Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3

[Jeff Garzik]

Theodore Tso wrote:
> Jeff, you seem to think that the fact that the layout isn't precisely
> the same after an on-line resizing is proof of something horrible, but
> it isn't.  The exact location of filesystem metadata has never been
> fixed, not in the past ten years of ext2/3 history, and this is not a
> big deal.  It certainly isn't "proof" of on-line resizing being
> something horrible, as you keep trying to claim, without any arguments
> other than, "The layout is different!".  

No, I was proving merely that it is _different_.  And the values where 
you see a _difference_ are the ones of which are no longer sized 
optimally, after you grow the fs to a larger size.

So you incur a performance penalty for resizing to size S2, rather than 
mke2fs'ing the new blkdev at size S2.  Certainly within the confines of 
ext3 that cannot be helped, but a different inode allocation strategy 
could improve upon that.

	Jeff


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