Hi Nick, I am running the X310 interface at 1Gbit using the SFP Adapter that came with the X310.
At first I fowollowed the advice from Ettus USRP Manual <https://files.ettus.com/manual/page_usrp_x3x0_config.html#x3x0cfg_hostpc_netcfg_mtu> of setting the MTU to 1500 and <send/recv>_frame_size=1472 when running at 1Gbit, however I actually got better results in terms of latency setting the MTU to 9000 and <send/recv>_frame_size=8000. I also tried using other intermediate and smaller values but the results didn't get any better. Best regards, Jorge
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