Running CPU: Intel(R) Xeon(R) CPU E5620 @ 2.40GH (16 cores) - PHP FPM, NGINX

fastcgi_params

fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 256 16k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 0;
fastcgi_intercept_errors on;

fastcgi_pass            unix:/tmp/fpm.sock;

limits.conf

 soft nofile 65536
 hard nofile 65536

nginx.conf

worker_processes        8;
worker_connections      16384;
sendfile                on;
tcp_nopush              on;
keepalive_timeout       4;

php-fpm.conf

daemonize = yes
listen = /tmp/fpm.sock
pm = static
pm.max_children = 300
pm.max_requests = 1000

sysctl.conf

net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 1
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.secure_redirects = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.conf.all.rp_filter=1
net.ipv4.conf.default.rp_filter=1
net.ipv4.conf.eth0.rp_filter=1
net.ipv4.conf.lo.rp_filter=1
net.ipv4.ip_conntrack_max = 100000