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sys-kernel/coreos-modules: switch to gzip/zstd compression #1136
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With the default gzip compression the 60 MB limit for the vmlinuz bundle of kernel+initramfs was reached. The limit comes from the size of the /boot partition which is 128 MB large and the kernel needs to fit twice, in addition to GRUB. Use zstd for the initramfs as it provides a similar speed but better compression. For the kernel we can't switch yet to zstd for arm64 but for amd64 it works.
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Looks good.
Side note: I was wondering if we should do the same thing for arm64.
However, apparently arm64 still needs uncompressed Kernel, according to the discussion. https://bugs.gentoo.org/784599
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Thanks for the correction, I assumed it uses GZIP and was confused why switching to something similarly supported didn't work |
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sys-kernel/coreos-modules: switch to gzip/zstd compression
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sys-kernel/coreos-modules: switch to gzip/zstd compression
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Ported to 2905 and 2942 maintenance branches |
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sys-kernel/coreos-modules: switch to gzip/zstd compression
Fixes flatcar/Flatcar#438
How to use/testing done
With zstd for both on amd64 I got a reduction of 13 MB for the vmlinuz file (new size is 49 MB, Alpha 2920.0.0 is 62 MB). Since that didn't work with arm64 I changed arm64 to continue to use no compression (default) for the kernel and zstd for initramfs, this just just a 5 MB reduction (new size is 54 MB, old is 59 MB).
http://jenkins.infra.kinvolk.io:8080/job/os/job/manifest/3138/cldsv/