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Re: SO_BUSY_POLL for latency critical cases

Donatas Abraitis
February 04, 2017 08:46AM
Sorry, what is `with.min` and `without.min` in this case?

On Thu, Feb 2, 2017 at 2:47 PM, Maxim Dounin <mdounin@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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> nginx mailing list
> nginx@nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx
>



--
Donatas
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Subject Author Posted

Re: SO_BUSY_POLL for latency critical cases

Donatas Abraitis February 04, 2017 08:46AM



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