Re: Is it good for a PDA fs?

[Hans Reiser <reiser@namesys.com>]

Oleg Drokin wrote:

>Hello!
>
>On Sun, Jun 23, 2002 at 11:18:02AM +0400, Hans Reiser wrote:
>
>  
>
>>>>I think I probably care more about downloading and trying the latest 
>>>>kalendar than installing a new kernel on it.;-)   It is nice to have ssh 
>>>>        
>>>>
>>>Yes, exactly. I do not see how you (or any other user) would benefit from
>>>using anything but vfat in CF, but disadvantages are pretty clear.
>>>      
>>>
>>Space would be saved if the journal was shrunk in size....
>>    
>>
>
>VFAT (fat32) addresses 512 byte blocks while reiserfs now addresses
>4096 byte blocks. (not this can be theoretically decreased to 1024 byte blocks
>with a patch, but in this case tree will grow very quickly and will reach
>height of 5 way too soon). And while on reiserfs tails are not packed
>for files over 16K (and not packed for smaller files in some cases to to avoid
>"seeks"), it is impossible to spend more than 511 bytes of unused space
>on vfat no matter what file size is. (vs max of 4095 bytes wasted on
>reiserfs in unlucky case).
>So right now I do not see noticeable space savings.
>
End of file space wastage is critical for small files not large ones. 
 For small files we do much better than VFAT.

I don't know what overhead they have for various kinds of metadata 
though.....

It is probably true that VFAT does a better job for CF than for usual 
hard drives though.

>Of course I have not performed precise measurements so this is only
>a theory.
>
>Bye,
>    Oleg
>
>
>  
>


-- 
Hans