PATCH: Altivec support for RAID-6
H. Peter Anvin
hpa at zytor.com
Sun Oct 31 10:37:59 EST 2004
This patch allows the RAID-6 code to use Altivec on ppc/ppc64
processors. Note that it uses gcc <altivec.h> support, so it might
require a fairly recent gcc -- but I haven't been able to get a clear
answer on *how* new.
It also changes -mcpu=power4 to -mcpu=970 when CONFIG_ALTIVEC is
enabled, since -mcpu=power4 doesn't allow -maltivec to be specified with
The results are *impressive*, however; on a PowerMac G5 I get 6.1 GB/s
(on one CPU!); this is close to the 7.8 GB/s for RAID-5, and almost 2x
what my 3 GHz Pentium4 gets.
Signed-Off-By: H. Peter Anvin <hpa at zytor.com>
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