[asterisk-dev] [RFC] optimising RTP traffic?

[SteveK]

I'd like to offer my 2c on the issue:  Before you look really hard at  
what it takes to try to move RTP forwarding up from the application  
and into the kernel, it would make sense to:

a) Profile the present situation:  You can use oprofile or other  
tools to profile the entire system, and see where most of the time is  
being spent.   If the goal is to optimize this process, this would  
point out the places to look.  I don't know if this has been done or  
not yet, but it seems the original idea was based on intuition, not  
on actual results.

b) Build a system that you can at least use for profiling, which  
works using sendfile() or similar, even if it doesn't actually work  
properly, and benchmark it.  The point here is to just get a ballpark  
of the improvement you expect to see, to determine if it's worth  
actually making it all work.  You don't need to dot the i's and cross  
the t's, just make it something you can set up calls with, and  
benchmark.

-SteveK