Hi,
Just installed GRUB on my new laptop and found the new cryptodisk
feature. It seemed super convenient, so I enabled it, but what I noticed
was that GRUB takes an unreasonably long time to actually decrypt the
disk --- it takes approximately 10 seconds from the time I enter my
passphrase until GRUB says "Slot 0 opened". For comparison, booting the
system itself (which involves opening the slot again) takes less than a
second.
Does anyone have any idea about why it is so slow and what I can do
about it? I'd be happy to at least manage to profile it somehow, e.g. by
enabling debugging output and looking at whether the slow part is the
PBKDF, the key recovery, or something else, but I don't know how to
enable debug mode, since this happens before grub.cfg can be read.
Thanks!
-Aleksejs
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