Hi, Thanks a lot for the suggestions. I increased the MTU size to 9000. Now when I am generating signal in computer and doing fft on FPGA (with the signal source block), I can do fft with fft size 1024 with sample rate 200 MSps. This works perfectly without any overrun or timeout.
However, when I am using RFnoc radio, I am getting overrun. I am having overrun even with 1 or 5 MSps with fft size 128. I also tested with fft size 16 (still overrun). I think there is something going wrong here. I tried changing the gain and other setting, however, the result is still the same. Could you please check and let me know what might occur this issue? Best regards Sanjoy <https://mailtrack.io/> Sent with Mailtrack <https://mailtrack.io/install?source=signature&lang=en&referral=sanjoybasa...@gmail.com&idSignature=22> Sanjoy Basak Researcher Royal Military Academy Dept. Communication, Information Systems & Sensors (CISS) 30, Avenue de la Renaissance B-1000 Brussels BELGIUM Tel : +32-2441 4162 email: sanjoy.ba...@mil.be On Mon, Jul 17, 2017 at 6:48 PM, <mle...@ripnet.com> wrote: > > > You'll need to make certain that the MTU on your network card supports the > required frame sizes for your FFT. > > On 1GiGe, you're unlikely to be able to support greater than 1024-bin > FFTs, since most cards won't do jumbo frames larger than 9000 bytes. > > > > On 2017-07-17 11:38, Sanjoy Basak via USRP-users 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 > >
rfnoc_fft.grc
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