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Multi-threaded concurrent direct IO is slower on EXT filesystems versus raw block devices

Solution Verified - Updated 2011-05-26T20:46:59+00:00 -

Issue

Multi-threaded IO utilizing O_DIRECT is slower on EXT2, EXT3, and EXT4 than it is on a block device
An example workload such as a restore from a Sybase backup where Sybase is configured to use direct IO is much slower when using an EXT filesystem versus a raw block device
The speed difference is as much as 200% slower on a filesystem versus raw block device

Environment

Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
EXT2
EXT3
EXT4
Multi-threaded concurrent direct IO

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