Re: [Sipping] FW:WGLC Review: draft-ietf-sipping-presence-scaling-requirements-01.txt

[Paul Kyzivat <pkyzivat at cisco.com>]

Schmidt, Christian 1. (NSN - DE/Munich) wrote:
> Hi,
> 
> A short comment / queston, concerning a scalility requirement:
> 
>    o  REQ-007: Presence systems (intra or inter-domain) SHOULD scale in
>       linear proportion to the number of watchers and presentities in
>       the system.
> 
> This requirement takes not into account the relationsship between presentities
> And watchers. Meaning for example in adding few presentities with a huge amount of watchers,
> This linear proportion can not be achieved. Therefore I think, this has to
> Be taken into account in this requirement.

>    o  REQ-007: Presence systems (intra or inter-domain) SHOULD scale in
>       linear proportion to the number of watchers and presentities in
>       the system. Precondition ist that the number of watchers of a presentity and the
>       number of precentities a watcher can monitor is restricted.

How about:

    o  REQ-007: Presence systems (intra or inter-domain) SHOULD scale in
       linear proportion to the number of watchers and presentities in
       the system, so long as the average number of watchers per
       presentity has a fixed bound.

Namely, its not necessary to bound any particular user's behavior so 
long as the average is fixed rather than proportional to the number of 
presentities.

Over the short term that is likely to be true by accident. Over longer 
periods of time, as the system becomes ubiquitous, the average number is 
likely to rise but maybe not in proportion to the number of users in the 
system.

This behavior could probably be constrained if there was a cost to the 
end user associated with having a buddy.

	Thanks,
	Paul
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