> My estimate is that a btree/extents based structure will pay for itself
> only if the average extent for large files is more than 12 blocks.
It usually is far above that, but if we want to be sure,
we could increase the preallocation to 16 or even 32
blocks... (maybe sysctl tunable, or as a mount option)
Only sparse files will be relatively expensive, but still
less expensive than today...
Rik.
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