NAND out of space crash

Deepak Saxena dsaxena at laptop.org
Mon Jul 21 12:51:44 EDT 2008


On Jul 21 2008, at 13:39, C. Scott Ananian was caught saying:
> > 2) JFFS2's behavior when the file system is almost full.  When it gets
> > almost full, it can spend all its time trying to garbage collect, and
> > you can lose completely (the system sort of gets the "slows", and grinds
> > to a halt).
> >
> > As to 2), there are patches done by Nokia (deployed on the N800 and
> > similar devices) that reserve some extra space and report out of space
> > before the system "gets the slows".  These are in Dave's incoming queue
> > to merge into JFFS2 the last I heard.  I don't know if he's merged them.
> 
> These are less critical, IMO.  I have filled up NAND, and "the slows"
> are not debilitating.  The issues above are. We should encourage Dave
> to fix this issue and the other known JFFS2 bugs (trac #6480, for
> instance)  -- or get dsaxena to do so -- for 9.1.

#6480 is fixed as of yesterday, should be in next joyride.

I'll be re-doing Nokia's patches so that they go upstream if we still want
them after 8.2 is out; however, I don't think the approach used by them actually 
helps us.  We already have a very limited amount of storage space and reserving 
space for the root user just reduces what the end user can actually use.

I think analyzing performance of non-JFFS2 file systems and picking
a replacement should be a high-priority item for 9.1 update.

~Deepak

-- 
Deepak Saxena <dsaxena at laptop.org>


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