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I no longer use disk swap for servers, instead opting for Zram with a maximum is 50% of RAM capacity and a high swapiness value.

It'd be cool if Zram could apply to the RAM itself (like macOS) rather than needing a fake swap device.

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Lookie lookie! Isn't it spooky?

https://github.com/CachyOS/CachyOS-Settings/blob/master/usr/...

Resulting in https://i.postimg.cc/hP37vvpJ/screenieshottie.png

Good enough...

Yeh. I haven't yet figured out how to get zram to apply transparently to containers though, anything in another memory cgroup will never get compressed unless swap is explicitly exposed to it.

zswap

https://docs.kernel.org/admin-guide/mm/zswap.html

The cgroup accounting also now works in zswap.

Zswap requires a backing disk swap, Zram does not.

The backing disk or file will only be written to if cache eviction on the basis of LRU comes into play, which is fine because that's probably worth the write hit. The likelihood of thrashing, the biggest complaint about disk based swap, is far reduced.

zram based swap isn't free. Its efficiency depends on the compression ratio (and cost).

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