The ATLAS Dataflow system is composed of distributed hardware and software responsible for
buffering and transporting event data from the Readout system to the High Level Trigger and
to the event storage. By building on the experience gained during the successful first run of
the LHC, the ATLAS Data Acquisition (DAQ) architecture has been simplified and upgraded to
take advantage of state of the art technologies resulting in a maximized efficiency and improved
performance. This proceeding describes the new architecture of the ATLAS DAQ system and
highlights its performance during Run 2 of the LHC.