[RFC, PATCH 0/2] xfs: dynamic speculative preallocation for delalloc

[Ivan.Novick at emc.com]

>> The reported numbers were a drop in read throughput of ~15% on a
>> GB/s class filesystem when the files interleaved.
I have seen ~50% performance improvement in read rate when changing from small extents to large extents with XFS. Essentially going from not using allocsize to setting 1gb allocsize.  Also GB/s class filesystem.

Cheers,
Ivan Novick