Hi Marcus, Since you forgot to copy the email to me, I have to reply your email here. 'sudo' is for using dpdk. Do you have any way to use dpdk without super authority?
Hi Rob, Your information is very helpful. I will try that next week when I am back to the office. Thanks. Best regards, Damon On Thu, 25 Jun 2020 at 01:46, guowang qiu <[email protected]> wrote: > Hi all, > > I am trying to set my USRP X310 to send out signals in burst mode at > 200Msps sample rate on two channels. My target is sending out bursts of > 100ms without underflow. > The OS is Ubuntu 18.04, UHD version v3.15.0.0, DPDK is used in the test. > The CPU is set to 4.2GHz. > The X310 is connected to the host by dual 10 Gigabit Ethernet. > > sudo /usr/local/lib/uhd/examples/tx_bursts > --args="type=x300,use_dpdk=1,addr=192.168.30.2,second_addr=192.168.40.2,send_frame_size=8000,num_send_frames=512" > --repeat --dilv --nsamps=20000000 --channels=0,1 --rate=200e6 > > If nsamps is set to 100000, there is no U printed. But if nsamps is large > than 120000, the terminal prints a lot of U. > Question 1: the depth of DMA FIFO is 32MB by default, I guess there should > be 8M samples stored in the DMA FIFO, why it seems that it just store 100K > samples? > Question 2: is there anything I could do to achieve my goal? > > Best regards, > Damon > >
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