Maxim Dounin Wrote:
-------------------------------------------------------
> Hello!
>
> On Sat, Jun 28, 2014 at 12:38:12AM -0400, c0nw0nk wrote:
>
> > Latest picture
> > http://s633.photobucket.com/user/C0nw0nk/media/Untitled-7.png.html
> >
> > Everything utilizing the read's and writes is nginx and when i set
> the
> > following buffers i get massive spikes like that.
> >
> > location ~ \.mp4$ {
> > mp4;
> > mp4_buffer_size 9000m;
> > mp4_max_buffer_size 9000m;
> > }
>
> Note that when using mp4 module, you should not set
> mp4_buffer_size too high. It's initial size of a buffer used to
> read mp4 files, and if a value specified is bigger than size of
> the moov atom in an mp4 file, reading extra bytes will be
> meaningless. It is generally recommended to set it to something
> like 512k (the default) or slightly larger (1m, 2m). Larger
> values make sense only if most of your mp4 files have huge moov
> atoms.
>
> Note well that if you use mp4 pseudo streaming, you should make
> sure that mp4 files are correctly prepared - i.e., with moov atom
> placed before mdat. While nginx will be able to work with files
> with moov atom at the end, it won't be able to do this
> efficiently.
>
> --
> Maxim Dounin
> http://nginx.org/
>
> _______________________________________________
> nginx mailing list
> nginx@nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx


All videos are already set out like that i also use the following python script to ensure that they have meta data at the start of the file instead of the end. https://gist.github.com/marpada/12e7d4a093aec402a989

I did a simple test to confirm it is I/O usage due to large files i run nginx same traffic conditions but i block "deny all;" to mp4, flv files and my i/o usage by nginx is about 1mb max and a few kb so i can confirm it is large files that are doing it i am currently looking into what would be better for me a SSD or a SAS 15K RPM.