[Galene] Re: we broke galene head pretty badly today

[Dave Taht <dave.taht@gmail.com>]

On Tue, Jul 6, 2021 at 3:52 AM Juliusz Chroboczek <jch@irif.fr> wrote:
>
> > yes a codel-ly approach would be helpful, but what stage of the
> > pipeline is costing the most cpu?
>
> Galčne is fairly well optimised, on a machine with hardware crypto, most
> of the time is spent in the write system call.  I'll post a profile when
> I'm next at the lab.

What hardware is the weakest and when does it start to fail?

I can also start setting up simple videoconferences. It would be
really good to have a tool
that could create virtual sessions to load things up. I got tired of
bigbuckbunny a long time ago
but I've often thought it would be amusing to try and sync up a 4+ piece band.

>
> > Still, when you run out of cpu, dropping whole frames would be good.
> > you could interleave dropping a frame per sender perhaps?
>
> I can drop every second frame without causing video corruption, and I can
> put backpressure on the sender, the code is already there.  The only
> difficulty is how to determine that I'm under load.

timestamp a packet or frame on entry (as early as possible), check
time again on exit (after the write). If the delta is greater than the
framerate, start dropping frames.

st

>
> -- Juliusz



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Dave Täht CTO, TekLibre, LLC