Messages in this thread | | | Date | Mon, 8 Sep 2008 15:14:40 +0200 | From | Jörn Engel <> | Subject | Re: [PATCH] init: bzip2 or lzma -compressed kernels and initrds |
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On Sun, 7 September 2008 01:17:55 -0500, Rob Landley wrote: > > I vaguely recall that lzma requires more memory to decompress than bzip2 does, > although I don't remember the details. I know that bzip2 takes around 4 megs > (although you need space for the decompressed kernel on _top_ of that, so you > should be able to do it in about 8 megs total). gunzip uses a 64k sliding > window plus dictionary and the whole mess should fit in about 1/4 of a meg.
Less, actually. Iirc gzip takes about 280k for compression and somewhere below 100k for decompression with the kernel runtime zlib. The various copies that unpack kernels at boottime may be worse - they are certainly rather old copies of zlib and haven't seen much maintenance since.
Jörn
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