• Anton Blanchard's avatar
    powerpc: Add VMX optimised xor for RAID5 · ef1313de
    Anton Blanchard authored
    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: default avatarAnton Blanchard <anton@samba.org>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    ef1313de
Makefile 1.09 KB