[Xiaomi Redmi Note 4 Guides, News, & Discussion] svbarbosa:
This post includes some of my previous compilations. You may find them interesting, but rom and kernel builds are old for obvious reasons.

The following was posted on 14-01-2018, see original post

here

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I have just finished testing [MENTION=4896512]Alexey71[/MENTION]1's Velvet 6.5 kernel that came with RR-N-v5.8.5-20180109-mido-Final new led driver.

Here are the results:

Comparing to Velvet 5.5 battery drain has improved a little and performance is the same.

I did not experience any problems copying files with this build. I use Root Explorer.

Please note that this is not the latest build. Running these benchmarks take a long time and it is difficult to keep up with Alexey711.

The following was posted on 06-01-2018, see original post

here

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Here is my latest compilation of PC Mark Battery Life Benchmarks to compare currently available kernels for the Redmi Note 4

If you haven´t read my previous posts and need more info on PC Mark read the explanation at the end of this post.

This time let´s start with the results:

All test were done with [MENTION=4896512]Alexey71[/MENTION]'s RR-N-v5.8.5-20171219-mido-Final new led driver, using stock kernel and the available custom kernels at this moment.

There is one kernel missing: Stormguard. Unfortunately if failed to complete the benchmarks too many times.

Again there is no clear winner.

if your main goal is battery life and you don't worry about sacrificing some performance your kernel of choice should be Velvet, with an average SOT of 13:28 hours and average performance score of 4092. Good alternatives are Revolt kernel, with 12:52 SOT and 4239 performance, and Xenial kernel, with 12:40 and 4272. Both had more consistent results then Velvet.

If you are looking for the best performance then ZPX Inferno should be your kernel, with an average performance score of 4822 and an average SOT of 12:07 hours. ZPX had almost no variation in SOT between runs, with a mere 0,1% variation.

For a balance between battery and performance the best choices are ElectraBlue, with 4677 and 11:59 and RR Stock kernel, with 4623 and 12:14.

It took almost two weeks to run these tests with two midos dedicated for it 24/7!

This time I calibrated the brightness output of each kernel to 200 lux, as required by PC Mark, so results are better suited for comparison.

Now some words on benchmarks and PC Mark:

Benchmark results are usually misleading, but PC Mark battery life benchmark shines by using day to day tasks to measure phone performance and battery drain. It repeats a series of tasks including web browsing, photo and video editing, text editing and data manipulation.

For these runs I started the benchmarks with battery precisely at 85% and the test automatically stops when battery reaches 20%, so the test consumes 65% of the battery charge. Of course the screen is always on during the whole test.

If you want to learn more about PC Mark take a look at the site:

PC Mark for Android

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Where to get the kernels:

Stock/RRN -

Alexey71's AFH

Revolt -

[Kernel][mido] ReVolt Kernel [Los/Aosp]

ElectraBlue -

[KERNEL][mido] ElectraBlue Kernel 8.1 For Redmi Note 4

Xenial -

[Kernel][Xenial][Mido]

Velvet -

Adesh15's Velvet AFH

ZPX Inferno -

ZeroProjectX´s mido AFH

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