Replacing zram with zswap

[NicolasDorier]

I was reading this blog post by a kernel developer which advise zwap. I will try on my laptop, but it seems to me a good idea.

So I have replaced it in my system.
I don't know if that's worth it or not, no complains so far, but it's not like I see obvious difference. So I will not make a PR, but just documenting things here in case somebody decide to tackle it.

The steps I've done:

Turn off zram

sudo systemctl mask systemd-zram-setup@zram0.service
sudo rm /etc/systemd/zram-generator.conf
sudo swapoff /dev/zram0 2>/dev/null

Increase size of my swapfile

Sorry, but that steps depends about whether you have a swapfile configured by hybernation, so I won't document here.

The size is RAM + 50%. This is probably overkill, but whatever.

Enable zswap during runtime

echo 1 | sudo tee /sys/module/zswap/parameters/enabled

Enable zswap when rebooting (Kernel)

In /etc/limine-entry-tool.d/zswap.conf

KERNEL_CMDLINE[default]+=" zswap.enabled=1"

Then

sudo limine-mkinitcpio

Troubleshot

You can see if it works with

sudo grep -r . /sys/kernel/debug/zswap/

As page get swapped, counters go up!