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Re: jffs2 fragmentation
On Sat, 2003-10-18 at 09:20 -0500, J B wrote:
> Normally, a rm/cp pair takes about 2 minutes on my system. After about 10
> iterations, the copies begin to take longer, about 3-4 minutes. After
> about 10 iterations they take upwards of 1/2 an hour.
I suspect you've triggered the worst case of a performance bug which
I've known about for a while.
We should write new data out to one empty block, while writing out
garbage-collected data out to another. We don't do that at the moment;
we interleave old and new data and then you erase your new file, leaving
us with a very suboptimal mix of valid and obsolete nodes in each
eraseblock we've been writing to.
I'm still a bit surprised it takes half an hour though.
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