svn commit: r201545 - head/sys/geom/raid3
ivoras at freebsd.org
Tue Jan 5 13:29:24 UTC 2010
2010/1/5 Alexander Motin <mav at freebsd.org>:
> Author: mav
> Date: Tue Jan 5 02:06:05 2010
> New Revision: 201545
> URL: http://svn.freebsd.org/changeset/base/201545
> Slightly optimize XOR calculation.
Linux has an interesting approach to RAID XOR operations - they
calculate at boot time which method is faster, from a set of i386,
MMX, SSE and the like and then use it for what appears to be every
context requiring fast XORs.
(I know SIMD instructions would require a FP-enabled kernel, I'm just
pointing out an interesting idea)
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