ns_resetintervalstats ?-server servername?
ns_resetintervalstats resets the interval statistics to zero and begins a new interval. If servername isn't specified, the current virtual server is used.
You can, alternatively, use the CheckStats and CheckStatsInterval configuration parameters to gather interval statistics. We recommend, however, that you do not use both the Tcl interval functions (ns_intervalstats and ns_resetintervalstats) and the interval configuration parameters, because the interval parameters will reset the statistics underneath the Tcl functions and may cause unintended results.