Re: Reiser4 und LZO compression

[Edward Shishkin <edward@namesys.com>]

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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