08 Nov, 2016

1 commit

• b9bf33a8b   lib/raid6: Add AVX2 optimized xor_syndrome functions ... Browse Code »

  Implement the AVX2 optimization of RAID6 xor_syndrome functions which is
  simply based on sse2.c written by hpa.

  Cc: H. Peter Anvin
  Cc: Yuanhan Liu
  Cc: Fenghua Yu
  Signed-off-by: Gayatri Kammela
  Signed-off-by: Shaohua Li

  Gayatri Kammela

  2016-11-08 07:08:20 +0800  

22 Apr, 2015

1 commit

• fe5cbc6e0   md/raid6 algorithms: delta syndrome functions ... Browse Code »

  v3: s-o-b comment, explanation of performance and descision for
  the start/stop implementation

  Implementing 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

  Markus Stockhausen

  2015-04-22 06:00:41 +0800  

13 Dec, 2012

1 commit

• 2c935842b   lib/raid6: Add AVX2 optimized gen_syndrome functions ... Browse Code »

  Add AVX2 optimized gen_syndrom functions, which is simply based on
  sse2.c written by hpa.

  Signed-off-by: Yuanhan Liu
  Reviewed-by: H. Peter Anvin
  Signed-off-by: Jim Kukunas
  Signed-off-by: NeilBrown

  Yuanhan Liu

  2012-12-13 16:51:03 +0800