+ 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
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
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
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George Hadley
ECE Lab Coordinator
Purdue University
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