From:  Patrick McManus <mcmanus@ducksong.com>
Date:  08 Aug 2017 21:15:14 Hong Kong Time
Newsgroup:  news.mozilla.org/mozilla.dev.tech.network
Subject:  

Re: [necko] How many speculative connections is enough (or too many?)

NNTP-Posting-Host:  63.245.214.181

in general connection costs are low in bandwidth and low in cpu but high in
latency.. so neither end really minds if we make too many. perhaps the
constant 6 is wrong, but I think any adjustment should be based on data
unless there is a firm problem beig reacted to.

determining h2 does not require http, but it does require tls to be
complete.. this info is cached.

On Mon, Aug 7, 2017 at 10:35 PM, Jason Duell  wrote:

> So right now we'll launch a new speculative TCP connection (up to 6) for
> each call to the speculative connect API:
>
>    https://bugzilla.mozilla.org/show_bug.cgi?id=1383299#c14
>
> (For HTTP/2,  presumably they get merged into one socket once we figure
> out we're doing H/2, but we won't know that till we actually issue an HTTP
> request IIUC).
>
> 1) Are we happy with this as the default behavior?   I'm not sure we want
> to open this many speculative sockets to the same host.
>
> 2) In this bug we're talking about possibly calling the speculative API
> multiple times for the same logical channel (once when the user gets close
> to a link with the mouse, once when they click down on it, etc, and
> possibly also in some central location(s) in the parent before we send off
> a URIload notice to the child):
>
>      https://bugzilla.mozilla.org/show_bug.cgi?id=1383299#c14
>
> I'm thinking we should add a "no-dupe" version of speculative connect for
> this behavior (i.e. it wouldn't start a new speculative connection if
> there's one to that origin already).   Any other ideas?
>
> 3) For the case where they want to call the speculative API in the parent
> when we actually know 100% that we'll be navigating there (i.e the only
> reason for the call is to launch the socket immediately without having to
> wait for the parent to notify the child about the load), would we want to
> do the same thing we do for regular channels (open 2 sockets in staggered
> succession)?
>
> Jason
>
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> .
>