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Old 09-30-2015, 06:00 AM   #1
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Registered: Mar 2013
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Device DMA Buffer vs RX Queue


I have been reading different books on Network Stack (for example - TCP_IP Architecture, Design and Implementation in Linux)and got one very basic doubt.

  1. The terms "Device DMA Buffer" and "RX Queue" refer to same buffer ?
  2. Any Network packet before reaching RX Queue, is stored to any other location also on the device ?
  3. If RX Queue is full then at what layer the packets are dropped ? I mean do the packets are first stored locally somewhere before checking RX Queue full?



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