[PATCH] powerpc: pair loads and stores in copy_4k_page
Mark Nelson
markn at au1.ibm.com
Thu Feb 11 17:25:01 EST 2010
Hi Anton,
On Thursday 11 February 2010 15:07:54 Anton Blanchard wrote:
>
> A number of our chips like loads and stores to be paired. A small kernel
> module testcase shows the improvement of pairing loads and stores in
> copy_4k_page:
>
> POWER6: +9%
> POWER7: +1.5%
I just tried this on one of our QS22 cell blades and it seems to cause
about half a percent speedup but that looks like it's within the noise
of the results that I'm getting.
In any case it doesn't look like it has a negative effect for cell.
Looks good!
Mark
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