I am having some difficultly in understanding the following parameters for nginx,
Scenario (nginx is used for serving static content )

proxy_buffer_size 4k
proxy_buffers 16 32k
proxy_busy_buffers_size 64k
proxy_buffering off

I like to know if i exceed the proxy_buffer_size to lets say 128 and proxy_buffers to 4 256 does it affects nginx performance in anyway ?

if proxy_buffering is set to off, does proxy_buffers value in anyway has any affect on nginx ?