Re: [RFC][PATCH 13/16] sched: Add core wide task selection and scheduling.

Ingo Molnar
2019-04-19T20:33:51Z

* Subhra Mazumdar <subhra.mazumdar@oracle.com> wrote:

> I see similar improvement with this patch as removing the condition I
> earlier mentioned. So that's not needed. I also included the patch for the
> priority fix. For 2 DB instances, HT disabling stands at -22% for 32 users
> (from earlier emails).
>
>
> 1 DB instance
>
> users  baseline   %idle    core_sched %idle
> 16     1          84       -4.9% 84
> 24     1          76       -6.7% 75
> 32     1          69       -2.4% 69
>
> 2 DB instance
>
> users  baseline   %idle    core_sched %idle
> 16     1          66       -19.5% 69
> 24     1          54       -9.8% 57
> 32     1          42       -27.2%        48

So HT disabling slows down the 2DB instance by -22%, while core-sched
slows it down by -27.2%?

Would it be possible to see all the results in two larger tables (1 DB
instance and 2 DB instance) so that we can compare the performance of the
3 kernel variants with each other:

- "vanilla +HT": Hyperthreading enabled, vanilla scheduler
- "vanilla -HT": Hyperthreading disabled, vanilla scheduler
- "core_sched": Hyperthreading enabled, core-scheduling enabled

?

Thanks,

Ingo