On my Debian server 8. The load on each core is unevenly distributed, as seen in the screenshot, the first 4 core load of about 90 +++% for others it does not exceed 30% -50%. On the server, game servers are running. All started without reference to a specific processor core (ie, must be distributed evenly). At first I thought it was energy saving and lowering / raising CPU frequency, but disable it in the BIOS - did not help. Tell me what could be the problem?
uname -a
Linux 3.16.0-4-amd64 # 1 SMP Debian 3.16.36-1 + deb8u2 (2016-10-19) x86_64 GNU / Linux
lscpu
output. Also, install sysstat, runmpstat -P ALL 1
and show the Average breakdown per core - we can't really see user vs. system in that screenshot.