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Re: GRUB LUKS support is slow?


From: Ludovic Courtès
Subject: Re: GRUB LUKS support is slow?
Date: Mon, 18 Dec 2017 10:39:19 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Hi,

Tobias Geerinckx-Rice <address@hidden> skribis:

> Adam Van Ymeren wrote on 16/12/17 at 00:25:
>> On December 15, 2017 5:53:15 PM EST, Mark H Weaver <address@hidden> 
>> wrote:
>>> address@hidden (Ludovic Courtès) writes:
>>> 
>>>> I have an encrypted root.  When GRUB asks me for my passphrase, 
>>>> it takes 5–10 seconds after I hit enter before it displays the
>>>> menu; then, once I've selected an entry, it takes another 5 seconds
>>>> or so to boot.
>>>> 
>>>> It’s always been this way for me (that’s on UEFI), but I’m
>>>> sufficiently annoyed to write this message today.  :-)
>>>> 
>>>> Are others experiencing this as well?  Any hints?
>>> 
>>> I also use a LUKS-encrypted root partition, and the same thing 
>>> happens to me.  I would guess that the cryptographic operations in 
>>> GRUB are not well optimized, but I haven't looked closely.
>>> 
>>> Mark
>> 
>> Even unoptimized 5-10s seems pretty long.  It's not like it has a
>> lot of data to process.
>
> Alas, you'd be wrong :-)

What’s also “reassuring” is that the searching for “grub luks slow”
suggests that the whole world is booting slowly, not just GuixSD users.
:-)

Ludo’.



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