Rate estimator

configname: CONFIG_NET_ESTIMATOR

Linux Kernel Configuration
└─>Networking
└─>Networking options
└─>QoS and/or fair queueing
└─>Rate estimator
In linux kernel since version 2.6.12  
Say Y here to allow using rate estimators to estimate the current
rate-of-flow for network devices, queues, etc. This module is
automatically selected if needed but can be selected manually for
statistical purposes.