[Cerowrt-devel] [Cake] mo bettah open source multi-party videoconferncing in an age of bloated uplinks?

Toke Høiland-Jørgensen toke at redhat.com
Sat Mar 28 15:58:08 EDT 2020

Dave Taht <dave.taht at gmail.com> writes:

>> So: 1. We really should rethink how timing-sensitive algorithms are
>> expressed, and it isn't gonna be good to base them on semaphores and
>> threads that run at random rates. That means a very different OS
>> conceptual framework. Can this share with, say, the Linux we know and
>> love - yes, the hardware can be shared. One should be able to
>> dedicate virtual processors that are not running Linux processes, but
>> instead another computational model (dataflow?).
> Linux switched to an EDF model for networking in 5.0

Not entirely. There's EDT scheduling, and the TCP stack is mostly
switched over, I think. But as always, Linux evolves piecemal :)

>> 2. EBPF is interesting, because it is more secure, and is again
>> focused on running code at kernel level, event-driven. I think it
>> would be a seriously difficult lift to get it to the point where one
>> could program the networked media processing in BPF.
> But there is huge demand for it, so people are writing way more in it
> than i ever ever thought possible... or desirable.

Tell me about it.

We have seen a bit of interest for combining eBPF with realtime, though.
With the upstreaming of the realtime code, support has landed for
running eBPF even on realtime kernels. And we're starting to see a bit
of interest for looking specifically at latency bounds for network
processing (for TSN), including XDP. Nothing concrete yet, though.


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