Found the issue right now. While i was using a flow table without creating with timeout flag, the content increases dynamically and would never be flushed. Now, i set a timeout of 1s and the flow table flush older content. Execution time is stable again: >real 0m0.015s >user 0m0.001s >sys 0m0.002s -- Regards Alex -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html