>Yes, a whole 32M response will be in memory, however, I do not think that
>is right thing. You should handle the most responses in memory and allow
>to use disk for biggest ones:
I guess as of now nginx is doing this only.
I guess its safe to ignore warnings in error_log.
In optimal case, I will find less number of warnings i.e. "[warn] upstream response is buffered to a temporary file /var/lib/nginx/fastcgi/" messages.

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Rahul Bansal
EasyEngine - https://github.com/rtCamp/easyengine