Ideal setting of "fastcgi_buffers" with large files

Phillip Oldham phill at
Thu Dec 3 11:33:57 MSK 2009

w3wsrmn wrote:
> Howdy,
> For cases when large files are served via FastCGI, what might be the ideal settings for the "fastcgi_buffers" directive, in order to prevent the warning:
> "an upstream response is buffered to a temporary file /usr/local/nginx/fastcgi_temp/0/00/0000000000 while reading upstream" ?
> For example, to prevent the warning when serving a 6144 kilobyte file, which of the three methods would yield the best performance?
> A large number of small buffers:
> fastcgi_buffers 768 8k
> A small number of large buffers:
> fastcgi_buffers 8 768k
> A near balance between the buffers and size:
> fastcgi_buffers 64 96k
> Or does it not matter which method is used?
It would be better to tell nginx to serve the file rather than have an 
upstream/fastcgi program serve it - nginx can generally handle many, 
many more connections than your fast-cgi backend so try and make nginx 
do as much of the work as possible.

Take a look at: - using this means 
your PHP/fast-cgi thread can exit once it's returned the header and then 
move on to accept another connection.


*Phillip B Oldham*
phill at <mailto:phill at>



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