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
