If have more info about it :

http://lwn.net/Articles/9632/

problem resides in kernel 2.4.20-xfs (present on knoppix 06/06/2003)

should be solved with development kernel 2.5.36 (or 37) ,where they inserted some patches.
I quote :
'Kernel release status
The current development kernel is 2.5.36, which was released by Linus on September 17. The big news was, of course, is the merge of the XFS journaling filesystem. There's also the x86 "huge page" patch, an IEEE-1394 ("Firewire") update, a big USB update (converting the code to the new driver model scheme), an IDE update, and various other fixes. See the long-format changelog for the details.'

If anybody has a remastered knoppix with this development kernel 2.5.36 ,can you contact me ? thanks in advance...[/i]