Snort Perf Tuning Issue

Hello,

im trying to optimize snort ips on my utm. After snort settings search method and snort restart i get the below errors.

cat /proc/cpuinfo

processor       : 3

vendor_id       : GenuineIntel

cc set ips num_instances 2

After issue the command Output is 1

cc set ips snortsettings search_method ac-nq

{

          'Nattrs' => [

                        'nodelist'

                      ],

          'attrs' => [],

          'check' => 'input',

          'datatype' => 'LISTPICK',

          'fatal' => 1,

          'format' => 'The %_N requires %_d.',

          'msgtype' => 'INCOMPATIBLE_DATA',

          'name' => 'The search_method requires one of certain fixed strings.',

          'never_hide' => 0,

          'nodelist' => 'ips->snortsettings->search_method',

          'value' => 'ac-n'

        }

/var/mdw/scripts/snort restart

 #  /var/mdw/scripts/snort restart

Shutting down Inline Snort                                                        done

Starting Inline Snort (1)                                                              failed

                                                                                               failed

Any suggestion how to fix this ?

Thx