On 02/07/2024 10:38, Stephen Morris wrote:
My / partition is on a 3TB hard disk and is using BTRFS. I've put /boot on an SSD, where I have /boot for Ubuntu, Drive C for windows and the UEFI partition, for hoped boot performance improvements.
I would assume the performance difference to be not noticeable. The kernel image and initrd are written once on kernel install/update and copied into RAM once at the very start of the boot process and not touched again afterwards. So except perhaps for a few seconds of boot time and a few seconds on kernel updates, there will not be any difference in performance. /boot is likely the part of your system files that gives you the least performance benefit from being placed on an SSD vs. HDD.
Grub can boot from BTRFS directly.