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kernel-compression [2022/12/19 02:17] – snacsnockernel-compression [2022/12/19 05:03] – [rootfs compression: xz vs gzip] snacsnoc
Line 1: Line 1:
-Kernel compression methods:+Kernel compression methods and comparisons:
 GZIP, bzip2, LZMA, XZ, LZO,LZ4,ZSTD GZIP, bzip2, LZMA, XZ, LZO,LZ4,ZSTD
  
  
 +====== Size ======
  
   ls -s bzImage    ls -s bzImage 
Line 10: Line 11:
   5988 arch/x86/boot/bzImage   5988 arch/x86/boot/bzImage
 LZMA: 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