Memory not correct shown

[ragnar76]

Hi there,

i have a raspi 4 with 8 Gig of memory but linuxlogo shows only 4 Gig.

[deater]

getting a proper memory size value is one of the more difficult things you can do on Linux.

With the 8GB Pi it's harder as a 32-bit OS can only access more than 4GB with hacks so most of the memory reporting mechanisms aren't going to handle it well.

does /proc/meminfo have proper values? Does the top utility report the proper amount of RAM?

[ragnar76]

Hi, good morning.

Yes, i know how hard it was to use more than 4gb on a 32-bit system. back in the old days we had to struggle with big and pae kernels but in the raspi... i dont really know how it is managed there.

However, meminfo and top displays (some kind of) the same values

[deater]

if you edit libsysinfo-0.3.0/Linux/cpuinfo_arm.c

and change the return value of get_arch_specific_mem_size() to be MEM_USE_MEMINFO instead of 0, do you get a better result?

I'll have to think about changing the default, it's probably OK I just worry it will break some other architecture. I forget if sysinfo is the default for a specific reason or not.

[chtiland]

Hello,

With version 5.11-9 (Linux Mint packages), I got this :

I didn't know i had so much RAM, that's cool 😁