Nginx Optimization: understanding sendfile, tcp_nodelay and tcp_nopush

This article a is translation by popular request of Optimisations Nginx, bien comprendre sendfile, tcpnodelay et tcpnopush I wrote in French in January. Most articles dealing with optimizing Nginx performances recommend to use sendfile, tcp_nodelay and tcp_nopush options in the nginx.conf configuration file. Unfortunately, almost none of them tell neither how they impact the Web server nor how the