diff options
| 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 /include | |
| 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 'include')
| -rw-r--r-- | include/linux/raid/pq.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h index 583cdd3d49ca..fd2e02461e41 100644 --- a/include/linux/raid/pq.h +++ b/include/linux/raid/pq.h @@ -107,6 +107,10 @@ extern const struct raid6_calls raid6_avx512x2; extern const struct raid6_calls raid6_avx512x4; extern const struct raid6_calls raid6_tilegx8; extern const struct raid6_calls raid6_s390vx8; +extern const struct raid6_calls raid6_vpermxor1; +extern const struct raid6_calls raid6_vpermxor2; +extern const struct raid6_calls raid6_vpermxor4; +extern const struct raid6_calls raid6_vpermxor8; struct raid6_recov_calls { void (*data2)(int, size_t, int, int, void **); |