New version of e2compr for 2.4.16 kernel.

New version of e2compr for 2.4.16 kernel.

[Denis RICHARD]

Hi,

  We have developped a new version of the e2compr package for the 2.4.16 kernel.
It is based on the e2compr-0.4.39 patch provided by Peter Moulder
for 2.2.18 kernel (http://cvs.bofh.asn.au/e2compr/).
  It is full compatible with previous version.

  We have introduced the structure of "cluster of pages", as there was the structure
of "cluster of blocks" in preceding version. The compression unit is the cluster of
pages.

  The implementation is similar with the 2.2 version. If the page needed is not present
in memory, the cluster of pages including this one is decompressed.
  But in the 2.4 kernel the pages and the blocks have common area for the data.
If a block is read from the device, the corresponding page is also modified.
Then to decompress a cluster we should not read the blocks in the already used pages (decompressed)
of the cluster. These pages can have been modified or can be used by another process (mapping).
If a page is UPTODATE, a new one is allocated to decompress the cluster, and is freed after that.

  It has only been tested on i386 architecture, so be careful if you want to try it
on other architecture, and especially if pages are large and can belong to two different
clusters.

  For more informations, see the README files in Documentation/filesystems directory.

  If someone is interested by the patch, we will mail it.

  Feel free to contat us if you have some questions.

  Have fun.

 Pierre PEIFFER, Denis RICHARD .

PS : We have also adjusted the e2fsprogs patch for the last version (1.25).

--
-----------------------------\--------------------------\
Denis RICHARD                 \ ALCATEL Business Systems \
mailto:dri@sxb.bsf.alcatel.fr / Tel: +33(0)3 90 67 69 36 /
-----------------------------/--------------------------/

Re: New version of e2compr for 2.4.16 kernel.

[Jelle Foks]

Denis RICHARD wrote:

>Hi,
>
>  We have developped a new version of the e2compr package for the 2.4.16 kernel.
>

Nice. Since ext3fs is based on ext2fs, will that work with ext3fs too?

cya,

Jelle.

>
>It is based on the e2compr-0.4.39 patch provided by Peter Moulder
>for 2.2.18 kernel (http://cvs.bofh.asn.au/e2compr/).
>  It is full compatible with previous version.
>
>  We have introduced the structure of "cluster of pages", as there was the structure
>of "cluster of blocks" in preceding version. The compression unit is the cluster of
>pages.
>
>  The implementation is similar with the 2.2 version. If the page needed is not present
>in memory, the cluster of pages including this one is decompressed.
>  But in the 2.4 kernel the pages and the blocks have common area for the data.
>If a block is read from the device, the corresponding page is also modified.
>Then to decompress a cluster we should not read the blocks in the already used pages (decompressed)
>of the cluster. These pages can have been modified or can be used by another process (mapping).
>If a page is UPTODATE, a new one is allocated to decompress the cluster, and is freed after that.
>
>  It has only been tested on i386 architecture, so be careful if you want to try it
>on other architecture, and especially if pages are large and can belong to two different
>clusters.
>
>  For more informations, see the README files in Documentation/filesystems directory.
>
>  If someone is interested by the patch, we will mail it.
>
>  Feel free to contat us if you have some questions.
>
>  Have fun.
>
> Pierre PEIFFER, Denis RICHARD .
>
>PS : We have also adjusted the e2fsprogs patch for the last version (1.25).
>
>--
>-----------------------------\--------------------------\
>Denis RICHARD                 \ ALCATEL Business Systems \
>mailto:dri@sxb.bsf.alcatel.fr / Tel: +33(0)3 90 67 69 36 /
>-----------------------------/--------------------------/
>
>
>
>-
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Re: New version of e2compr for 2.4.16 kernel.

[Stephen C. Tweedie]

Hi,

On Thu, Dec 20, 2001 at 05:25:07PM -0500, Jelle Foks wrote:

> Nice. Since ext3fs is based on ext2fs, will that work with ext3fs too?

Not directly, but it should not be that hard to make it work.

Cheers,
 Stephen

Re: New version of e2compr for 2.4.16 kernel....

[Padraig Brady]

http://www.alizt.com/

Re: New version of e2compr for 2.4.16 kernel....

[François Boisson]

Le Thu, 02 Jan 2003 15:09:35 +0000
Padraig Brady <padraig.brady@corvil.com> a dit:

> http://www.alizt.com/
> 

Thanks for the answers, for William Stearns
http://cvs.bofh.asn.au/e2compr/ does not answer.
I do the patch. It seems to work but there is some problems with noflushd
(freeze during sync I think).

Thanks a lot
François Boisson