sys-kernel/coreos-kernel: Decompress the minimal initrd kernel modules #3437
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krnowak
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Oct 29, 2025
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Hmm, doesn't actually work yet. modules.dep needs to be regenerated. |
pothos
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Oct 29, 2025
...ntainer/src/third_party/coreos-overlay/sys-kernel/coreos-kernel/coreos-kernel-6.12.54.ebuild
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The initrd itself is already compressed with xz, so compressing the modules within with xz as well just makes the image bigger and slower. Not compressing all the kernel modules in the first place is not such a clear win because it is zlib and zstd compression that is applied elsewhere. Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>
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All green now. Also the modules.* files now only cover the modules that are actually in the initrd, so those have shrunk a bit too! |
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Build action triggered: https://github.com/flatcar/scripts/actions/runs/18937364880 |
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Decompress the minimal initrd kernel modules
The initrd itself is already compressed with xz, so compressing the modules within with xz as well just makes the image bigger and slower. I observed a 512KB vmlinuz reduction.
Not compressing all the kernel modules in the first place is not such a clear win because it is zlib and zstd compression that is applied elsewhere.
How to use
Just see whether it boots and check the size changes.
Testing done
I've done a local build to check the size difference. I'll run GHA now.
changelog/directory (user-facing change, bug fix, security fix, update) -- N/A/bootand/usrsize, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.