SO_BUSY_POLL for latency critical cases

[Donatas Abraitis]

Sorry, what is `with.min` and `without.min` in this case?

On Thu, Feb 2, 2017 at 2:47 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:

> Hello!
>
> On Thu, Feb 02, 2017 at 09:40:56AM +0200, Donatas Abraitis wrote:
>
> > I do not cover any tests, just putting this patchset and wanna ask if
> > someone had tried this? I tried this for Redis and changes are really
> > reasonably visible like here: https://github.com/antirez/redis/pull/3773
>
> Just a side note:
>
> The data provided in the pull request is not really convincing.
> Ministat shows no difference proven at 95% confidence for both min
> and max latency values:
>
> $ ministat with.min without.min
> x with.min
> + without.min
> +-----------------------------------------------------------
> -------------------+
> |x                                  x  x   x+ +          +              x
> +   +|
> |            |________________________AM____|____________M__A__|___________|
>  |
> +-----------------------------------------------------------
> -------------------+
>     N           Min           Max        Median           Avg        Stddev
> x   5        458752        702022        587727      585944.6     86500.993
> +   5        605029        722469        649593      659764.4     53243.639
> No difference proven at 95.0% confidence
> $ ministat with.max without.max
> x with.max
> + without.max
> +-----------------------------------------------------------
> -------------------+
> |x                                   + x   xx     +                +   +
>     *|
> |             |__________________________A_M|________________A_____M|________|
> |
> +-----------------------------------------------------------
> -------------------+
>     N           Min           Max        Median           Avg        Stddev
> x   5      26625442 2.0884278e+08 1.2690286e+08 1.2130263e+08      64656095
> +   5 1.1113228e+08 2.0951387e+08 1.8428094e+08 1.6806744e+08      40111502
> No difference proven at 95.0% confidence
>
> --
> Maxim Dounin
> http://nginx.org/
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-- 
Donatas
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