topic Re: IMX6Q poor memory performance in i.MX Processors

IMX6Q poor memory performance

denkraev — Mon, 22 Apr 2019 11:23:39 GMT

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.) ?

Re: IMX6Q poor memory performance

igorpadykov — Mon, 22 Apr 2019 23:22:48 GMT

Hi denkraev

issue may be caused by arm errata (in uboot/include/configs :

define CONFIG_ARM_ERRATA)

mx6_common.h\configs\include - uboot-imx - i.MX U-Boot

Also please check that correct image was used (from nxp official repository)

i.MX Software | NXP

Best regards
igor
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Re: IMX6Q poor memory performance

denkraev — Tue, 23 Apr 2019 13:21:04 GMT

Official images are in use.

Errata is enabled.

Re: IMX6Q poor memory performance

igorpadykov — Tue, 23 Apr 2019 13:51:59 GMT

may be useful

https://community.nxp.com/thread/371109

also performance issues and additional custom optimizations may be supported using

NXP Professional Services | NXP

Best regards
igor