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Fulgurance
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Joined: 15 Feb 2017
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 Posted: Mon Nov 23, 2020 9:28 am Post subject: Question about kernel |
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| Hello, today I have question, what is the difference between gentoo-sources and gentoo-kernel?I don't found any documentation about that. |
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mrbassie
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Joined: 31 May 2013
Posts: 833
Location: Go past the sign for cope, right at the sign for seethe. If you see the target you've missed it.
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| Posted: Mon Nov 23, 2020 9:45 am Post subject: |
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| Gentoo-kernel is a binary. |
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Ionen
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Joined: 06 Dec 2018
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| Posted: Mon Nov 23, 2020 9:50 am Post subject: |
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gentoo-sources install the sources for you to build/manage yourself, or with other tools (the common/traditional way to do this on gentoo, giving you the most freedom to fit any setups)
gentoo-kernel has portage actually build the kernel which is newer (will still install a trimmed down ~80MB source at /usr/src only enough to build 3rd party modules and run things like menuconfig). Like `make install` the kernel is still installed through /sbin/installkernel by default so it'll also run /etc/kernel/postinst.d scripts allowing you to automate the entire process through normal @world updates if wanted.
By default gentoo-kernel uses a generic configuration taken from fedora, but you can USE=savedconfig to use your own.
| mrbassie wrote: | | Gentoo-kernel is a binary. |
It's not, gentoo-kernel-bin is.
Last edited by Ionen on Mon Nov 23, 2020 9:53 am; edited 1 time in total |
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Fulgurance
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| Posted: Mon Nov 23, 2020 9:52 am Post subject: |
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| Finally, you can have your personal config like gentoo-sources with automated update and build process? |
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Ionen
Developer
Joined: 06 Dec 2018
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| Posted: Mon Nov 23, 2020 9:54 am Post subject: |
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| Fulgurance wrote: | | Finally, you can have your personal config like gentoo-sources with automated update and build process? |
Yep. It does have some limitations (e.g. can't trigger @module-rebuild by itself) but I've happily moved to it myself.
Edit: and before someone asks, it auto-runs `make olddefconfig` on your .config, at most may want to revise your config on major versions changes only |
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Fulgurance
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| Posted: Mon Nov 23, 2020 3:35 pm Post subject: |
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| Oh it's better! |
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Fulgurance
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| Posted: Tue Nov 24, 2020 6:44 pm Post subject: |
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And I have just 2 questions, if I want to now use gentoo-kernel, I just need to emerge it with saved config, update grub and its fine?
My second question :this kernel have experimental feature like gentoo-sources? (I use this to enable optimisation for specific processor) |
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Ionen
Developer
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| Posted: Tue Nov 24, 2020 7:20 pm Post subject: |
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| Fulgurance wrote: | | if I want to now use gentoo-kernel, I just need to emerge it with saved config, update grub and its fine? |
Yes.
If you want it 100% automated (e.g. grub included), and using installkernel-gentoo (default), then you can set this up with a script in /etc/kernel/postinst.d/ that will be run during pkg_postinst() by gentoo-kernel.
For my EFI stub kernel personally I have a /etc/kernel/postinst.d/efi-install which puts the kernel in /boot/efi (after remounting read-write), setup backup efi boot for running kernel, and cleanup old kernels. For grub I guess you'd just have to do the usual grub-mkconfig
| Quote: | | My second question :this kernel have experimental feature like gentoo-sources? (I use this to enable optimisation for specific processor) |
No, if you _really_ want it then (until bug #706294 is resolved) you'll have to put it in /etc/portage/patches and keep it updated.
Considering the kernel already goes out of its way to disable instructions -march= enables (like -mno-avx, most likely for a reason), I personally feel this whole idea isn't great nor worth it. |
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Zucca
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Joined: 14 Jun 2007
Posts: 3935
Location: Rasi, Finland
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| Posted: Tue Nov 24, 2020 9:18 pm Post subject: |
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| mrbassie wrote: | | Gentoo-kernel is a binary. |
No. gentoo-kernel-bin is a binary.
gentoo-kernel in the other hand is a kernel with a pre made config file and it uses dracut to create a initramfs.
_________________
..: Zucca :..
| My gentoo installs: | init=/sbin/openrc-init
-systemd -logind -elogind seatd |
| Quote: | | I am NaN! I am a man! |
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mrbassie
l33t
Joined: 31 May 2013
Posts: 833
Location: Go past the sign for cope, right at the sign for seethe. If you see the target you've missed it.
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| Posted: Wed Nov 25, 2020 8:29 am Post subject: |
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| I stand corrected. |
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Kernel & Hardware
