Re: [Discuss-gnuradio] Re: UHD Announcement - February 25rd 2011

[Josh Blum]

On 02/28/2011 08:21 AM, Feng Andrew Ge wrote:
> Josh,
> 
> Thanks for sharing the information and your changes sound quite reasonable.
> 
> However, it seems that your changes have introduced some bugs at the
> transmitter side. I updated my system using your new code (following
> your instructions in your Feb. 24's email titled "Re: GRC + N210 +
> RFX2200 + UHD not working"); then I ran python-based benchmark_tx.py. I
> tested two cases: in the first case, I sent packets continuously and it
> worked well; in the second case, I sent packets every second and the
> transmitter side could send only about 10~12 packets, then stopped
> sending data into USRP2 (based on observation from wireshark results).
> Both cases used 1500B for each packet and the send-buff-size was 100kB.
> 

I think this is a problem in gr-uhd:
http://gnuradio.org/cgit/gnuradio.git/tree/gr-uhd/lib/gr_uhd_usrp_sink.cc?h=next#n183

I am putting a time stamp into the packet. This is helpful for a
multi-channel continuous transmission, but not single channel
non-continuous.

Can you apply the diff attached and let me know if that fixes the problem?

Thanks,
-Josh

gr_uhd_usrp_sink.diff
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