1. A device comprising: a statistic component configured to gather information relating to net usage for a plurality of packet flows in response to a plurality of corresponding index values; a local memory coupled to the statistic component and configured to provide the index values assignable to the plurality of packet flows; and a memory access controller coupled to the local memory and configured to transfer a portion of the plurality of corresponding index values between the local memory and a main memory to enhance capacity of the local memory at a predefined threshold.