Just a short snippet on how to activate the TRIM-capability of your SSD (archlinux).
Warning: this can compromise your systems security (more)
# nano /etc/default/grub
Edit line:
GRUB_CMDLINE_LINUX_DEFAULT="cryptdevice=/dev/sda4:archlinux-lvm"
to
GRUB_CMDLINE_LINUX_DEFAULT="cryptdevice=/dev/sda4:archlinux-lvm:allow-discards root_trim=yes ADDITIONAL KERNEL PARAMETER LIST"
After that you need to recreate your grub.cfg:
# grub-mkconfig -o /boot/grub/grub.cfg
Reboot your system.
Try running (as root) fstrim -v /
You should see an output like
645354208 Bytes was trimmed
“root_trim=yes” is only needed on encrypted devices.
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