North American Network Operators Group
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Re: Software router state of the art

  • From: Florian Weimer
  • Date: Sat Jul 26 16:30:37 2008 
* William Herrin:

> The pro/1000 does not need to generate an interrupt in order to start
> a DMA transfer? Can you refer me to some documents which explain in
> detail how a card on the bus sets up a DMA transfer?

Busmaster DMA does not generate an interrupt on the host CPU.  The
interrupt is used to trigger processing on the host CPU; it can be
deferred until several frames have been written.