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....@gmail.com> > Reviewed-by: Daniel Axtens <d...@axtens.net>
Series applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/751ba79cc552c146595cd439b21c4f cheers
