Hello,

I installed a new system (16GB RAM, 512 GB SSD) with the bookworm installer, took the guided disk partitioning and selected use full disk with single partition (which is I think recommended for beginners in the installer). With that setup hibernate does not seem to work reliably, if e.g. 4 GB of the RAM are used, hibernate does not work anymore. I think it is because the installer created a swap partition on 1 GB in size. For me that seems ways to small to make hibernate work. I remember in the early Linux days the recommendation was swap partition size = 2x RAM size, here

https://wiki.debian.org/de/Hibernate

is says for hibernation, swap should be half the RAM size.

I would have expected that for an installation recommended for beginners, the basic features like hibernate would work, but the usage of the resources (SSD) might not be optimal (e.g. with a larger swap partition that needed for a tailored setup). I might miss something though on how the user/beginner should make hibernate work in bookworm.

For me it is easy to reinstall an create a bigger swap partition. I understand from the page above another option might be to create a swap file

https://wiki.debian.org/Hibernation?action=show&redirect=Hibernate

(although that the page starts with references to Debian Lenny and Jessie
raise some doubts if that still is the way to go).

Any hint or feedback is welcome, in particular if it is an issue where to report it, that this gets improved.

Thanks
Rainer
--
Rainer Dorsch
http://bokomoko.de/

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Hi,

Am 9. Juli 2023 13:18:24 MESZ schrieb Rainer Dorsch <ml@bokomoko.de>:

I installed a new system (16GB RAM, 512 GB SSD) with the bookworm installer, >took the guided disk partitioning and selected use full disk with single >partition (which is I think recommended for beginners in the installer). With >that setup hibernate does not seem to work reliably, if e.g. 4 GB of the RAM >are used, hibernate does not work anymore. I think it is because the installer
created a swap partition on 1 GB in size. For me that seems ways to small to >make hibernate work. [...]

There is already a bugreport https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987503
about this (which also has some background infos).

Sadly, nothing has happened prior the release of Bookworm.


Holger

--
Sent from /e/ OS on Fairphone3

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Rainer Dorsch <ml@bokomoko.de> (2023-07-09):

Many thanks for the quick and very helpful response. I also followed
up there, indeed it is sad that not even a simple workaround to
mitigate the problem made it into bookworm :-/

Don't allocate the whole space at the LVM step, then expand the swap
using some of that free space?


Cheers,
--
Cyril Brulebois (kibi@debian.org) <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

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Am Sonntag, 9. Juli 2023, 15:26:05 CEST schrieb Holger Wansing:

Hi,

Am 9. Juli 2023 13:18:24 MESZ schrieb Rainer Dorsch <ml@bokomoko.de>:

I installed a new system (16GB RAM, 512 GB SSD) with the bookworm >installer, took the guided disk partitioning and selected use full disk >with single partition (which is I think recommended for beginners in the >installer). With that setup hibernate does not seem to work reliably, if >e.g. 4 GB of the RAM are used, hibernate does not work anymore. I think it >is because the installer created a swap partition on 1 GB in size. For me >that seems ways to small to make hibernate work. [...]

There is already a bugreport https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987503
about this (which also has some background infos).

Sadly, nothing has happened prior the release of Bookworm.

Many thanks for the quick and very helpful response. I also followed up there, indeed it is sad that not even a simple workaround to mitigate the problem
made it into bookworm :-/

Rainer
--
Rainer Dorsch
http://bokomoko.de/

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Putting the list back in the loop, and quoting in full.

Rainer Dorsch <ml@bokomoko.de> (2023-07-09):

Am Sonntag, 9. Juli 2023, 16:55:49 CEST schrieben Sie:

Rainer Dorsch <ml@bokomoko.de> (2023-07-09):

Many thanks for the quick and very helpful response. I also followed
up there, indeed it is sad that not even a simple workaround to

^^^^^^^^^^^^^^^^^^^^^^^^^^^^

mitigate the problem made it into bookworm :-/

Don't allocate the whole space at the LVM step, then expand the swap
using some of that free space?

→ Simple workaround.

You can do that, if you realize that the recommended setup for beginners
does not produce a reasonable partition scheme and if you are expert
enough to understand that swap partition size and hibernate are
connected. 100% of the beginners I know, would probably not be able to
make that connection.

There's no definitive answer as to what “the recommended setup for beginners” would be.

What for most of them probably would work, is a question if they want to
use hibernate or if they install for a laptop/desktop or a server.
Probably desktop/laptop should be default since the admin of a Debian
server is probably not a beginner anymore either. But this would give an
easy option for him.

Maybe, but that's totally orthogonal to the point I was making.


Cheers,
--
Cyril Brulebois (kibi@debian.org) <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

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Hello,

On 09/07/2023 at 13:18, Rainer Dorsch wrote:

I remember in the early Linux days the recommendation was
swap partition size = 2x RAM size, here

That was when computers did not have enough RAM.

https://wiki.debian.org/de/Hibernate

is says for hibernation, swap should be half the RAM size.

It may be unsufficient. IIUC a hibernation image is limited to half the
RAM size, but extra data still need to be swapped out before creating
the image, and the swap area may already contain swapped data.

For me it is easy to reinstall an create a bigger swap partition. I understand
from the page above another option might be to create a swap file

The described method uses uswsusp which was removed from Debian a long
time ago. Using a swap file with the regular kernel hibernation is not convenient (you must pass the underlying device and file offset for
resume). Not sure this is supported by Debian's initramfs config.

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