
cost of carrying 60 bytes if by value. You'd have to have a dozen
server hops to compensate for one reference retrieval.

On Aug 31, 2006, at 7:10 PM, Winterbottom, James wrote:

> I might point out that the if the route determining proxy isn't the
> first proxy, and TLS is used , then the solution argument below is
> void
> as the message size is propagated over each link when transported by
> value, but only over one link where done by reference.
>
>> -----Original Message-----
>> From: Henning Schulzrinne [mailto:hgs@cs.columbia.edu]
>> Sent: Friday, 1 September 2006 2:36 AM
>> To: Andrew Newton
>> Cc: GEOPRIV; John Schnizlein
>> Subject: Re: [Geopriv] draft-tschofenig-geopriv-l7-lcp-ps-02.txt
>>
>>> 1) If the end host is required to send location by value but the
>>> location is determined by the network, then that location must be
> sent
>>> from the network to the end host, and then from the end host to the
> next
>>> hop. You are right that the first leg could be done by push instead
>>> pull, but it is still less efficient than delegating the task to the
>>> network.
>>
>> I don't think we're disagreeing, but since this gets mentioned a lot,
> it
>> is probably worth qualifying this before the unqualified statement
>> becomes accepted wisdom. This is only true if the client access
>> bandwidth is dramatically more scarce or expensive than the bandwidth
>> used by the consumers of location information. A reference, due to
>> the
>> need to set up a TCP connection and wrap the request and response in
>> some kind of protocol, can easily turn a 60-byte (unsigned) location
>> object into a 500-byte network transaction, even without TLS. With
> TLS,
>> we're probably closer to 2000 bytes, although this is no more than a
>> rough guess.
>>
>> Henning
>>
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Received on Thu, 31 Aug 2006 20:22:33 -0400

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