[asterisk-dev] [RFC] optimisinf RTP traffic? (Roy Sigurd Karlsbakk)

[Constantine Filin]

Roy -

> once again, I'm trying to find a good way to speed up RTP bridging. 
> in real-world environments where more than 50% of the clients are 
> behind NAT, one cannot just use reinvites because of NAT problems, 
> audio disappears etc. so, since NAT implies the need for bridging RTP 
> somehow. The current implementation with the good-old recvfrom/sendto 
> is inefficient. the use of these calls makes a overwhelming overhead 
> in kernel-space due to context-switching between user and kernel. I'm 
> just thinking using sendfile or something like it would be useful, 
> since there's hardly anything like a mmap for udp.
 
I do not know what sendfile can do, but just keep me in the loop on your
effort as I am also looking into optimizting RTP performance in asterisk.
 
I've got some code that shaves off a few CPU cycles in RTP bridging in user 
space but you are right - the breakthrough in RTP brigding should in done on 
the kernel. Please don't hesitate to contact me if you need someone who can 
code and test a few things.
 
Thanks
 
-c

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