Method to know current kernel is 32bit or 64bit

Hi Dear all,
"uname" can not tell me this working kernel is 32bit or 64bit .
Does anyone has idea to resolve my problem?

isainfo -n

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64bit kernel with 32bit userspace + pacman integration

There have been quite some questions about this topic. Sometimes leading even leading to frustration.
Luckily, a nice writeup was made here with a nice addition to integrate this nicely here.
Since there is no 32bit PAE kernel distributed by ArchLinux, using a 64bit kernel to enable NX is the only option. But since it only has 1G of memory, I do not wish to install a 64bit userspace + 32bit multilib.
However, the *exact* steps have been quite a guess (and there is no wiki). That is why I'm writing this down.
Let's start with the main configuration: pacman.conf
We need to comment out the Architecture stanza. It's funky. Why? Because it actually has two unrelated purposes:
As a documented feature, it provides protection against installing incorrect packages from another architecture
The undocumented feature is the fact that it's literal value is used to replace '$arch' variables in repo URL's
#Architecture = auto
Syncing your local repo's just broke as '$arch' is no longer defined (try it now). I ditched /etc/pacman.d/mirrorlist and did this with my remote repo URL's:
# custom repo for 64bit kernel
[x86_64-kernel]
Server = file:///home/$user/x86_64-kernel/
[core]
Server = http://ftp.nluug.nl/pub/os/Linux/distr/archlinux/core/os/i686
[extra]
Server = http://ftp.nluug.nl/pub/os/Linux/distr/archlinux/extra/os/i686
[community]
Server = http://ftp.nluug.nl/pub/os/Linux/distr/archlinux/community/os/i686
Notice the new custom repo at the top of the file. Adapt your pacman.conf to contain this custom repo as well. Make sure you place it before the [core] repo or whatever other repo is providing your current kernel. The order matters.
Furthermore, I rewrote the configuration file to not depend on variable substitution. One could argue that substituting $repo was unnecessary, but that does not really matter.
Second, we setup the repository as a normal user. This can be done by a regular user in a safe way since the packages are all signed. So tampering with packages will not work. You could even dedicate a cron script with a dedicated user to this purpose (which is overkill).
mkdir /home/$user/x86_64-kernel/
Third, we use a small script to handle this custom repo. We place it at /home/$user/x86_64-kernel.sh . Subsitute the variable R_REPO with your favorite ArchLinux mirror. Make sure this URL points to a 64bit core repository.
#!/bin/bash
set -e
set -o pipefail
L_REPO=/home/$user/x86_64-kernel/
R_REPO=http://ftp.nluug.nl/pub/os/Linux/distr/archlinux/core/os/x86_64/
cd "$L_REPO"
wget -nv "$R_REPO"/core.db -O core.db
DESC=$(tar -tf core.db | grep '^linux-[0-9.-]*/desc$' | tail -n1)
KERNELPKG=$(tar -xf core.db "$DESC" -O | grep -A1 '^%FILENAME%$' | tail -n1)
if ! [[ -f "$KERNELPKG" ]]; then
wget -nv "$R_REPO"/"$KERNELPKG"
wget -nv "$R_REPO"/"$KERNELPKG".sig
repo-add -q x86_64-kernel.db.tar.gz "$KERNELPKG"
fi
Now we are in fact done with the configuration. Substiture $user for your current user in all the sections and do the following:
# create repo, this script also updates it when newer 64bit kernels arrive
user $ bash /home/$user/x86_64-kernel.sh
# update pacman's database
root # pacman -Syy
# install 64bit kernel
root # pacman -S linux
Pacman will be able to update this kernel as long as you run x86_64-kernel.sh every once in a while. I put it in XFCE session startup to run at each session login. You could do this with cron as well.
I tested what hapenned if something went wrong with this repo. Pacman handles this very nicely actually. If you delete the repository, it will complain but not immediatly install the 32bit kernel given you have a 64bit already installed with this repo.
A final note: If you build a lot of packages you could run into trouble. Someone in the forums made a good suggestion about that here -> ("init=linux32 /usr/lib/systemd/..."). This is a nice system-wide way to trick your buildsystem into believing it's a 32bit machine. This is sometimes required. I don't use as I don't have a problem with it. But keep this in mind.
EDIT: Fixed update script to overwrite core.db and not create new ones like core.db.n .
Last edited by Rexilion (2014-02-01 15:41:29)

That is nice. Pity I did not know about this earlier. However, my method allows me to stick with the official packages. Thanks though!

Practical approach to using 64bit kernel and 32bit userspace?

I want to run a 64bit kernel on 32bit userspace. I know there are some out there who claim it's only bad and slowing down the transition to full blown 64bit systems. That may be, but for me and for this particular computer, I need to do this.
I have tried it on my work laptop and there are no problems whatsoever: On my plain vanilla 32bit install I downloaded and installed the current 64bit kernel (after carefully backing up the current one). No problems anywhere, so far.
However, for this other machine, I need to have a sane solution for the long run. What about kernel updates? When a new kernel is released, pacman is going to want to install the 32bit one instead of the 64bit version I want to use. I don't suppose there is a way to "tag" the kernel package to be x86_64 instead of i686, or something to that effect?
I'd be happy to hear your thoughts on this.

hw-tph wrote:
flamelab wrote:put kernel26 in HoldPkg and each time it wants to be updated, install the 64bit one.
According to pacman.conf(5), HoldPkg only seems to have any effect when attempting to remove a package:
pacman.conf(5) wrote:HoldPkg = package ...
If a user tries to --remove a package that's listed in HoldPkg, pacman will ask for confirmation before proceeding.
I'll go with the local repository route.
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I'm happily running a 64bit kernel with 32bit userland, but I was wondering whether there is any way to let pacman allow me to install the 64bit kernel (manually downloaded) without me needing to edit pacman.conf. I sometimes forget to set the arch to i686 again causing me to install 64bit packages.
If there is no such option, I'll script something for myself, but I wanted to be sure I didn't miss something (maybe an undocumented option?).

I have the Architecture line commented out of my pacman.conf, but that is because I am too lazy to upgrade the kernel using --arch. That and I use "i686" in my mirror url and am fairly sure I will never change it to x86_64 by accident...
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ca::ctrlaltdel:/sbin/shutdown -t3 -r now
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#x:5:respawn:/usr/bin/xdm -nodaemon
#x:5:respawn:/usr/sbin/gdm -nodaemon
#x:5:respawn:/usr/bin/kdm -nodaemon
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How could I know my kernel is 32 or 64 bit. I know there is a parameter

Hello
How could I know my kernel is 32 or 64 bit. I know there is a parameter. But which
Thank you in advance

Do you mean that you want to find out programmatically? If not, it should be as easy as checking the properties under "My Computer".
Regards,
RIch Heilman

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pkgname=('nvidia-utils' 'opencl-nvidia')
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And recently we did migrate it to another 64bit linux server.
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https://www.cpubenchmark.net/cpu.php?id=1200

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Thanks for the tip. What I wonder though is should I do that or does the 64-bit client have a 32-bit layer that works with 32-bit applications or, am I forced to still deploy a 32-bit client because of my 32-bit software?
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Method to know current kernel is 32bit or 64bit

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