[ECOS] FW: Mount JFFS2 root file system issue

[Jürgen Lambrecht]

Hello Chris,

We would be interested in eCosCentric's JFFS2 if - in order of importance
- it would need less RAM per file
- it would have less "strange" problems
  * if I drive JFFS2 to its limits (put it full, use very big files, put 
many small files in 1 directory) it can get corrupted
  * our simple FTP server corrupts JFFS2 if you put over 180 files with 
a FTP client on PC
  * the more you use JFFS2 (add and remove files), the more it trashes 
itself, so the more delay all actions have
- it would be faster in opening files (especially in a directory with 
over 1000 files)

Therefore, I want to repeat the warning from Thomas Köller: "Do not use 
large JFFS2 file systems if RAM is a scarce resource!" 
(http://sourceware.org/ml/ecos-discuss/2003-10/msg00247.html).
And that is just what we have done..

Kind regards,
Jürgen

Chris Zimman wrote:

>>I am also struggling with JFFS2, and I did already a lot of tests.
>>There more files you have in jffs2, the longer it takes to mount:
>>- per inode, 16 B (static) or 24 B (dynamic) are written in RAM
>>- per file, more or less 72 B (found by testing, I should check the
>>jffs2 sources..) are written in RAM
>>Also, during mounting, a garbage collect is done. As explained below,
>>the file system (the journal) is then checked. And the bigger the
>>flash,
>>the more time it can take.
>>
>>Indeed, once the boot time is long, you can only solve it by formatting
>>jffs2.
>>
>>I can reproduce this this way: I put 1000 files in 1 directory, then I
>>delete 997 of them, and still mounting and also opening of 1 file takes
>>very long. To go more in detail: mounting goes from 11s to 10s, but
>>opening 1 file goes from 570ms to 820ms.
>>    
>>
>
>Just so you're aware, eCosCentric does provide a supported and working
>version of JFFS2 with eCosPro.
>
>--Chris
>
>
>  
>

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