22 Apr, 2015
1 commit
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v3: s-o-b comment, explanation of performance and descision for
the start/stop implementationImplementing rmw functionality for RAID6 requires optimized syndrome
calculation. Up to now we can only generate a complete syndrome. The
target P/Q pages are always overwritten. With this patch we provide
a framework for inplace P/Q modification. In the first place simply
fill those functions with NULL values.xor_syndrome() has two additional parameters: start & stop. These
will indicate the first and last page that are changing during a
rmw run. That makes it possible to avoid several unneccessary loops
and speed up calculation. The caller needs to implement the following
logic to make the functions work.1) xor_syndrome(disks, start, stop, ...): "Remove" all data of source
blocks inside P/Q between (and including) start and end.2) modify any block with start
Signed-off-by: NeilBrown
13 Dec, 2012
1 commit
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sse and avx2 stuff only exist on x86 arch, and we don't need to build
altivec on x86. And we can do that at lib/raid6/Makefile.Proposed-by: H. Peter Anvin
Signed-off-by: Yuanhan Liu
Reviewed-by: H. Peter Anvin
Signed-off-by: Jim Kukunas
Signed-off-by: NeilBrown
12 Aug, 2010
1 commit
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Rename raid6/raid6x86.h to raid6/x86.h
and modify some comments.Signed-off-by: NeilBrown
11 Aug, 2010
1 commit
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Linus asks 'why "raid6" twice?'. No reason.
Signed-off-by: David Woodhouse