I forgot to add that the 1e6 data rate was going to a null sink. The data rate is only 1Mhz * 4bytes * 2 channels = 8M bytes per second to a null sink, which should be fine. Does anyone have any suggestions as to what settings I should have in my UDP source block in terms of payload size, buffer size, etc.?
Thanks, Marcus -----Original Message----- From: Ward, Marcus D. Sent: Monday, July 14, 2014 4:02 PM To: discuss-gnuradio@gnu.org Subject: RE: [Discuss-gnuradio] Why am I dropping data over the UDP network? The UDP sink doesn't support complex int 16, so what would I be able to change the type to in order to come to a close solution for this problem? Also, I have lowered the sample rate to very small amounts such as 1e6, but I still lose packages on the receiving end. There is a 1-gigabit switch between the two USRP's, so it is a very simple network. I don't think the network is the problem. -----Original Message----- From: discuss-gnuradio-bounces+marcus.ward=jhuapl....@gnu.org [mailto:discuss-gnuradio-bounces+marcus.ward=jhuapl....@gnu.org] On Behalf Of Marcus Müller Sent: Friday, July 11, 2014 8:59 PM To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Why am I dropping data over the UDP network? No, building vectors out of streams would (in the best case) change nothing, as you don't send individual samples but always packets full of payloads. Also, if you have a hardware device defining your data rate, you will never need a throttle, and having one will most likely only introduce problems, so remove it from your flowgraph. All throttle really does is trying to achieve a given *average* sample processing rate, and that interferes with the hardware *constantly* providing a sample rate. A few numbers in my head: 500ksps = 500 * 32kbps = 16000kbps, not very much for a gigabit ethernet! So I think it's safe to assume that the physical network is not to blame here, and usually the CPU load, maybe introduced by network handling might be to blame, if this doesn't happen with a null sink. Greetings, Marcus On 11.07.2014 19:49, madengr wrote: > Funny that I was doing the exact same thing last night, and I'm also > getting warnings on the receive end at only 500 ksps on a home LAN. > > Should the stream be vectorized before the UDP sink, and if so how > long? I tried both stream and vectors but still get the warnings. > > Lou > KD4HSO > > > Ward, Marcus D. wrote >> Hey Everyone, >> >> I am sending a signal from one USRP to another USRP through a UDP network. >> It seems to work but I am getting data loss as gnu-radio runs the >> flow graph. Hopefully someone could help me with this problem? >> >> P.S. I have the sender side (RecieveStation.jpg) and the >> Reciever/Display side (RecieveDisplay.jpg) attached > > > > > -- > View this message in context: > http://gnuradio.4.n7.nabble.com/Why-am-I-dropping-data-over-the-UDP-ne > twork-tp49283p49286.html Sent from the GnuRadio mailing list archive > at Nabble.com. > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
