Re: [Ext2-devel] Re: [RFC] extents support for EXT3

[Pavel Machek]

Hi!

> > > you get no real slowdown as far as rough benchmarks are concerned, 
> > > perhaps with a microbenchmark you would see one and also, doesn't it 
> > > take up more space to save the extent info and such? Either way, all of 
> > > it's real benefits occur on large files.
> > 
> > IIRC, if your blocks are contiguous, you can save as soon as soon as the
> > file size goes above one block (witout extents, the first 12 blocks are
> > pointed to by what?  I forget... :-/ )
> 
> They are pointed to directly from the inode.
> 
> In light of other concerns how reasonable is a switch to e2fsck that
> will remove extents so people can downgrade filesystems?

It is going to be non-trivial: downgrading filesystem will likely need
free space. And now: what happens when there's no free space?

								Pavel
-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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