nginx supports a variety of connection processing methods. The availability of a particular method depends on the platform used. On platforms that support several methods nginx will normally select the most efficient method automatically. However, if needed, a connection processing method can be selected explicitly with the use directive. The following connection processing methods are supported: * select — standard method. The supporting module is built automatically on platforms that lack more efficient methods. The --with-select_module and --without-select_module configuration parameters can be used to forcibly enable or disable the build of this module. * poll — standard method. The supporting module is built automatically on platforms that lack more efficient methods. The --with-poll_module and --without-poll_module configuration parameters can be used to forcibly enable or disable the build of this module. * kqueue — efficient method used on FreeBSD 4.1+, OpenBSD 2.9+, NetBSD 2.0, and macOS. * epoll — efficient method used on Linux 2.6+. > The EPOLLRDHUP (Linux 2.6.17, glibc 2.8) and EPOLLEXCLUSIVE (Linux 4.5, glibc 2.24) flags are supported since 1.11.3. > Some older distributions like SuSE 8.2 provide patches that add epoll support to 2.4 kernels. * /dev/poll — efficient method used on Solaris 7 11/99+, HP/UX 11.22+ (eventport), IRIX 6.5.15+, and Tru64 UNIX 5.1A+. * eventport — event ports, method used on Solaris 10+ (due to known issues, it is recommended using the /dev/poll method instead).