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authorDave Chinner <dchinner@redhat.com>2013-11-22 10:41:16 +1100
committerBen Myers <bpm@sgi.com>2013-12-17 09:17:25 -0600
commit6e708bcf6583f663da9fe7bc5292cc62f0a8410d (patch)
tree01b3babf84f6c7317f115e4a97ff8188cf38fda6 /scripts/rt-tester
parent809625ca544bdc9e02a5728c1939a76dc29decb1 (diff)
xfs: align initial file allocations correctly
The function xfs_bmap_isaeof() is used to indicate that an allocation is occurring at or past the end of file, and as such should be aligned to the underlying storage geometry if possible. Commit 27a3f8f ("xfs: introduce xfs_bmap_last_extent") changed the behaviour of this function for empty files - it turned off allocation alignment for this case accidentally. Hence large initial allocations from direct IO are not getting correctly aligned to the underlying geometry, and that is cause write performance to drop in alignment sensitive configurations. Fix it by considering allocation into empty files as requiring aligned allocation again. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ben Myers <bpm@sgi.com> (cherry picked from commit f9b395a8ef8f34d19cae2cde361e19c96e097fad)
Diffstat (limited to 'scripts/rt-tester')
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