Конфиг:

worker_processes 12;
worker_cpu_affinity 000001 000010 000100 001000 010000 000111 000011 000101 001001 000110 010010 010001;
worker_priority -5;
worker_rlimit_nofile 65535;
timer_resolution 100ms;
events {
use epoll;
worker_connections 16384;
accept_mutex off;
}

Результат - http://picfree.org/di-AXLM.png

Конфиг ( без аффинити ):

worker_processes 12;
worker_priority -5;
worker_rlimit_nofile 65535;
timer_resolution 100ms;
events {
use epoll;
worker_connections 16384;
accept_mutex off;
}

Результат - http://picfree.org/di-UF6Q.png