[Live-devel] Zero-copy RTP server?

[Chris Wein]

I have not looked at the livemedia code in depth but my impression is 
that it is not easy to do a true zero-copy RTP server on linux.  I have 
a zero copy stack for raw UDP using an ethernet controller with h/w 
checksum and scatter-gather DMA (transmit gathers the header and the 
payload separately from different addresses) but I am assuming that the 
live libraries have at least one copy to combine the RTP header and the 
payload.  Is this impression correct?  If so do people think that the 
live libraries are a good place to start to implement a zero copy server 
with the ethernet controller doing gather of udp header, rtp header, and 
payload?  Presumably this means running most of the stack in kernel 
rather than in user.