[Discuss-gnuradio] File sink causes "S" errors

[Thomas Hobiger]

Hi everybody,

I am running a USRP2 with a DBSRX and talking to the hardware via raw 
ethernet. Running GRC goes well (e.g. doing a real-time FFT spectrum), 
but when I start recording on disc I get many "S" messages ("2 
successive packets which do not have 2 successive sequence numbers") 
after about 10 seconds. I am currently sampling with a decimation of 4, 
but the problem remains with other decimation factors as wekk, just the 
messages show up slightly delayed. I think the HD itself is not the 
reason as I am recording to a 80 GB SSD, which has EXT4 and is mounted 
in a quite fast mode (I have benchmarked the I/O giving me much more 
bandwidth than what streams in from the USRP2).
I have started to modify parts of the GNURADIO code, but changing buffer 
sizes does not help much.

Is there anybody who experienced similar troubles?

Regards,
  Thomas Hobiger

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Dr. Thomas Hobiger
Space-Time Measurement Project
Space-Time Standards Group
New Generation Network Research Center
National Institute of Information and Communications Technology
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