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# fnss.netconfig.buffers.set_buffer_sizes_bw_delay_prod

`set_buffer_sizes_bw_delay_prod`(topology, buffer_unit='bytes', packet_size=1500)

  Assign a buffer sizes proportionally to the product of link bandwidth and average network RTT. This is a rule of thumb according to which the buffers of Internet routers are generally configured.

  Parameters: | topology : Topology or DirectedTopology The topology on which delays are applied. buffer_unit : string The unit of buffer sizes. Supported units are: bytes and packets packet_size : int, optional The average packet size (in bytes). It used only if packets is selected as buffer size to properly calculate buffer sizes given bandwidth and delay values.

  Examples

      >>> import fnss
      >>> topology = fnss.erdos_renyi_topology(50, 0.2)
      >>> fnss.set_capacities_constant(topology, 10, 'Mbps')
      >>> fnss.set_delays_constant(topology, 2, 'ms')
      >>> fnss.set_buffer_sizes_bw_delay_prod(topology)

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