writing to jffs2 is so slow?
dwmw2 at infradead.org
Fri Sep 6 14:54:15 EDT 2002
xjin at redswitch.com said:
> > Try eraseall from the utils.
> > With that, jffs2 just writes the erase markers to flash, 12 bytes per
> > erase block.
No, JFFS2 cannot trust that 'empty' blocks really have been properly
erased, and must erase them again, writing a 'cleanmarker' node to them
when the erase is complete.
> Well, that's just what I did. Then making a first directory takes 2
JFFS2 is busy erasing every block on the file system. You have to wait
until it's done before you can write.
Hacking the 'eraseall' program so it writes a 'cleanmarker' node to the
beginning of every block erased is left as an exercise for the reader.
Other possibilities include a mount time option to tell JFFS2 that it
should trust the flash and not re-erase the blocks, and/or changing the
jffs2_write_super()/jffs2_erase_pending_blocks() to only erase a few blocks
at a time, so you only have to wait for a few blocks to be erased, not the
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