qemu-x86_64 fails on A72 cores, but runs nice on A53 ones :)

[guannais]

Hello guannais,

One thing that ocurred me, looking into gcc 7.3 Documentation..

Try to compile Quemu with:

Code:

-march=armv8-a+crc -mtune=cortex-a72.cortex-a53

In this way code will be optimized for Big.Litle cluster..

Thanks for the performance advice

Since "qemu" recompiles the code on the fly it may be a problem with the code generator for ARM. What is strange is that any A72 core should be binary compatible with any A53 one, just the armv8-a instruction set.

I was compiling with those flags:

Code:

CFLAGS="-march=armv8-a+simd+crc -mtune=cortex-a53 -mfix-cortex-a53-843419 -Os -pipe"

which I inherited from the setup of my Odroid-C2.