On Wed, 2021-10-27 at 14:57 +0200, David Hildenbrand wrote:
> On 27.10.21 14:48, Joakim Tjernlund wrote:
> > Using a fairly minimal kernel I get a big difference in Reserved memory, using:
> >     qemu-system-aarch64 -machine virt -kernel arch/arm64/boot/Image -cpu cortex-a53  -nographic -m 32M
> > 
> > I get this:
> > Linux version 5.11.0
> > Memory: 24052K/32768K available (3520K kernel code, 684K rwdata, 548K rodata, 320K init, 245K bss, 8716K reserved, 0K cma-reserved)
> > 
> > Versus:
> > 
> > Linux version 5.10.75
> > Memory: 11836K/32768K available (3518K kernel code, 684K rwdata, 540K rodata, 320K init, 244K bss, 20932K reserved, 0K cma-reserved)
> > 
> > Reserving 20 MB RAM on a 32 MB is way too much, even 8Mb is a bit much for us.
> 
> Are you using comparable kernel configs? Can you share them?
> 
> Further, can you share /proc/meminfo and /proc/zoneinfo of both instances?
> 
> (eventually, memblock=debug could be helpful as well, but it generates a
> lot of data)
> 

Attaching configs, they are very similar I think.

Dumps from meminfo etc. is a bit harder as I only have initramfs ATM and that has
a huge impact on reserved memory, would that still be usable?
(numbers above is without initramfs, kernel never gets to init)

Need to figure out how to mount a FS from a JFFS2 img or similar as we have no SDA/HDA here 

 Jocke