upstream keepalive: call for testing

Thomas Love tomlove at
Tue Aug 2 15:08:11 UTC 2011

On 29 July 2011 17:36, Maxim Dounin <mdounin at> wrote:
> With "keepalive 32;" you keep busy all of your 32 php processes
> even if there are no active requests, and there are no processes
> left to process listen queue.
> On the other hand, nginx will still try to establish new
> connection if there are no idle one sitting in connections cache
> during request processing.  Therefore some requests will enter
> php's listen queue and have no chance to leave it.  Eventually
> listen queue will overflow.
> Please also note that "keepalive 10;" means each nginx worker will
> keep up to 10 connections.  If you are running multiple workers
> you may need to use lower number.
Thanks for this. It's been running fine with keepalive 10 on four workers --
is that because there is connection overlap? Am I risking a possibility of
exhausting the 32 processes eventually?

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