Hi Guys, Thanks a lot for the tips. I stopped the network manager and everything worked fine.
I am also copying some notes I took as a part of learning from this bug. Since these emails are archived, I thought it might help someone else having this issue. Network Manager issues: The server network manager started doing weird things and was messing up the SFP connection to the USRP. It is recommended that the network manager is disabled on the server - else it can potentially interrupt your testing. Details: One symptom: SFP connection was going down and coming up every 45 seconds for eg. It would be down for a second and come back up. Therefore say if I was collecting data onto a file for 60 seconds, data collection would stop. This is detrimental to our testing. How do we know that the connection is down: when you have a serial connection on to the USRP and have a screen session in place, error messages are displayed onto the screen/terminal. This displays if the connection is up or down. Exact command used: 1. To stop network manager: sudo service network-manager stop 2. sudo ifconfig eth0 down (eth0 is a placeholder for the network you are referring to) 3. setting IP via ifconfig utility. sudo ifconfig eth0 [static IP address: say 192.168.6.10] netmask [netmask - typically 255.255.255.0] up 4. ifconfig etho - check IP, netmask and gateway are all set correctly (GW should be something like 192.168.6.1. If not set gateway explicitly via ifconfig) The network manager might come back up on a reboot. You will have to issue the command on every reboot or check for other methods online for a persistent setting. Regards Venkatesh On Thu, Sep 3, 2020 at 12:41 PM Venkatesh Sathyanarayanan < [email protected]> wrote: > Thanks a lot Michael and cedric for taking time to answer my questions.. I > will try to stop the network manager and see if that helps. > > Regards > Venkatesh > > On Thursday, September 3, 2020, Michael Dickens <[email protected]> > wrote: > >> In my experience, this happens when the networking isn't stable, which >> can be for all sorts of reasons: >> >> * connectors / cables are flaky; >> >> * host SW configuration isn't quite correct; >> >> * actual NIC has issues, HW or FW / configuration; >> >> * USRP NIC has issues ... very rare, but it can happen; >> >> * USRP FPGA has issues ... again rare, but it can happen; >> >> * USRP filesystem has issues ... could be the FS itself, or >> configuration ... this happens sometimes & is usually resolved by >> overwriting the whole SDcard filesystem & starting from "go" there. >> >> If you're Linux has the network manager, that doesn't help things since >> it thinks it knows better than you what to be doing. >> >> There is no "one size fits all" answer unfortunately; just investigate >> the networking & make sure all of the parts are functional. >> >> Hope this is useful! - MLD >> >> On Thu, Sep 3, 2020 at 3:30 AM Cedric Roux via USRP-users < >> [email protected]> wrote: >> >>> maybe network manager (if you have that thing running) on the >>> computer doing funny things with the interface? I had this >>> issue with some 4g dongles in the past. >>> >>> On 2020-09-03 01:01, Venkatesh Sathyanarayanan via USRP-users wrote: >>> > Hi, >>> > >>> > Small correction: >>> > >>> > *Questions:* >>> > I notice that the test stops when the link goes down every 45 seconds. >>> > This happens for all types of tests(with and without GUI). >>> > Kindly let me know how to debug this - i.e. why the link goes down >>> every >>> > 45 seconds? >>> > >>> > Regards >>> > Venkatesh >>> > >>> > On Wed, Sep 2, 2020 at 3:10 PM Venkatesh Sathyanarayanan >>> > <[email protected] <mailto:[email protected]>> wrote: >>> > >>> > Hi, >>> > >>> > >>> > *Setup details:* >>> > I am using an USRP N310 and I have the host computer connected to >>> > the USRP via SFP cable. I additionally have a serial connection >>> > between the two and have a screen session running. >>> > >>> > *Observation:* >>> > On the screen session, I noticed the following messages: >>> > [ 2151.041079] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > [ 2195.841088] nixge 40000000.ethernet sfp0: Link is Down >>> > [ 2196.961090] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > [ 2241.761098] nixge 40000000.ethernet sfp0: Link is Down >>> > [ 2242.881106] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > [ 2287.681109] nixge 40000000.ethernet sfp0: Link is Down >>> > [ 2288.801114] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > [ 2333.601129] nixge 40000000.ethernet sfp0: Link is Down >>> > [ 2334.721127] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > [ 2379.521132] nixge 40000000.ethernet sfp0: Link is Down >>> > [ 2380.641137] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > [ 2425.441143] nixge 40000000.ethernet sfp0: Link is Down >>> > [ 2426.561149] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > [ 2471.361159] nixge 40000000.ethernet sfp0: Link is Down >>> > [ 2472.481166] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > [ 2517.281166] nixge 40000000.ethernet sfp0: Link is Down >>> > [ 2518.401171] nixge 40000000.ethernet sfp0: Link is Up - >>> > 10Gbps/Full - flow control off >>> > >>> >>> .......................................................................................................................................................................... >>> > >>> >>> .......................................................................................................................................................................... >>> > >>> > >>> >>> .......................................................................................................................................................................... >>> > >>> >>> .......................................................................................................................................................................... >>> > >>> > *Questions:* >>> > When I have a GNU radio GRC running with an active GUI displaying >>> > the spectrum, I see that it halts at the time when the link goes >>> down. >>> > When I run a file with no GUI active - say IQ samples saved to a >>> > file, things running in the background and I do not see any >>> > interruption. >>> > >>> > 1. Kindly let me know why I am seeing this issue of link going >>> down >>> > every 45 seconds and >>> > 2. also if this could potentially affect my tests (all my tests >>> are >>> > without any GUI.) >>> > >>> > >>> > Regards >>> > Venkatesh >>> > >>> > >>> > _______________________________________________ >>> > USRP-users mailing list >>> > [email protected] >>> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> > >>> >>> _______________________________________________ >>> USRP-users mailing list >>> [email protected] >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >>
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