Hi, from nginx wiki:

directio syntax: directio [size|off] default: directio off context: http, server, location The directive enables use of flags O_DIRECT (FreeBSD, Linux), F_NOCACHE (Mac OS
X) or directio() function (Solaris) for reading files with size greater than
specified. This directive disables use of
sendfile<http://wiki.nginx.org/HttpCoreModule#sendfile> for this request. This
directive may be useful for big files: directio 4m;

I have in my config: directio 0;

(I do not want to cache anything in ram)

But ater 5 mins of nginx running:

free -m total used free shared buffers cached Mem: 7994 1980 6014 0 255 1033 -/+ buffers/cache: 691 7303

(cached is going up and up)

Is something else needed or is it just not working?

OS: 2.6.35-28-generic #50-Ubuntu SMP Fri Mar 18 18:42:20 UTC 2011 x86_64 GNU/Linux

Many thanks as always