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From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Matt Brown <matthew.brown.dev@gmail.com>, linuxppc-dev@lists.ozlabs.org
Cc: dja@axtens.net
Subject: Re: [v6, 1/2] raid6/altivec: Add vpermxor implementation for raid6 Q syndrome
Date: Tue, 20 Mar 2018 09:22:46 +1100 (AEDT)	[thread overview]
Message-ID: <404rD729Rpz9sVr@ozlabs.org> (raw)
In-Reply-To: <20170804034233.13628-1-matthew.brown.dev@gmail.com>

On Fri, 2017-08-04 at 03:42:32 UTC, Matt Brown wrote:
> This patch uses the vpermxor instruction to optimise the raid6 Q syndrome.
> This instruction was made available with POWER8, ISA version 2.07.
> It allows for both vperm and vxor instructions to be done in a single
> instruction. This has been tested for correctness on a ppc64le vm with a
> basic RAID6 setup containing 5 drives.
> 
> The performance benchmarks are from the raid6test in the /lib/raid6/test
> directory. These results are from an IBM Firestone machine with ppc64le
> architecture. The benchmark results show a 35% speed increase over the best
> existing algorithm for powerpc (altivec). The raid6test has also been run
> on a big-endian ppc64 vm to ensure it also works for big-endian
> architectures.
> 
> Performance benchmarks:
> 		raid6: altivecx4 gen() 18773 MB/s
> 		raid6: altivecx8 gen() 19438 MB/s
> 
> 		raid6: vpermxor4 gen() 25112 MB/s
> 		raid6: vpermxor8 gen() 26279 MB/s
> 
> Signed-off-by: Matt Brown <matthew.brown.dev@gmail.com>
> Reviewed-by: Daniel Axtens <dja@axtens.net>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/2de95953c4e6ad54c9bee5e6a5518d

cheers

  parent reply	other threads:[~2018-03-19 22:22 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-04  3:42 [v6 1/2] raid6/altivec: Add vpermxor implementation for raid6 Q syndrome Matt Brown
2017-08-04  3:42 ` [v6 2/2] lib/raid6: Build proper raid6test files on powerpc Matt Brown
2017-08-09 13:26 ` [v6 1/2] raid6/altivec: Add vpermxor implementation for raid6 Q syndrome Michael Ellerman
2017-08-09 23:41   ` Matt Brown
2017-08-09 23:41     ` Matt Brown
2018-03-19 22:22 ` Michael Ellerman [this message]
2018-03-20 10:15 ` [v6, " Michael Ellerman

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