Ext3 File System: Dynamic Reorganization

[Chan Chung Hang Christopher]

Knapp wrote:
> On Fri, Feb 19, 2010 at 8:28 AM, Nils Kassube <kassube at gmx.net> wrote:
>> MirJafar Ali wrote:
>>> I am wondering why this is not implemented and available, when there
>>>  are so many articles written in late 90's showing great performance
>>>  improvements.
>> If you want to know _why_ something is / isn't implemented for a
>> particular file system, you may get better answers if you ask those
>> implementing the file system. For ext2/3/4 they are usually found on
>> LKML [1] and not on a user support list for a distribution which merely
>> uses that FS.
>>
>>
>> Nils
> 
> Sadly, I think that you are correct but I would love to hear the answer!
> 
> 

For ext3, it is in the way allocation is done (put everything in the 
same general location) and for ext4, they take it further with delayed 
allocation. Fragmentation rarely occurs and where it does, it is 
specific to the use case of that particular computer.