papi_get_perf_data description

This function is used to retrieve the policy performance data from the Policy Agent.

Policy performance metrics collected by the kernel are affected by the FLUSH/NOFLUSH parameter on the Policy Agent TcpImage configuration statement. FLUSH causes the metrics values to be reset to 0 at the following times:

When a new TcpImage statement is processed for the first time, including Policy Agent starting. This should not be a concern in most cases.
When a MODIFY REFRESH command is entered.

Metrics are never reset when NOFLUSH is specified. See z/OS Communications Server: IP Configuration Reference and the policy-based networking information in z/OS Communications Server: IP Configuration Guide for more information.

Note: Changes to policy definitions might not cause immediate changes in performance metrics, due to averaging and smoothing over several sampling intervals. A period of time must elapse after a policy change in order to reach a new steady state.