From mboxrd@z Thu Jan  1 00:00:00 1970
From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
Date: Thu, 25 Jun 2015 10:50:56 +0200
Subject: [PATCH] md/raid6: delta syndrome for ARM NEON
In-Reply-To: <CAKv+Gu9aTCyEQi9g_7oBzOBYay5H_z2mUxK4_D7CQjGs40Lwpw@mail.gmail.com>
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 <12EF8D94C6F8734FB2FF37B9FBEDD1735FCC7052@EXCHANGE.collogia.de>
 <CAKv+Gu9aTCyEQi9g_7oBzOBYay5H_z2mUxK4_D7CQjGs40Lwpw@mail.gmail.com>
Message-ID: <CAKv+Gu-6h4ARtX-ecTeuhxeL+uRYfrs+avfai60rPyMtTthnzQ@mail.gmail.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 25 June 2015 at 10:30, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
> On 25 June 2015 at 08:32, Markus Stockhausen <stockhausen@collogia.de> wrote:
>>> Von: Ard Biesheuvel [ard.biesheuvel at linaro.org]
>>> Gesendet: Mittwoch, 24. Juni 2015 18:43
>>> An: linux-arm-kernel at lists.infradead.org; hpa at zytor.com
>>> Cc: Ard Biesheuvel; Markus Stockhausen; Neil Brown
>>> Betreff: [PATCH] md/raid6: delta syndrome for ARM NEON
>>>
>>> This implements XOR syndrome calculation using NEON intrinsics.
>>> As before, the module can be built for ARM and arm64 from the
>>> same source.
>>
>>> Relative performance on a Cortex-A57 based system:
>>>
>>>   raid6: int64x1  gen()   905 MB/s
>>>   raid6: int64x1  xor()   881 MB/s
>>>   raid6: int64x2  gen()  1343 MB/s
>>>   raid6: int64x2  xor()  1286 MB/s
>>>   raid6: int64x4  gen()  1896 MB/s
>>>   raid6: int64x4  xor()  1321 MB/s
>>>   raid6: int64x8  gen()  1773 MB/s
>>>   raid6: int64x8  xor()  1165 MB/s
>>>   raid6: neonx1   gen()  1834 MB/s
>>>   raid6: neonx1   xor()  1278 MB/s
>>>   raid6: neonx2   gen()  2528 MB/s
>>>   raid6: neonx2   xor()  1942 MB/s
>>>   raid6: neonx4   gen()  2888 MB/s
>>>   raid6: neonx4   xor()  2334 MB/s
>>>   raid6: neonx8   gen()  2957 MB/s
>>>   raid6: neonx8   xor()  2232 MB/s
>>>   raid6: using algorithm neonx8 gen() 2957 MB/s
>>>   raid6: .... xor() 2232 MB/s, rmw enabled
>>>
>>
>> Nice to see that the placeholders get filled.
>> Did you have a chance to do some real tests?
>>
>
> Hello Markus,
>
> I haven't done any real world testing yet. Can you recommend any test
> tools or test suites in particular?
>

I am assuming you are asking about benchmarks, right? The code passes
the raid6test tests, so the correctness part should be covered
(although more testing is always better, of course)

-- 
Ard.