Here is announcement for the feature: https://www.nginx.com/blog/nginx-and-netflix-contribute-new-sendfile2-to-freebsd/ https://www.nginx.com/blog/nginx-and-net

Here is announcement for the feature: https://www.nginx.com/blog/nginx-and-netflix-contribute-new-sendfile2-to-freebsd/ https://www.nginx.com/blog/nginx-and-netflix-contribute-new-... And here are the slides explaining it: https://www.slideshare.net/facepalmtarbz2/new-sendfile-in-english https://www.slideshare.net/facepalmtarbz2/new-sendfile-in-en... There are video of various talks by Gleb Smirnoff explaining all this magic on YouTube. The feature is fully documented in `man 2 sendfile`, it was part of the patch that did the work.