From: Rusty Russell <redacted>
Date: Thu, 4 Jun 2009 13:24:57 +0930

On Thu, 4 Jun 2009 06:32:53 am Eric Dumazet wrote:

quoted

Also, taking a reference on socket for each xmit packet in flight is very
expensive, since it slows down receiver in __udp4_lib_lookup(). Several
cpus are fighting for sk->refcnt cache line.

Now we have decent dynamic per-cpu, we can finally implement bigrefs.  More 
obvious for device counts than sockets, but perhaps applicable here as well?

It might be very beneficial for longer lasting, active, connections, but
for high connection rates it's going to be a lose in my estimation.