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kernel-compression [2022/12/19 02:50] – 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: ======
  
  
Line 21: Line 25:
   7852 rootfs.gz   7852 rootfs.gz
      
-rootfs compression: xz vs gzip 
  
-  [easto@cupcake][~/snacklinux]$ make TARGET=i486 iso +====== Speed: ======
-  cd /opt/snacklinux_rootfs/; find . -print | cpio -o -H newc --quiet | xz > /home/easto/snacklinux/rootfs.xz +
-  wait +
-  mv rootfs.xz boot/isolinux +
-  /usr/bin/genisoimage -l -J -R -input-charset utf-8 -b isolinux/isolinux.bin -c isolinux/boot.cat  -no-emul-boot -boot-load-size 4 -boot-info-table -o   iso/snacklinux_i486_`date +'%d.%m.%y'`.iso boot +
-  Size of boot image is 4 sectors -> No emulation +
-   92.50% done, estimate finish Mon Dec 19 02:44:43 2022 +
-  Total translation table size: 2048 +
-  Total rockridge attributes bytes: 954 +
-  Total directory bytes: 2408 +
-  Path table size(bytes): 26 +
-  Max brk space used 0 +
-  5414 extents written (10 MB)  +
  
-gzip 
-[easto@cupcake][~/snacklinux]$ make TARGET=i486 iso 
-cd /opt/snacklinux_rootfs/; find . -print | cpio -o -H newc --quiet | gzip > /home/easto/snacklinux/rootfs.gz 
-wait 
-mv rootfs.gz boot/isolinux 
-/usr/bin/genisoimage -l -J -R -input-charset utf-8 -b isolinux/isolinux.bin -c isolinux/boot.cat  -no-emul-boot -boot-load-size 4 -boot-info-table -o iso/snacklinux_i486_`date +'%d.%m.%y'`.iso boot 
-Size of boot image is 4 sectors -> No emulation 
- 86.54% done, estimate finish Mon Dec 19 02:47:41 2022 
-Total translation table size: 2048 
-Total rockridge attributes bytes: 954 
-Total directory bytes: 2408 
-Path table size(bytes): 26 
-Max brk space used 0 
-5787 extents written (11 MB) 
  
-Speed: +  [easto@cupcake][~/snacklinux]$ cd /opt/snacklinux_rootfs/; time find . -print | cpio -o -H newc --quiet | gzip > /home/easto/snacklinux/rootfs.gz 
- +   
-[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
  
-real    0m0.661s +  [easto@cupcake][/opt/snacklinux_rootfs]$ cd /opt/snacklinux_rootfs/; time find . -print | cpio -o -H newc --quiet | xz > /home/easto/snacklinux/rootfs.xz 
-user    0m0.607s +   
-sys     0m0.052s +  real    0m4.697s 
- +  user    0m4.521s 
-[easto@cupcake][/opt/snacklinux_rootfs]$ cd /opt/snacklinux_rootfs/; time find . -print | cpio -o -H newc --quiet | xz > /home/easto/snacklinux/rootfs.xz +  sys     0m0.162s
- +
-real    0m4.697s +
-user    0m4.521s +
-sys     0m0.162s+