linux-kernel - RE: [PATCHv4 00/12] sched/fair: Migrate 'misfit' tasks on asymmetric capacity systems

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Date:   Mon, 20 Aug 2018 02:50:45 +0000
From:   Gaku Inami <gaku.inami.xh@...esas.com>
To:     Morten Rasmussen <morten.rasmussen@....com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>
CC:     "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: [PATCHv4 00/12] sched/fair: Migrate 'misfit' tasks on asymmetric
 capacity systems

Hi,

> -----Original Message-----
> From: Morten Rasmussen <morten.rasmussen@....com>
> Sent: Wednesday, July 4, 2018 7:18 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: [PATCHv4 00/12] 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 v4 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:                          0.9488s
    total time:                          0.9766s
    total time:                          1.3243s
    total time:                          1.6740s

R-Car H3 (misfit)
    total time:                          0.9313s
    total time:                          0.9214s
    total time:                          0.9493s
    total time:                          0.9606s

10 run summary (tracking longest running task for each run)
	R-Car H3
	avg	max
tip     1.6744  1.6780
misfit  0.9616  1.0290

Also, I confirmed that these patches bring performance improvement
to some benchmarks(UnixBench, LMbench). So they have very useful
for Renesas SoC.

[snip]

Regards,
Inami