Thank you for your insight Michael. My block must always produce a fixed size chunk of data, so it is not directly applicable, but I could use a similar parameter to decide if I would produce stuffing in the current call to work or not. Then I could query the status of the output buffer to do so. I will try that.
Thank you Wheberth Em qui, 15 de ago de 2019 às 10:29, Michael Dickens < michael.dick...@ettus.com> escreveu: > Hi Wheberth - In a similar block I've created in the past, I include a > parameter, let's call it "stuffing_size", that is the number of items to > stuff when stuffing occurs. If this value is small, then there is "small" > latency between when the PDU comes in and its data is output ... but, the > block uses a lot of CPU time spinning checking whether it should do "work". > If this value is large, then the block uses very little CPU time but the > latency between PDU reception and output is "large". You have to play > around to find the sweet spot trading off latency and CPU use, but that's > not too difficult. Maybe this is the way to go for your situation? Hope > this is useful! - MLD > > On Wed, Aug 14, 2019, at 10:56 PM, Wheberth Damascena Dias wrote: > > Hi all, I have created an OOT block that receives PDUs as input, stores > the data in a FIFO buffer and generates a stream as output. Case no data is > available at the FIFO, stuffing data is generated. > The block (kind of) works as intended, but when it is on the system with > no data PDUS being received it does its job and generates stuffing. The > problem is that, if I understood correctly, the rate of generation is > controlled by the blocks downstream (via backpressure) meaning it fills all > buffers of the blocks downstream up to the USRP. > This makes the next PDUs that arrive to suffer a very high latency. > I am trying to find a way to limit the buffer of the blocks downstream, > but it doesn't feel like the right way to deal with this. Another idea is > to query the status of the output buffer (via pc_output_buffers_full()) and > generate stuffing data just when it is empty. > Anyone have faced similar issue? Am I in the right direction? > Any comments are appreciated. > > Best Regards > -- > *Wheberth Damascena Dias* > _______________ _____ _____ __ ___ __ _ _ _ _ > http://www.linkedin.com/in/wheberth > e-mail:whebe...@gmail.com > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > >
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