Google searches for "netmap" and "FreeBSD" will give you lots of information on pushing millions of pps through 900 MHz single-core machines. Netmap is also available on Linux. There's even a netmap-enabled version of IPFW that allows you to do packet filtering and routing completely in userspace, again will millions of pps. IPFW is also available on Linux, although I don't know if the netmap-enabled version is.
Google searches for "openconnect" and "FreeBSD" will give you lots of information and blog posts from the Netflix guys about why they picked FreeBSD, and how it all works, including details on the networking.
Google searches for "Adrian Chadd", or "RSS scaling", or similar terms will show you threads and posts on various FreeBSD mailing lists with information detailing a lot of the MSS/RSS work that's going into FreeBSD 11, and several projects that build off that. Those also have links to other information around sockets and similar.
Google searches for "NUMA" and "FreeBSD" will bring up mailing list threads that cover the different projects being undertaken to improve the CPU affinity and thread locality and all that jazz.
Sure, it would be nice if the OP had posted links to the info, but it's not like the information is secret or hard to find.