# Unknown directive "aio" in Nginx 0.8.14 **URL:** \ **Category:** NGINX\ **Created:** [September 10, 2009, 11:26am UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267 "2009-09-10T11:26:14Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 11:26am UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/1 "2009-09-10T11:26:14Z")
Hi all, I installed Nginx 0.8.14 to try out a new feature: AIO support. Also, I compiled Nginx with --with-file-aio However, Nginx show warnings that it does not support AIO: Starting nginx: [emerg]: unknown directive “aio” in /usr/local/nginx/nginx.conf:46 Here is my configuration ``` location ~* ^\/files\/(.+) { alias /home/files/$1; internal; aio on; # sendfile off; directio 512; } ``` Is this feature experimental and withdrawn? ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 12:33pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/2 "2009-09-10T12:33:33Z")
Hello! On Thu, Sep 10, 2009 at 11:26:14AM +0200, Dinh P. wrote: > Here is my configuration > > ``` > location ~* ^\/files\/(.+) { > alias /home/files/$1; > internal; > aio on; > # sendfile off; > directio 512; > } > > ``` > > Is this feature experimental and withdrawn? No, the feature is here. Looks like you are running wrong binary (or doesn’t compiled it properly). Maxim D. ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 12:40pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/3 "2009-09-10T12:40:35Z")
On Thu, Sep 10, 2009 at 11:26:14AM +0200, Dinh P. wrote: > Here is my configuration > > ``` > location ~* ^\/files\/(.+) { > alias /home/files/$1; > internal; > aio on; > # sendfile off; > directio 512; > } > > ``` > > Is this feature experimental and withdrawn? Could you show this ./configure line: checking for Linux AIO support … ? Probabaly, your kernel does not support eventfd(), it’s available since 2.6.22 only. BTW, instead of ``` location ~* ^\/files\/(.+) { alias /home/files/$1; ``` it’s better to use just ``` location /files/ { root /home; ``` ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 2:14pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/4 "2009-09-10T14:14:06Z")
Hi Igor Here is the output after I run ./configure checking for OS - Linux 2.6.18-128.2.1.el5 i686 checking for C compiler … found - using GNU C compiler - gcc version: 4.1.2 20080704 (Red Hat 4.1.2-44) checking for gcc -pipe switch … found checking for gcc variadic macros … found checking for C99 variadic macros … found checking for unistd.h … found checking for inttypes.h … found checking for limits.h … found checking for sys/filio.h … not found checking for sys/param.h … found checking for sys/mount.h … found checking for sys/statvfs.h … found checking for crypt.h … found checking for Linux specific features checking for epoll … found checking for sendfile() … found checking for sendfile64() … found checking for sys/prctl.h … found checking for prctl(PR\_SET\_DUMPABLE) … found checking for sched\_setaffinity() … found checking for crypt\_r() … found checking for sys/vfs.h … found checking for nobody group … found checking for poll() … found checking for /dev/poll … not found checking for kqueue … not found checking for crypt() … not found checking for crypt() in libcrypt … found checking for O\_DIRECT … found checking for F\_NOCACHE … not found checking for directio() … not found checking for statfs() … found checking for statvfs() … found checking for dlopen() … not found checking for dlopen() in libdl … found checking for sched\_yield() … found checking for PCRE library … found checking for system md library … not found checking for system md5 library … not found checking for OpenSSL md5 crypto library … found checking for zlib library … found creating objs/Makefile checking for int size … 4 bytes checking for long size … 4 bytes checking for long long size … 8 bytes checking for void \* size … 4 bytes checking for uint64\_t … found checking for sig\_atomic\_t … found checking for sig\_atomic\_t size … 4 bytes checking for socklen\_t … found checking for in\_addr\_t … found checking for in\_port\_t … found checking for rlim\_t … found checking for uintptr\_t … uintptr\_t found checking for system endianess … little endianess checking for size\_t size … 4 bytes checking for off\_t size … 8 bytes checking for time\_t size … 4 bytes checking for setproctitle() … not found checking for pread() … found checking for pwrite() … found checking for strerror\_r() … found but is not working checking for gnu style strerror\_r() … found checking for localtime\_r() … found checking for posix\_memalign() … found checking for memalign() … found checking for mmap(MAP\_ANON|MAP\_SHARED) … found checking for mmap(“/dev/zero”, MAP\_SHARED) … found checking for System V shared memory … found checking for struct msghdr.msg\_control … found checking for ioctl(FIONBIO) … found checking for struct tm.tm\_gmtoff … found checking for struct dirent.d\_namlen … not found checking for struct dirent.d\_type … found Configuration summary - using system PCRE library - OpenSSL library is not used - md5: using system crypto library - sha1 library is not used - using system zlib library nginx path prefix: “/usr/local/nginx” nginx binary file: “/usr/local/nginx/sbin/nginx” nginx configuration prefix: “/usr/local/nginx/conf” nginx configuration file: “/usr/local/nginx/conf/nginx.conf” nginx pid file: “/usr/local/nginx/logs/nginx.pid” nginx error log file: “/usr/local/nginx/logs/error.log” nginx http access log file: “/usr/local/nginx/logs/access.log” nginx http client request body temporary files: “client\_body\_temp” nginx http proxy temporary files: “proxy\_temp” nginx http fastcgi temporary files: “fastcgi\_temp” It says nothing about Linux AIO. Also, directio is said not to be found. I am using CentOS 5.3 with libaio, libaio-devel installed. It seems that the kernel equipped with CentOS 5.3/Redhat ES 5.3 is too old to support this feature. Thanks, Dinh Igor S. wrote: > On Thu, Sep 10, 2009 at 11:26:14AM +0200, Dinh P. wrote: > > Could you show this ./configure line: > checking for Linux AIO support … > ? > > Probabaly, your kernel does not support eventfd(), it’s available since > 2.6.22 only. ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 12:42pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/5 "2009-09-10T12:42:55Z")
Hello! On Thu, Sep 10, 2009 at 01:40:35PM +0400, Igor S. wrote: > > /usr/local/nginx/nginx.conf:46 > > > > Is this feature experimental and withdrawn? > > Could you show this ./configure line: > checking for Linux AIO support … > ? > > Probabaly, your kernel does not support eventfd(), it’s available since > 2.6.22 only. Oops, looking at configure code - it doesn’t fail when it’s unable to find any AIO support with --with-file-aio. I think it should. Maxim D. ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 3:04pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/6 "2009-09-10T15:04:35Z")
On Thu, Sep 10, 2009 at 01:54:20PM +0400, Maxim D. wrote: > Oops, looking at configure code - it doesn’t fail when it’s unable > to find any AIO support with --with-file-aio. > > I think it should. You are right, it will be fixed in the next release. ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 3:19pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/7 "2009-09-10T15:19:49Z")
On Thu, Sep 10, 2009 at 04:36:49PM +0400, Igor S. wrote: > > I am using CentOS 5.3 with libaio, libaio-devel installed. It seems that > > the kernel equipped with CentOS 5.3/Redhat ES 5.3 is too old to support > > this feature. > > nginx requires eventfd() support in AIO. BTW, nginx does not requires libaio at all. It uses direct syscalls. ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 3:04pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/8 "2009-09-10T15:04:36Z")
On Thu, Sep 10, 2009 at 02:14:06PM +0200, Dinh P. wrote: > Hi Igor > > Here is the output after I run ./configure > > checking for OS > > - Linux 2.6.18-128.2.1.el5 i686 This kernel has no eventfd() support. > checking for sys/param.h … found > checking for crypt\_r() … found > checking for statfs() … found > checking for statvfs() … found > checking for dlopen() … not found > checking for dlopen() in libdl … found > checking for sched\_yield() … found It’s strange: if you add --with-file-aio, you should see here: checking for kqueue AIO support … not found checking for Linux AIO support … not found > checking for uint64\_t … found > checking for time\_t size … 4 bytes > checking for System V shared memory … found > > - sha1 library is not used > nginx http proxy temporary files: “proxy\_temp” > nginx http fastcgi temporary files: “fastcgi\_temp” > > It says nothing about Linux AIO. Also, directio is said not to be found. Conversely found: checking for O\_DIRECT … found You probably mixed up with F\_NOCACHE which is MacOSX feature. > I am using CentOS 5.3 with libaio, libaio-devel installed. It seems that > the kernel equipped with CentOS 5.3/Redhat ES 5.3 is too old to support > this feature. nginx requires eventfd() support in AIO. ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [September 10, 2009, 3:45pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/9 "2009-09-10T15:45:00Z")
Dinh P. escreveu: > Hi Igor > > Here is the output after I run ./configure > > checking for OS > > - Linux 2.6.18-128.2.1.el5 i686 Nothing can be more clear, your kernel does not suppport AIO → Linux 2.6.18 Upgrade your kernel to 2.6.22 or newer! > > Probabaly, your kernel does not support eventfd(), it’s available since > > 2.6.22 only. Best regards, Ranier Vilela ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [May 24, 2010, 11:33pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/10 "2010-05-24T23:33:42Z")
Sorry, I can’t seem to edit a post. This: Upon closer examination, it says checking for AIO… not found. I also notice directio says not found, and I want to use directio feature as well. Should be: Upon closer examination, it says checking for AIO… found. I also notice directio says not found, and I want to use directio feature as well. In other words, it says “AIO… found” yet it doesn’t work. Mike Posted at Nginx Forum: > **[Re: unknown directive "aio" in Nginx 0.8.14](https://forum.nginx.org/read.php?2,6237,89826#msg-89826)** > > Hi all, I installed Nginx 0.8.14 to try out a new feature: AIO support. Also, I compiled Nginx with --with-file-aio However, Nginx show warnings that it does not support AIO: Starting nginx: \[emerg\]: unknown directive "aio" in /usr/local/n ---
**Author:** ![pcdinh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/76d3ee/32.png) [@pcdinh](https://www.ruby-forum.com/u/pcdinh)\ **Post date:** [May 24, 2010, 11:26pm UTC](https://www.ruby-forum.com/t/unknown-directive-aio-in-nginx-0-8-14/175267/11 "2010-05-24T23:26:40Z")
I am having a similar problem and could use some help. nginx 0.8.36 on Ubuntu 10.04 LTS, 2.6.32-21. When I compile with --with-file-aio, it compiles fine but doesn’t work: ```auto Restarting nginx: [emerg]: unknown directive "aio" in /etc/nginx/nginx.conf:16 configuration file /etc/nginx/nginx.conf test failed ``` Upon closer examination, it says checking for AIO… not found. I also notice directio says not found, and I want to use directio feature as well. ```auto checking for OS + Linux 2.6.32-21-server x86_64 checking for C compiler ... found + using GNU C compiler + gcc version: 4.4.3 (Ubuntu 4.4.3-4ubuntu5) checking for gcc -pipe switch ... found checking for gcc builtin atomic operations ... found checking for gcc variadic macros ... found checking for C99 variadic macros ... found checking for unistd.h ... found checking for inttypes.h ... found checking for limits.h ... found checking for sys/filio.h ... not found checking for sys/param.h ... found checking for sys/mount.h ... found checking for sys/statvfs.h ... found checking for crypt.h ... found checking for Linux specific features checking for epoll ... found checking for sendfile() ... found checking for sendfile64() ... found checking for sys/prctl.h ... found checking for prctl(PR_SET_DUMPABLE) ... found checking for sched_setaffinity() ... found checking for crypt_r() ... found checking for sys/vfs.h ... found checking for nobody group ... not found checking for nogroup group ... found checking for poll() ... found checking for /dev/poll ... not found checking for kqueue ... not found checking for crypt() ... not found checking for crypt() in libcrypt ... found checking for F_READAHEAD ... not found checking for posix_fadvise() ... found checking for O_DIRECT ... found checking for F_NOCACHE ... not found checking for directio() ... not found checking for statfs() ... found checking for statvfs() ... found checking for dlopen() ... not found checking for dlopen() in libdl ... found checking for sched_yield() ... found checking for kqueue AIO support ... not found checking for Linux AIO support ... found checking for PCRE library ... found checking for system md library ... not found checking for system md5 library ... not found checking for OpenSSL md5 crypto library ... found checking for zlib library ... found creating objs/Makefile checking for int size ... 4 bytes checking for long size ... 8 bytes checking for long long size ... 8 bytes checking for void * size ... 8 bytes checking for uint64_t ... found checking for sig_atomic_t ... found checking for sig_atomic_t size ... 4 bytes checking for socklen_t ... found checking for in_addr_t ... found checking for in_port_t ... found checking for rlim_t ... found checking for uintptr_t ... uintptr_t found checking for system endianess ... little endianess checking for size_t size ... 8 bytes checking for off_t size ... 8 bytes checking for time_t size ... 8 bytes checking for setproctitle() ... not found checking for pread() ... found checking for pwrite() ... found checking for strerror_r() ... found but is not working checking for gnu style strerror_r() ... found checking for sys_errlist[] ... found checking for localtime_r() ... found checking for posix_memalign() ... found checking for memalign() ... found checking for mmap(MAP_ANON|MAP_SHARED) ... found checking for mmap("/dev/zero", MAP_SHARED) ... found checking for System V shared memory ... found checking for struct msghdr.msg_control ... found checking for ioctl(FIONBIO) ... found checking for struct tm.tm_gmtoff ... found checking for struct dirent.d_namlen ... not found checking for struct dirent.d_type ... found Configuration summary + using system PCRE library + OpenSSL library is not used + md5: using system crypto library + sha1 library is not used + using system zlib library nginx path prefix: "/etc/nginx" nginx binary file: "/etc/nginx/sbin/nginx" nginx configuration prefix: "/etc/nginx" nginx configuration file: "/etc/nginx/nginx.conf" nginx pid file: "/var/run/nginx.pid" nginx error log file: "/var/log/nginx/error.log" nginx http access log file: "/var/log/nginx/access.log" nginx http client request body temporary files: "client_body_temp" nginx http proxy temporary files: "proxy_temp" nginx http fastcgi temporary files: "fastcgi_temp" ``` Help? Mike Posted at Nginx Forum: > **[Re: unknown directive "aio" in Nginx 0.8.14](https://forum.nginx.org/read.php?2,6237,89821#msg-89821)** > > Hi all, I installed Nginx 0.8.14 to try out a new feature: AIO support. Also, I compiled Nginx with --with-file-aio However, Nginx show warnings that it does not support AIO: Starting nginx: \[emerg\]: unknown directive "aio" in /usr/local/n