Clarifying the ZRAM Implementation: dom0 vs. AppVMs

[corporateblush]

How To Set And Use ZRAM swap

I’d like to remind that zram has a cost when used and it’s not a magic bullet that generates usable memory out of nowhere. It reserves some memory where it’s running, so it means your system has less memory to run, and it compresses unused memory on the fly when you run out of memory. This is setup as a swap device with a higher priority than a disk backed swap, so memory goes in there. The CPU cost is real and introduce lag that could be higher than swapping to a fast SSD. I tend to o prefer …

I find it good, when having plenty of RAM, to also prevent SSD wearing off this way.