I am following the N310 Getting Started Guide, which states to set MTUBytes to 8000 for 1 GB on SFP0. If that is incorrect, perhaps the guide should be updated? https://kb.ettus.com/N300/N310_Getting_Started_Guides
From: Ali Dormiani <sdorm...@eng.ucsd.edu> Sent: Monday, October 15, 2018 7:21 PM To: Lundberg, Daniel <daniel.lundb...@gtri.gatech.edu> Cc: usrp-users <USRP-users@lists.ettus.com> Subject: Re: [USRP-users] N310 MPMD link speed warnings 1 Gbe Ethernet can't handle that much data. Most 1 Gbe class NIC controllers prevent you from setting the MTU over 1500 anyway. I would be surprised if the GUI settings in network manager actually went through. If you type 'ifconfig' in a command console the host NIC is probably still running at 1500 MTU. https://en.wikipedia.org/wiki/Ethernet_frame#Ethernet_II The N310 supports two modes. 1. 1.25 Gbe mode 2. 10 Gbe mode I think the warning is saying that it does not know what to do (link negotiation with your host NIC failed) so it defaults to the slower of the two modes. On Mon, Oct 15, 2018 at 3:22 PM Lundberg, Daniel via USRP-users <usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>> wrote: I am using Ubuntu 18.04, an N310 with the current master builds. I am currently testing basic operation using a USB/Ethernet adaptor for the management connection, and a 1 GB Ethernet connection straight from the computer’s NIC port to the SFP0 port on the N310. I have built from source and can make it through all of the examples and benchmarking exercises successfully. I am also able to successfully run the tx_waveform example with a streaming rate of 25e6 with a master clock rate of 125e6. This seems to be the limit, 31.25e6 causes underruns. Despite the streaming link seeming to work, there are chronic warnings such as: “[WARNING] [MPMD] Could not determine link speed; using 1GibE max speed of 125000000 The network connections were set up within Ubuntu’s network manager, with MTUBytes = 8000 (also set in the N310’s /etc/system/network/ files). Autonegotiation is enabled on both ends, per ethtool outputs. Any input on where these warnings originate, and if there is a way to suppress them? Thank you Dan _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com<mailto:USRP-users@lists.ettus.com> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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