JFFS2: Difference between revisions
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I'd like to see some more info on JFFS2, the compression algorithm (or algorithms) that will be used, and ideally, some data on how well various files might be expected to compress with examples. Some photos, diagrams, xml, python code, etc. |
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Jffs2 also has a garbage collection algorithm that eliminates unnecessary I/O. |
Jffs2 also has a garbage collection algorithm that eliminates unnecessary I/O. |
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== Algoritms == |
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== Algorithms == |
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=== Zlib === |
=== Zlib === |
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=== rtime === |
=== rtime === |
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This is a simple algorithm that often manages to squeeze |
This is a simple algorithm that often manages to squeeze extra few |
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bytes from data already compressed with gzip |
bytes from data already compressed with gzip |
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== Links == |
== Links == |
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*[http://en.wikipedia.org/wiki/JFFS2 JFFS2] at |
*[http://en.wikipedia.org/wiki/JFFS2 JFFS2] at Wikipedia |
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*[http://en.wikipedia.org/wiki/JFFS JFFS] at |
*[http://en.wikipedia.org/wiki/JFFS JFFS] at Wikipedia |
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*[http://sourceware.org/jffs2/jffs2-html/ Summary on JFFS] |
*[http://sourceware.org/jffs2/jffs2-html/ Summary on JFFS] |
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*[http://developer.axis.com/software/jffs/ Homepage of JFFS at AXIS] |
*[http://developer.axis.com/software/jffs/ Homepage of JFFS at AXIS] |
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Revision as of 05:09, 15 January 2007
JFFS2 is the Journaling Flash File System version 2, jffs2 is a log-structured file system for flash memory devices and has support for NAND devices, also Hard links and compression algorithms like zlib, rubin, and rtime.
Jffs2 also has a garbage collection algorithm that eliminates unnecessary I/O.
This article is a stub. You can help the OLPC project by expanding it.
Algorithms
Zlib
Lossless data-compression library,
rubin
This simple algorithm is faster than zlib but not quite as effective.
rtime
This is a simple algorithm that often manages to squeeze extra few bytes from data already compressed with gzip
Links
- JFFS2 at Wikipedia
- JFFS at Wikipedia
- Summary on JFFS
- Homepage of JFFS at AXIS