On Thu, Mar 18, 2010 at 06:54:13PM -0400, Woundy, Richard wrote:
> How about:
>
> (Probability of picking peer X) := (Prov.BW of peer X) / (Sum prov.BW)
better. :) though getting BW info for all peers might be unrealistic
> Or here's a totally different idea. The client states a bandwidth
> floor and the server/service eliminates peers without at least that
> much provisioned bandwidth???
The ALTO reqs draft already says:
5.3. Performance-related rating criteria
o The minimum achievable throughput between the resource consumer
and the candidate resource provider, which is considered useful by
the application (only in ALTO queries), or
o An arbitrary upper bound for the throughput from/to the candidate
resource provider (only in ALTO replies). This may be, but is not
necessarily the provisioned access bandwidth of the candidate
resource provider.
...
The ALTO client MUST be aware, that with high probability, the actual
performance values differ significantly from these upper and lower
bounds. In particular, an ALTO client MUST NOT consider the "upper
bound for throughput" parameter as a permission to send data at the
indicated rate without using congestion control mechanisms.
...
Nevertheless, these rating
criteria may provide a useful shortcut for quickly excluding
candidate resource providers from such probing, if it is known in
advance that connectivity is in any case worse than what is
considered the minimum useful value by the respective application.
-- Sebastian
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