heck ; -q, --extperfcheck <br>
                    -k check the input/ouput bandwidth of the interface<br>
                    -q also check the error and discard input/output<br>
                    -g, --64bits<br>
                    Use 64 bits counters instead of the standard counters <br>
                    when checking bandwidth &amp; performance data.<br>
                    -d, --delta=seconds<br>
                    make an average of &lt;delta&gt; seconds (default 300=5min)<br>
        