Tweak fastcgi_buffer

[Maxim Dounin]

Hello!

On Wed, Jul 29, 2015 at 04:45:31PM -0400, Karl Johnson wrote:

> On Thu, Jul 23, 2015 at 3:21 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:
> 
> > Hello!
> >
> > On Wed, Jul 22, 2015 at 05:50:12PM -0400, Karl Johnson wrote:
> >
> > > Hello,
> > >
> > > I need to tweak fastcgi_buffer to 1m on a website that has heavy requests
> > > to avoid buffer. If I use a distro with 4096 pagesize, is it better to do
> > > 256x 4k or 4x 256k?
> > >
> > > [root at web ~]# getconf PAGESIZE
> > > 4096
> > > [root at web ~]#
> > >
> > > fastcgi_buffer_size 4k;
> > > fastcgi_buffers 256 4k;
> > >
> > > OR
> > >
> > > fastcgi_buffer_size 256k;
> > > fastcgi_buffers 4 256k;
> >
> > I would recommend the latter.  Or, alternatively, something like
> >
> >     fastcgi_buffers 8 128k;
> >
> > Too many small buffers will result in extra processing overhead,
> > and it's unlikely to be a good solution.
> >
> 
> Thanks for the recommendation Maxim. There's no issue setting the buffer to
> 128k when the pagesize is 4k?

No issues, though large buffers imply some memory waste when last 
buffer isn't fully used.  So usually you should consider some 
balance between number of buffers and their size.  

-- 
Maxim Dounin
http://nginx.org/