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

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Date:   Fri, 19 Apr 2019 10:40:27 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Subhra Mazumdar <subhra.mazumdar@...cle.com>
Cc:     Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
        pjt@...gle.com, tim.c.chen@...ux.intel.com,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        fweisbec@...il.com, keescook@...omium.org, kerrnel@...gle.com,
        Vineeth Pillai <vpillai@...italocean.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Aaron Lu <aaron.lu@...ux.alibaba.com>
Subject: Re: [RFC][PATCH 13/16] sched: Add core wide task selection and
 scheduling.


* Subhra Mazumdar <subhra.mazumdar@...cle.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