Hi,
This is out topic nginx development, but may be interesting to know.
Intel software (tools, libraries, compilers, etc), only perform optimal
with Intel chips!
Thay can detect non-intel chips and disable intentional any faster or
better feature.

See all in http://www.agner.org/optimize/blog/read.php?i=49 and
http://software.intel.com/en-us/articles/optimization-notice/#opt-en

Best regards,

Ranier Vilela

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