Re: [RESEND PATCH v2 0/2] Enable Odroid-XU3/4 to use Energy Model and Energy Aware Scheduler

[Lukasz Luba]

Hi Krzysztof,

On 2/20/20 6:00 PM, Krzysztof Kozlowski wrote:
> On Thu, Feb 20, 2020 at 09:56:34AM +0000, Lukasz Luba wrote:
> > Hi all,
> >
> > This is just a resend, now with proper v2 in the patches subject.
> >
> > The Odroid-XU4/3 is a decent and easy accessible ARM big.LITTLE platform,
> > which might be used for research and development.
> >
> > This small patch set provides possibility to run Energy Aware Scheduler (EAS)
> > on Odroid-XU4/3 and experiment with it.
> >
> > The patch 1/2 provides 'dynamic-power-coefficient' in CPU DT nodes, which is
> > then used by the Energy Model (EM).
> > The patch 2/2 enables SCHED_MC (which adds another level in scheduling domains)
> > and enables EM making EAS possible to run (when schedutil is set as a CPUFreq
> > governor).
> >
> > 1. Test results
> >
> > Two types of different tests have been executed. The first is energy test
> > case showing impact on energy consumption of this patch set. It is using a
> > synthetic set of tasks (rt-app based). The second is the performance test
> > case which is using hackbench (less time to complete is better).
> > In both tests schedutil has been used as cpufreq governor. In all tests
> > PROVE_LOCKING has not been compiled into the kernels.
> >
> > 1.1 Energy test case
> >
> > 10 iterations of 24 periodic rt-app tasks (16ms period, 10% duty-cycle)
> > with energy measurement. The cpufreq governor - schedutil. Unit is Joules.
> > The energy is calculated based on hwmon0 and hwmon3 power1_input.
> > The goal is to save energy, lower is better.
> >
> > +-----------+-----------------+------------------------+
> > |           | Without patches | With patches           |
> > +-----------+--------+--------+----------------+-------+
> > | benchmark |  Mean  | RSD*   | Mean           | RSD*  |
> > +-----------+--------+--------+----------------+-------+
> > | 24 rt-app |  21.56 |  1.37% |  19.85 (-9.2%) | 0.92% |
> > |    tasks  |        |        |                |       |
> > +-----------+--------+--------+----------------+-------+
> >
> > 1.2 Performance test case
> >
> > 10 consecutive iterations of hackbench (hackbench -l 500 -s 4096),
> > no delay between two successive executions.
> > The cpufreq governor - schedutil. Units in seconds.
> > The goal is to see not regression, lower completion time is better.
> >
> > +-----------+-----------------+------------------------+
> > |           | Without patches | With patches           |
> > +-----------+--------+--------+----------------+-------+
> > | benchmark | Mean   | RSD*   | Mean           | RSD*  |
> > +-----------+--------+--------+----------------+-------+
> > | hackbench |  8.15  | 2.86%  |  7.95 (-2.5%)  | 0.60% |
> > +-----------+--------+--------+----------------+-------+
> >
> > *RSD: Relative Standard Deviation (std dev / mean)
>
> Nice measurements!

Glad to hear that.

> Applied both, thank you.
>
> Best regards,
> Krzysztof

Thank you for applying this.

Regards,
Lukasz