Re: GigE (was Re: [Discuss-gnuradio] DSP based SDR)

[David Carr]

Lets say that we use UDP/RTP.  Most non connection-oriented protocols
involve an application layer connection control scheme.  For TX, each
packet has a number and the device NACKs a packet if it is received when
the buffer is full.  The host then retries NACKed packets at a given
interval and gives up if not successful after N tries.  This is still a
lot lighter than a TCP stack (and could be done in an FPGA).

-David Carr

Eric Blossom wrote:

>On Fri, Jun 24, 2005 at 02:31:41PM +0200, Harald Welte wrote:
>  
>
>>On Thu, Jun 23, 2005 at 08:52:33PM -0700, Eric Blossom wrote:
>>
>>I don't really understand why you would want flow control.
>>
>>    
>>
>
>Think about the transmit path.
>
>Simplest possible test case:
>
>  Software sine wave generator talking to transmit hardware.  There is
>  nothing throttling the signal generator.  It will produce an
>  infinite amount of data as quickly as it can.  You want the DAC
>  clock to control pacing.  Any kind of host based pacing will lead to
>  trouble (under or overruns).
>
>Eric
>
>
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