Guys I'm getting only like 600 Hash/s max on 2x Xeon E5-2670 v3 system in benchmark (and when mining), system in redhat6:

./cpuminer --algo=cryptonight --benchmark -t24

Im getting weak performance with some other systems too (i7-3770 only 124 H/s using xmr-stak provided by nicehash)

I tried i5 on arch linux all miners available - also bad hashrate

What am I doint wrong? Do I need to configure cpu affinity maybe? Some other tweaks? Thanks!