Re: [p2pi] Information in an ALTO protocol

There would certainly be value in differentiating between classes of users in terms of their nominal uplink capacity. For example, an ISP with a mix of DSL and FTTH customers would probably prefer that p2p data download from FTTH rather than DSL sources.

I agree that ALTO shouldn't try to know real-time consumption rates vs. capacity. That's (IMO) a question to ask something local to the user, not from a centralized service.

- Laird Popkin, CTO, Pando Networks
  mobile: 646/465-0570

----- Original Message -----
From: "Lars Eggert" <lars.eggert@nokia.com>
To: "ext Vinay Aggarwal" <vinay@net.t-labs.tu-berlin.de>
Cc: p2pi@ietf.org
Sent: Monday, August 11, 2008 11:00:47 AM (GMT-0500) America/New_York
Subject: Re: [p2pi] Information in an ALTO protocol

Hi,

On 2008-8-11, at 17:35, ext Vinay Aggarwal wrote:
> I think an estimate of "last-hop bandwidth" can be an interesting  
> metric
> of information for peer selection.
> It has been shown that selecting peers with high last-hop bandwidth  
> lead
> to improvements in download performance. And this is information  
> that is
> rather hard for peers to find out themselves. As far as I can see, it
> also satisfies all the bars set up by the ALTO service.

Uplink or downlink bandwidth?

Provisioned bandwidth (i.e., the nominal bandwidth a user is paying  
for) or the currently available fraction of it? The latter would be  
something that I doubt an ALTO box can have an accurate view of, since  
it changes on short timescales.

Could you share a reference to papers that show that that information  
is beneficial?

Thanks,
Lars
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