[Cake] Master branch updated

[Luis E. Garcia]

If we can replicate the results of your test then I would say we're onto
something.

On Monday, 10 October 2016, Jonathan Morton <chromatix99 at gmail.com> wrote:

>
> > On 4 Oct, 2016, at 19:28, Jonathan Morton <chromatix99 at gmail.com
> <javascript:;>> wrote:
> >
> >> Ha ha!  I don't know if you're back from shopping yet...and I'm not
> sure that I've broken it (cobalt branch)...but it has broken my router!
> >
> > Hmm.  It’s been running all day with plenty of traffic over here - but
> it did crash the very first time I loaded it, just not the second.  I will
> need to exercise it some more, preferably on a non-critical machine.
>
> Okay, that bug is fixed and I’ve made further improvements to the
> triple-isolate algorithm.  It no longer needs quite as much spaghetti logic
> in the fast path, and might even be easier to understand from reading the
> code, since it’s now more obviously a modification of DRR++ rather than a
> brute-force wrapper around it.  It should certainly give smoother behaviour
> and be less CPU intensive in common cases.
>
> In brief, what I now do is to scale the *flow* quantum down by the higher
> of the two hosts’ flow counts.  I’ve even dealt with underflow of the
> quotient using a dithering mechanism, which should also ensure that flows
> random-walk out of lockstep with each other.
>
> It works sufficiently well that I was able to set Cake to 2.5Mbit
> besteffort triple-isolate, then watch a 720p YouTube video on one machine
> while another was downloading a game update using a 30-flow swarm.  I’d
> call that a success.
>
> Hammer away at it, and then we’ll see if we can merge it up to master.
>
>  - Jonathan Morton
>
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