linux-kernel - Re: arch/86: AVX RAID5 xor checksumming v1

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Date:	Thu, 19 Apr 2012 10:02:28 +1000
From:	NeilBrown <neilb@...e.de>
To:	Jim Kukunas <james.t.kukunas@...ux.intel.com>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org
Subject: Re: arch/86: AVX RAID5 xor checksumming v1

On Wed, 18 Apr 2012 15:58:47 -0700 Jim Kukunas
<james.t.kukunas@...ux.intel.com> wrote:

> Hi Folks,
> 
> The following patch adds an AVX implementation of the RAID5 xor checksumming
> functions.
> 
> This version differs from version 0, in that it:
> 	0) checks whether assembler supports AVX
> 	1) replaces __attribute__(aligned(32)) with __aligned(32)
> 	2) adds do/while(0); to macro blocks
> 
> Based on xor_speed, the AVX implementation appears to be ~32% faster than the
> SSE implementation on my i7 2600:
> 
>         generic_sse: 15088.000 MB/sec
> 	avx: 19936.000 MB/sec
> 

Applied, thanks.
(though I remove the blank line at the end of the new file - the voices made
me do it, I had no choice)

NeilBrown

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