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authorDan Williams <dan.j.williams@intel.com>2010-05-04 20:41:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-05 07:52:56 -0700
commit5157b4aa5b7de8787b6318e61bcc285031bb9088 (patch)
treecf47d7739d646895a151bf3fd71e56e64dc9d260 /Documentation/input
parent7ebd467551ed6ae200d7835a84bbda0dcadaa511 (diff)
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raid6: fix recovery performance regression
The raid6 recovery code should immediately drop back to the optimized synchronous path when a p+q dma resource is not available. Otherwise we run the non-optimized/multi-pass async code in sync mode. Verified with raid6test (NDISKS=255) Applies to kernels >= 2.6.32. Cc: <stable@kernel.org> Acked-by: NeilBrown <neilb@suse.de> Reported-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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