IMX6Q is x6 times slower on Android 8.0.0 than on Android 4.4.3!
I use MCIMX6Q-SDB sabresd board and tinymembench tool for memory benchmarking.
And here are the results:
Tinymembench Operation | Android 4.4.3 Linux kernel 3.10.53-88098, MB/s | Android 8.0.0 Linux kernel 4.9.17-04736, MB/s |
|---|---|---|
| C fill | 2121.2 | 353.8 |
| standard memset | 2118.7 | 353.6 |
| NEON fill | 2105.5 | 353.7 |
| ARM fill (STRD) | 2120.9 | 353.9 |
As you can see only specific operations type are affected - "fill/set".
No such huge performance difference with other operation like copy-read:
Tinymembench Operation | Android 4.4.3 Linux kernel 3.10.53-88098, MB/s | Android 8.0.0 Linux kernel 4.9.17-04736, MB/s |
|---|---|---|
| C copy | 318.0 | 334.6 |
| standard memcpy | 358.7 | 370.8 |
| NEON copy | 300.5 | 310.8 |
| ARM copy prefetched (incr pld) | 402.6 | 382.8 |
Other benchmark utils like Geekbench or Antutu show the same situation with memory performance: Android 8.0.0 is much slower than Android 4.4.3.
Why does Android 8.0.0 have much lower numbers than Android 4.4.3?
What should I do to bring Android 4.4.3 performance to the Android 8.0.0 (port some drivers patches... etc.) ?
