For further reading on this subject, many of the books I've recommended in previous chapters still apply.
For additional insight, though, you can look at ASP.NET Core 1.0 High Performance, James Singleton, Packt Publishing. While the subject of that book is specifically application-layer network programming, he addresses the performance benefits of managing direct connection I/O, and the subject may be of interest. You can find it through Packt Publishing, here: https://www.packtpub.com/application-development/aspnet-core-10-high-performance.