Re: [PATCH net-next 0/5] net: introduce noref sk

From: Paolo Abeni <pabeni@redhat.com>
Date: Wed, 20 Sep 2017 18:54:00 +0200

This series introduce the infrastructure to store inside the skb a socket
pointer without carrying a refcount to the socket.

Such infrastructure is then used in the network receive path - and
specifically the early demux operation.

This allows the UDP early demux to perform a full lookup for UDP sockets,
with many benefits:

- the UDP early demux code is now much simpler
- the early demux does not hit any performance penalties in case of UDP hash
  table collision - previously the early demux performed a partial, unsuccesful,
  lookup
- early demux is now operational also for unconnected sockets.

This infrastrcture will be used in follow-up series to allow dst caching for
unconnected UDP sockets, and than to extend the same features to TCP listening
sockets.

Like Eric, I find this series (while exciting) quite scary :-)

You really have to post some kind of performance numbers in your
header posting in order to justify something with these ramifications
and scale.

Thank you.