UBI Used In Commercial Products ??

Sergei Sharonov sergei.sharonov at halliburton.com
Wed Oct 31 19:01:07 EDT 2007

> JFFS2 has been modified to sit on top of UBI.

Yes, I know. Is that better then JFFS2 on top of mtdblock device?
> One thought here is that I would think that mounting is a fairly rare
> occurance.  
> You're much more likely to coming back from suspend.  Notice the
> difference in time it takes from my HP iPAQ to power-on normally vs a
> cold boot.  It is very different. 

Still one must plan for the worst case and the worst case for me
was about 2 hours of mount time after I used ftp to transfer large file.
I suspect ftp was writing really small jffs2 nodes.
Disclaimer: that was about 2 years ago and jffs2 might have improved,
processor (ARM9) was not a speed demon either.
If you do that on your iPAQ (create large file with lots of small nodes)
and then cold boot it - would you be willing to wait for an hour for it to 
become usable again?

I really hope UBI+UBIFS will overcome this problem. Still there is a concern 
here since UBI scales linearly. Can somebody plz post UBI scan time for large
flash array?


Sergei Sharonov

More information about the linux-mtd mailing list