Max file descriptor needed by nginx

[Vincent MAUGE]

Hey,

I have a question concerning max file descriptor need by nginx.
The page http://wiki.nginx.org/NginxHttpEventsModule#worker_connections
said that nginx use one pool for internet connection. But which pool
is used to open file ?

I use nginx as reverse proxy with lot of of post request. Is the
following caclul correct ?
max_fd = worker_connections + max_upload
=>  max_fd = worker_connections + worker_connections / 2


Regards,

Vincent