linux-kernel - Re: [PATCH v2 0/6] Add AVX512 optimized gen_syndrome, xor

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Date:   Mon, 22 Aug 2016 09:38:30 -0700
From:   Shaohua Li <shli@...nel.org>
To:     Gayatri Kammela <gayatri.kammela@...el.com>
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        ravi.v.shankar@...el.com
Subject: Re: [PATCH v2 0/6] Add AVX512 optimized gen_syndrome, xor_syndrome
 and recovery functions

On Fri, Aug 12, 2016 at 06:03:18PM -0700, Gayatri Kammela wrote:
> This is the version 2 patch series for adding AVX512 optimized gen_syndrome,
> xor_syndrome and recovery functions.
> 
> Optimization of RAID6 using AVX512 instructions should improve the
> RAID6 performance.These patches are tested and observed the improvement
> in performance.
> 
> Changes since v1:
> 1) Added xor_syndrome functions to avx512 optimized raid6.
> 
> Gayatri Kammela (6):
>   lib/raid6: Add AVX512 optimized gen_syndrome functions
>   lib/raid6: Add AVX512 optimized recovery functions
>   lib/raid6/test/Makefile: Add avx512 gen_syndrome and recovery
>     functions
>   lib/raid6: Add AVX512 optimized xor_syndrome functions
>   (DO NOT APPLY) lib/raid6: Add unroll by 8 to AVX512 optimized
>     gen_syndrome functions
>   (DO NOT APPLY) lib/raid6: Add unroll by 8 to AVX512 optimized    
>     xor_syndrome functions.
> 
>  arch/x86/Makefile        |   5 +-
>  include/linux/raid/pq.h  |   5 +
>  lib/raid6/Makefile       |   2 +-
>  lib/raid6/algos.c        |  13 +
>  lib/raid6/avx512.c       | 972 +++++++++++++++++++++++++++++++++++++++++++++++
>  lib/raid6/recov_avx512.c | 388 +++++++++++++++++++
>  lib/raid6/test/Makefile  |   5 +-
>  lib/raid6/x86.h          |  10 +
>  8 files changed, 1396 insertions(+), 4 deletions(-)
>  create mode 100644 lib/raid6/avx512.c
>  create mode 100644 lib/raid6/recov_avx512.c
Hi,

I applied the first 4 patches, but I'm not familiar with the new instructions
and nor have the hardware to test them, so only have limited check.

Thanks,
Shaohua