nginx performance with aritificial latency - help?

[Jacob Burkamper]

This has been a bit of a learning experience for me, and as such I am not
currently too well versed in tweaking the Linux kernel's TCP code. However,
if the buffers were incorrect, I would expect to see dropped packets,
correct? I took a packet capture of a simple ApacheBench test exhibiting
the problem, but I couldn't find any evidence of dropped packets anywhere.

Even so, I'm willing to try changes. I don't suppose you could suggest some
improvements or point me in the direction of good reading? I'd appreciate
it.

On Fri, Nov 21, 2014 at 1:21 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:

> Hello!
>
> On Thu, Nov 20, 2014 at 09:49:36PM -0600, Jacob Burkamper wrote:
>
> [...]
>
> > Does anyone have any suggestions on how I can solve this? I would have
> > expected an increase in the number of connections to yield an increase in
> > speed, but this was not the result. It seems with the artificial latency
> > nginx is only able to handle approximately 3,000 requests per second,
> where
> > without the latency I saw over 7,000.
>
> Have you checked your OS limits on network buffers?  If there
> are not enough buffers or buffers are undersized, this may have
> negative effect on bandwidth with increased latency.
>
> --
> Maxim Dounin
> http://nginx.org/
>
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