Ah! This is something I did not know about the VMWare NAT implementation. TCP can code, UDP just falls apart in situations where the stack re-orders. Other applications using UDP would have similar issues, assuming they have out-of-order detection at all, which isn't guaranteed.
On 2015-07-09 09:28, Marcus Müller wrote: >> + Adapter enabled and attached to NAT > there we have our culprit. > > NAT doesn't work very well with UHD, because for reasons obscure to my mortal > mind, VirtualBox (VMWare, also) likes to reorder packets. Now, as a realtime > device, the USRP can't handle that, and thus, UHD can't take care of packets > that arrive out of order. > > Use bridging instead of NAT, or don't use a VM at all. > > Best regards, > the other Marcus > > On 07/09/2015 03:21 PM, George Hadley wrote: I am indeed running inside a VM > presently. Details below: > > Hardware: > USRP N210 (2x) connected to dual-port gigabit ethernet card: > http://www.newegg.com/Product/Product.aspx?Item=N82E16833166096 [2] > > Software: > Windows 7 host OS > VirtualBox VM running Mint Linux 17.1 (Mate Desktop edition) > Network settings: > + Adapter enabled and attached to NAT > + No port forwarding settings defined > > It may be noteworthy that the receive operation of the USRPs works as > expected. Only transmit doesn't appear to be working properly. > > Thanks, > George > > On 7/9/2015 9:11 AM, mle...@ripnet.com wrote: > > This is usually due to your network subsystem re-ordering packets, which is > never supposed to happen but certain > 1GiGe interfaces, particularly USB ones, do this quite a bit. > > Are you running inside a VM? > > What kind of network interface do you have? > > On 2015-07-09 09:09, George Hadley wrote: > > Hello, > > I'm working on developing some gnuradio exercises, some of which involve > using USRP N210 devices as transmitters. When I attempt to run the related > flowgraphs, I get a stream of sequence errors (S) in the GRC log window. > Attached are a pair of GRC flowgraphs in which I am getting this error. I > have tried installing the latest images to the USRPs and updating to the > latest version of gnuradio available on the github master branch. Can > somebody please point me to what I'm doing wrong? I've searched around on the > topic for quite awhile, to no avail. > > Thanks, > George > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [1] -- George Hadley ECE Lab Coordinator Purdue University _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [1] _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [1] Links: ------ [1] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [2] http://www.newegg.com/Product/Product.aspx?Item=N82E16833166096
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