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Kernel compression methods and comparisons: GZIP, bzip2, LZMA, XZ, LZO,LZ4,ZSTD
Size
ls -s bzImage
XZ:
4276 bzImage
LZO:
5988 arch/x86/boot/bzImage
LZMA:
4584 arch/x86/boot/bzImage
Compressing root build directory:
[easto@cupcake][/opt/snacklinux_rootfs]$ find . -print | cpio -o -H newc --quiet | gzip -9 > rootfs.gz cpio: File ./rootfs.gz grew, 1048576 new bytes not copied [easto@cupcake][/opt/snacklinux_rootfs]$ ls -s rootfs.gz 7812 rootfs.gz [easto@cupcake][/opt/snacklinux_rootfs]$ find . -print | cpio -o -H newc --quiet | gzip > rootfs.gz cpio: File ./rootfs.gz grew, 1064960 new bytes not copied [easto@cupcake][/opt/snacklinux_rootfs]$ ls -s rootfs.gz 7852 rootfs.gz
Speed:
[easto@cupcake][~/snacklinux]$ cd /opt/snacklinux_rootfs/; time find . -print | cpio -o -H newc --quiet | gzip > /home/easto/snacklinux/rootfs.gz real 0m0.661s user 0m0.607s sys 0m0.052s
[easto@cupcake][/opt/snacklinux_rootfs]$ cd /opt/snacklinux_rootfs/; time find . -print | cpio -o -H newc --quiet | xz > /home/easto/snacklinux/rootfs.xz real 0m4.697s user 0m4.521s sys 0m0.162s