Debugging performance issues 15
to avoid this issue. For more information, see the patch
(http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=b90f687018e6d6 ) and
bug report (https://bugzilla.kernel.org/show_bug.cgi?id=15579).
The fix is included in RHEL6 pre-release kernel kernel-2.6.32-23.el6. The eventual release RHEL6 kernel is not
affected by this issue.
Discard support was added to the kernel.org mainline ext4 in Version 2.6.28 and was enabled by default.
For fear of damaging some devices, discard was set to default to disabled in Version 2.6.33-rc1 and was
back ported to 2.6.31.8 and 2.6.32.1. For more information, see the kernel patch
(http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=5328e635315734d).
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