The memory modules have lifetime warranty and before replacement arrives I'm going to try to block off bad memory from use.

I tried several articles with different memap parameters, and the following seems to work

memmap=500M!2750M

Top shows less memory available.

MiB Mem : 31851.9

This article is about something completely different but gives examples that actually work in my case.

https://docs.pmem.io/getting-started-guide/creating-development-environments/linux-environments/linux-memmap

#linux #grub #memmap #badmemory