nginx [emerg] 13513#0: eventfd() failed (38: Function not implemented)

[emerg] 13513#0: eventfd() failed (38: Function not implemented)

原因是：编译时带了--with-file-aio模块，这个要linux 2.6.22以后内核才支持．服务器是2.6.18.

nginx -V　可以看到编译参数．下载nginx源码，使用nginx -V编译参数去了--with-file-aio模块．编译安装后问题解决．