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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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751ba79cc5
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> [mpe: Add VPERMXOR macro so we can build with old binutils] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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| .. | ||
| test | ||
| .gitignore | ||
| algos.c | ||
| altivec.uc | ||
| avx2.c | ||
| avx512.c | ||
| int.uc | ||
| Makefile | ||
| mktables.c | ||
| mmx.c | ||
| neon.c | ||
| neon.uc | ||
| recov_avx2.c | ||
| recov_avx512.c | ||
| recov_neon_inner.c | ||
| recov_neon.c | ||
| recov_s390xc.c | ||
| recov_ssse3.c | ||
| recov.c | ||
| s390vx.uc | ||
| sse1.c | ||
| sse2.c | ||
| tilegx.uc | ||
| unroll.awk | ||
| vpermxor.uc | ||
| x86.h | ||