linux-kernel - Re: Reiser4 und LZO compression

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Date:	Tue, 29 Aug 2006 13:29:47 +0400
From:	Edward Shishkin <edward@...esys.com>
To:	Nigel Cunningham <ncunningham@...uxmail.org>
CC:	Stefan Traby <stefan@...lo-penguin.com>,
	Hans Reiser <reiser@...esys.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	reiserfs-list@...esys.com, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>
Subject: Re: Reiser4 und LZO compression

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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