linux-kernel - Re: [PATCHv3 0/9] sched/fair: Migrate 'misfit' tasks on asymmetric capacity systems

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Date:   Wed, 4 Jul 2018 11:33:24 +0100
From:   Morten Rasmussen <morten.rasmussen@....com>
To:     Gaku Inami <gaku.inami.xh@...esas.com>
Cc:     "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "valentin.schneider@....com" <valentin.schneider@....com>,
        "dietmar.eggemann@....com" <dietmar.eggemann@....com>,
        "vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 0/9] sched/fair: Migrate 'misfit' tasks on asymmetric
 capacity systems

Hi,

On Tue, Jul 03, 2018 at 02:28:28AM +0000, Gaku Inami wrote:
> Hi,
> 
> > -----Original Message-----
> > From: Morten Rasmussen <morten.rasmussen@....com>
> > Sent: Wednesday, June 20, 2018 6:06 PM
> > To: peterz@...radead.org; mingo@...hat.com
> > Cc: valentin.schneider@....com; dietmar.eggemann@....com; vincent.guittot@...aro.org; Gaku Inami
> > <gaku.inami.xh@...esas.com>; linux-kernel@...r.kernel.org; Morten Rasmussen <morten.rasmussen@....com>
> > Subject: [PATCHv3 0/9] sched/fair: Migrate 'misfit' tasks on asymmetric capacity systems
> [snip]
> > 
> > The patches have been tested on:
> >    1. Arm Juno (r0): 2+4 Cortex A57/A53
> >    2. Hikey960: 4+4 Cortex A73/A53
> > 
> > Test case:
> > Big cpus are always kept busy. Pin a shorter running sysbench tasks to
> > big cpus, while creating a longer running set of unpinned sysbench
> > tasks.
> 
> I have tested v3 patches on Renesas SoC again. It looks fine.
> 
> You can add:
> 
> Tested-by: Gaku Inami <gaku.inami.xh@...esas.com>
> 
> The patches have been tested on:
>    3. Renesas R-Car H3 : 4+4 Cortex A57/A53
> 
> Results:
> Single runs with completion time of each task
> R-Car H3 (tip)
>     total time:                          0.9391s
>     total time:                          0.9865s
>     total time:                          1.3691s
>     total time:                          1.6740s
> 
> R-Car H3 (misfit)
>     total time:                          0.9368s
>     total time:                          0.9475s
>     total time:                          0.9471s
>     total time:                          0.9505s
> 
> 10 run summary (tracking longest running task for each run)
> 	R-Car H3
> 	avg	max
> tip     1.6742  1.6750
> misfit  0.9784  0.9905

Thanks for testing again. I have just posted v4 with some minor changes.
Behaviour for the test-cases should be the same.

Morten