[U-Boot-Users] bzip2 very slow
Aras Vaichas
arasv at magellan-technology.com
Fri Apr 8 05:34:18 CEST 2005
I recently started using bzip2 to compress my kernel, I made the necessary
changes in u-boot-1.1.2 to include bzip2 and increase the malloc size to 4MB.
The decompression for the bzip2 image is over 10 times slower compared to the
gzip image.
version: U-Boot-1.1.2 - 5338372 Feb 25 10:47 u-boot-1.1.2.tar.bz2
cpu: at91rm9200
from at91rm9200dk.h:
#define CONFIG_BZIP2 1
#define CFG_MALLOC_LEN (0x410000)
Here is a comparison of gzip vs bzip2 on the same 2.6.x kernel:
== gzip ==
$ gzip -v9 linux.bin
$ /usr/local/uboot/mkimage -A arm -O linux -C gzip -a 0x20008000 -e 0x20008000
-d linux.bin.gz uImage-2.6-dk
compressed file size: 877kB
decompression time: about 3 seconds
== bzip2 ==
$ bzip2 --best linux.bin
$ /usr/local/uboot/mkimage -A arm -O linux -C bzip2 -a 0x20008000 -e 0x20008000
-d linux.bin.bz2 uImage-2.6-dk
compressed file size: 813kB
decompression time: about 30 seconds
bzip2 is taking over 10 times longer to decompress for a 64K smaller file size.
Is this normal?
regards,
Aras Vaichas
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