Hi, Your Ethernet packet size has to be large enough to fit the entire FFT output in a single packet. Try setting your MTU to 9000.
Jonathon On Mon, Jul 17, 2017 at 8:38 AM, Sanjoy Basak via USRP-users < usrp-users@lists.ettus.com> wrote: > Hello experts, > I am trying to use RFNoc fft examples (rfnoc_fft.grc). I started with the > gr-ettus examples. However, I am having some problems with the fft size. In > the grc block, I find the option to choose 4096 fft size. However, with > hardware I could only work fft size 128 and 256. If I use 512/1024 fft > size, I get the timeout (following message) with signal source. > > timeout on chan 0 > timeout on chan 0 > timeout on chan 0 > timeout on chan 0 > > Similarly, if I am receiving with RFNoc radio, with fft size 256 I see the > correct output. However, with 512 fft size I get the following output. > > Ooverrun on chan 0O > overrun on chan 0 > Ooverrun on chan 0O > overrun on chan 0 > Ooverrun on chan 0O > overrun on chan 0 > Ooverrun on chan 0 > O > > > I also used the following commands to increase rf buffer size, however, > the results are the same. > sudo sysctl -w net.core.rmem_max=33554432 > sudo sysctl -w net.core.wmem_max=33554432 > > I attached the uhd_usrp_probe output. > > I am using ubuntu 16.04. I conected the X310 with 1Gb ethernet cable. > My hardward setup is X310/UBX-160. I am also attaching the grc file. > Please let me know what is going wrong. > > Best regards > Sanjoy Basak > > > <https://mailtrack.io/> Sent with Mailtrack > <https://mailtrack.io/install?source=signature&lang=en&referral=sanjoybasa...@gmail.com&idSignature=22> > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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