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Re: Questions and comments on CH

From: Ilya Grigorik <igrigorik@gmail.com>
Date: Thu, 31 Mar 2016 12:58:20 -0700
Message-ID: <CAKRe7JHX6DOsYGeWG9YVE6i-2iguJ_QLQv0HhthWkaf9ZyjaHg@mail.gmail.com>
To: Göran Eriksson AP <goran.ap.eriksson@ericsson.com>
Cc: HTTPWG <ietf-http-wg@w3.org>
On Wed, Mar 30, 2016 at 2:37 PM, Göran Eriksson AP <
goran.ap.eriksson@ericsson.com> wrote:

> >
> >
> >Well, the way we defined it [1] is:
> >- in absence of any other signals, we would use the theoretical max DL
> >rate
> >- if we can refine the upper bound (e.g. WiFi drivers do communicate max
> >rate based on RSSI), then we would communicate that value
> >
> >
> >As such, the intent is to communicate the upper bound (with respect to
> >first network hop) to the best of our abilities.
>
> Right. The probability of the theoretical downlink rate to be anywhere
> near the actual one is often pretty low. Now even if making educated
> guesses is tricky in wireless (unless one uses QoS stuff), then it’s at
> least more closer to the actual rate than the theoretical (marketing)
> download rate.
>
> This means the server may want to act differently depending on whether
> it’s the theoretical downlink rate or an educated
> guess/estimate/prediction of the client since these vary in terms of
> likelihood of being an actual representation of what the DL bitrate will
> be. Now server could deduce that by also keeping a list of the theoretical
> rates given in [1] and assuming when DL rate == any_of_theoretical then
> client has not other info.
>
> Making the difference clear in the DL Hint could be useful.
>

Yep, we discussed exactly this in: https://github.com/w3c/netinfo/issues/27.
The conclusion there was that if the browser implements own ~quality
estimator metric, then it should probably be surfaced as a different
attribute.

ig
Received on Thursday, 31 March 2016 19:59:28 UTC

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