>They size the zram device to 100% of your physical RAM, capped at 8GB. You may be wondering how that makes any sense at all – how can one have a swap device that's potentially the entire size of one's RAM?

zram size applies to uncompressed data, real usage is dynamically growing (plus static bookkeeping). Most memory compresses well, so you probably want to have zram device size even larger than physical RAM.