Thanks,
Now my fstab option are
rw,noatime,compress=lzo,discard,autodefrag,subvolid=257,subvol=/@
I tried to add rootflags=noatime,compress=lzo,discard,autodefrag to
GRUB_CMDLINE_LINUX in /etc/default/grub as you suggested but my system
didn't manage to boot, probably because grub automatically adds
rootflags=subvol=@ and only a single rootflags can be taken into account.
Do you have any suggestion?
Niccolò
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