[ipv6-wg] Happy Eyeballs bias

In your letter dated Wed, 26 Oct 2016 15:54:52 +0200 you wrote:
> So, how about we go the other way. We want IPv6 to be taken more
> seriously. What about if we change the algorithm the other way over
> time: give IPv6 more and more of a head start. That way IPv6
> stability and performance become more important over time, without
> causing brokenness. Something like:
> 
> HE head start = 300 + (months after 2017-01-01) * 30
> 
> That would provide some incentive to make sure that IPv6 is properly
> deployed and managed.

Looking at this from an operating system perspective...

As an experiment I implemented a fully dynamic version of happy eyeball in my
toy-os. It keeps long term statistics about the performance of v4 and v6
and will give v6 a small head start to add a small positive preference to v6.
But if IPv4 is really much better than IPv6, it will not bother with IPv6 at
all.

I don't any reason why any system code would implement what you suggest.
Basically, in a situation where IPv6 is broken, your suggestion would make
the user experience worse and worse. 

For the user, there would be a simple way out of this mess, just disable
IPv6 and performance is back to normal. 

My suggestion: try to get IPv6 to be 80% or more (at least make sure that
IPv6 from content providers is almost universal) and then for eyeball 
networks to stop investing in IPv4. When IPv6 support is the default, people
will notice that some sites have bad performance and that may be because
their IPv6 support is just not there.