Re: Reiser4 und LZO compression

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Nigel Cunningham wrote:
Hi.

On Mon, 2006-08-28 at 22:15 +0400, Edward Shishkin wrote:

Stefan Traby wrote:

On Mon, Aug 28, 2006 at 10:06:46AM -0700, Hans Reiser wrote:



Hmm.  LZO is the best compression algorithm for the task as measured by
the objectives of good compression effectiveness while still having very
low CPU usage (the best of those written and GPL'd, there is a slightly
better one which is proprietary and uses more CPU, LZRW if I remember
right.  The gzip code base uses too much CPU, though I think Edward made


I don't think that LZO beats LZF in both speed and compression ratio.

LZF is also available under GPL (dual-licensed BSD) and was choosen in favor
of LZO for the next generation suspend-to-disk code of the Linux kernel.

see: http://www.goof.com/pcg/marc/liblzf.html


thanks for the info, we will compare them


For Suspend2, we ended up converting the LZF support to a cryptoapi
plugin. Is there any chance that you could use cryptoapi modules? We
could then have a hope of sharing the support.


No problems with using crypto-api. Reiser4 bypasses it, because
currently it supplies the only compression level, which is fairly
bad for compressed file systems.

Edward.

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