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| author | Anton Blanchard <anton@samba.org> | 2013-10-14 14:03:58 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-10-30 09:02:28 +0400 |
| commit | ef1313deafb7baa6d3382044e962d5ad5e8c8dd6 (patch) | |
| tree | 30584552d8b2907bb8360a7d4e1cab28e3215585 /Documentation | |
| parent | 07fb41a7525539d7ad37c25f2a2689fd95a6ab68 (diff) | |
| download | linux-ef1313deafb7baa6d3382044e962d5ad5e8c8dd6.tar.xz | |
powerpc: Add VMX optimised xor for RAID5
Add a VMX optimised xor, used primarily for RAID5. On a POWER7 blade
this is a decent win:
32regs : 17932.800 MB/sec
altivec : 19724.800 MB/sec
The bigger gain is when the same test is run in SMT4 mode, as it
would if there was a lot of work going on:
8regs : 8377.600 MB/sec
altivec : 15801.600 MB/sec
I tested this against an array created without the patch, and also
verified it worked as expected on a little endian kernel.
[ Fix !CONFIG_ALTIVEC build -- BenH ]
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions