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| author | Matt Brown <matthew.brown.dev@gmail.com> | 2017-08-04 13:42:32 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-20 16:47:25 +1100 |
| commit | 751ba79cc552c146595cd439b21c4ff8998c3b69 (patch) | |
| tree | fc7aa71ed1ca788ab3a9c553021f7c876ccd4115 /lib/raid6/algos.c | |
| parent | 7004263bd4f4c79da9ca2a1d04d38d4d6ed609ab (diff) | |
| download | linux-751ba79cc552c146595cd439b21c4ff8998c3b69.tar.gz linux-751ba79cc552c146595cd439b21c4ff8998c3b69.tar.bz2 linux-751ba79cc552c146595cd439b21c4ff8998c3b69.zip | |
lib/raid6/altivec: Add vpermxor implementation for raid6 Q syndrome
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>
Diffstat (limited to 'lib/raid6/algos.c')
| -rw-r--r-- | lib/raid6/algos.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c index 476994723258..b2e681018145 100644 --- a/lib/raid6/algos.c +++ b/lib/raid6/algos.c @@ -74,6 +74,10 @@ const struct raid6_calls * const raid6_algos[] = { &raid6_altivec2, &raid6_altivec4, &raid6_altivec8, + &raid6_vpermxor1, + &raid6_vpermxor2, + &raid6_vpermxor4, + &raid6_vpermxor8, #endif #if defined(CONFIG_TILEGX) &raid6_tilegx8, |