for cpu_dir in /sys/devices/system/cpu/cpu[0-9]* do online_file="$cpu_dir"/online [ -f "$online_file" ] && [ "$(cat "$online_file")" -eq 0 ] && continue file="$cpu_dir"/cpufreq/scaling_governor [ -f "$file" ] && echo "performance" > "$file" done sysctl -w net.ipv4.tcp_syncookies=0 enable_apache_mod auth_basic authn_core authn_file authz_core authz_host authz_user access_compat systemctl restart apache2 ab -k -q -t 300 -n 1000000 -c 4000 127.0.0.1/