Your latency will be made up of the delay caused by the USB bus itself, which you can't do much about, and the processing delay in your host computer.
Have you profiled your application? Have you done any performance tuning on your system (CPU governors, R/W socket buffer sizes, etc.) What kind of hardware do you have? Could you attach the output of "sudo lshw -html"? --Neel Pandeya On 3 July 2018 at 14:57, Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 07/03/2018 05:10 PM, Wael Ali via USRP-users wrote: > > Dear all, > please help me with this issue, > > while I'm testing latency between uhd and b205mini with latency_test file > provided with uhd examples gives me the following > > Summary (test1) > ================ > Number of runs: 1000 > RTT value tested: 1 ms > ACKs received: 302/1000 > Underruns: 0 > Late packets: 698 > Other errors: 0 > > Summary (test2) > ================ > Number of runs: 1000 > RTT value tested: 2 ms > ACKs received: 784/1000 > Underruns: 0 > Late packets: 216 > Other errors: 0 > > > > > *I need rrt<= 1ms, and I need to know, how to reduce the latency between > uhd and the device? Is this a hardware issue (related to usb port)? * > I've already tried to use low latency linux kernel, but the results were > almost the same. > > OS: Ubuntu 16.04 > Kernel: 4.13.0-36-generic > UHD: 3.12.0.HEAD-0-gec786351 > libusb: 0.1.12 > > Thanks is advance > Wael Ali > > What type of computer? Are you using USB3.0, or USB2.0? > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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