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Correct. We are going to build using the correct -march flags: https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html

>>gcc -march=native -Q --help=target

>>march=silvermont

gcc native thinks this e3 is silvermont, a low power SoC.

We built 5.6 with -O2 -march=broadwell -mno=avx (had to remove, probably pecl ext issue).

There was about a 15% performance gain. Nothing that would explain the large difference between E3 and E5.