Re: [RFC PATCH] UBIFS - new flash file system

[Matthieu CASTET <castet.matthieu@free.fr>]

>Artem Bityutskiy <Artem.Bityutskiy <at> nokia.com> writes:
Hi,

thanks for this new file system
> UBIFS is stable and very close to be production ready. It was
> tested on OLPC and N810. The development was done on flash simulator
> on a 2-way x86 machine. However, UBIFS needs a good review.
Did you have a chance of testing it with various real flash : old small page
nand flash, very big large page NAND (4GB), ...



> UBIFS mount time is considerably faster as well. For example,
> In case of OLPC we observed 10-15 seconds faster boot time
> comparing to JFFS2 (fast mount, no full media check).
May be you could update your benchmark :
http://osl.sed.hu/wiki/ubifs/index.php/Mount_results doesn't give super result :
1 second mount time on a 64 MB flash with 517.73 BogoMIPS CPU.
What will be the result for a 4GB flash ? 64 seconds ?

Did you do very intensive and long test where you can see bad block appearing on
the flash ?


Speaking of big nand, is UBI/UBI-FS free of 2GB/4GB limit ?

> UBIFS is quite complex because
Is it possible to create small and fast code for read only support in 
bootloader ?


Matthieu