0.8.52 AIO problem

[Brane F. Gračnar]

Hello!

I'm using nginx for serving static content. Nginx is serving from a folder 
containing millions of small files.

Becouse machine doesn't have lots of ram (2G) and becouse access pattern is 
completely random VFS cache gets trashed.

That's why i tried aio + directio.

Configuration:

location / {
	aio on;
   directio 1;
}

It seems that everything works fine, vmstat reports smaller cache size, etc. 
But number of opened filedescriptors on system grows and nginx status module 
reports more and more connections in state "writing".

Nginx main error contains tons of familiar messages:

--- snip ---
2010/10/06 17:48:42 [alert] 1589#0: open socket #307 left in connection 128
2010/10/06 17:48:42 [alert] 1589#0: open socket #313 left in connection 131
2010/10/06 17:48:42 [alert] 1589#0: open socket #297 left in connection 132
2010/10/06 17:48:42 [alert] 1589#0: open socket #312 left in connection 133
2010/10/06 17:48:42 [alert] 1589#0: open socket #364 left in connection 134
2010/10/06 17:48:42 [alert] 1589#0: open socket #394 left in connection 136
2010/10/06 17:48:42 [alert] 1589#0: open socket #321 left in connection 138
2010/10/06 17:48:42 [alert] 1589#0: open socket #320 left in connection 139
2010/10/06 17:48:42 [alert] 1589#0: open socket #260 left in connection 141
2010/10/06 17:48:42 [alert] 1589#0: open socket #336 left in connection 145
2010/10/06 17:48:42 [alert] 1589#0: open socket #340 left in connection 148
2010/10/06 17:48:42 [alert] 1589#0: open socket #347 left in connection 149
--- snip ---

Am i doing something wrong?

nginx version: nginx/0.8.52
TLS SNI support enabled
configure arguments: --with-cc-opt='-O2 -pipe -fomit-frame-pointer -funroll-
loops' --prefix=/usr --conf-path=/etc/nginx/nginx.conf --error-log-
path=/tmp/nginx.error --http-log-path=/tmp/nginx.access --pid-
path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --user=daemon --
group=daemon --http-client-body-temp-path=/var/spool/nginx/client_body_temp --
http-proxy-temp-path=/var/spool/nginx/proxy_temp --http-fastcgi-temp-
path=/var/spool/nginx/fastcgi_temp --with-ipv6 --with-http_ssl_module --with-
http_realip_module --with-http_addition_module --with-http_dav_module --with-
http_flv_module --with-http_gzip_static_module --with-http_random_index_module 
--with-http_secure_link_module --with-http_stub_status_module --with-mail --
with-mail_ssl_module --with-pcre --with-file-aio --add-
module=/export/tmp/pkgcompile/nginx/work/nginx-0.8.52/modules/nginx_mod_h264_streaming-2.2.7 
--add-module=/export/tmp/pkgcompile/nginx/work/nginx-0.8.52/modules/ngx-
fancyindex --add-
module=/export/tmp/pkgcompile/nginx/work/nginx-0.8.52/modules/ngx_http_log_request_speed

Linux 2.6.35, x86_64, Ubuntu 10.04LTS.

Best regards, Brane