[Discuss-gnuradio] Alternating runs of benchmark_tx.py with "S" errors

[Kevin Rosenberg]

Hello,

With a recent B100 and WBX card and using gnuradio 3.6.3, I'm getting 
alternating normal runs of benchmark_tx.py and runs with many "S" errors. The 
cycle then repeats. I'm using Ubuntu 12.10 with a 2.7 GHz i7 CPU.

The output of two runs of benchmark_tx.py is followed by the output of 
uhd_usrp_probe

Any help would be appreciated,

Kevin

[First execution without problems]

address@hidden:~/gnuradio/gr-digital/examples/narrowband$ time 
./benchmark_tx.py -f 1G -r 1e6 -M 1 --args "name=b100a"
linux; GNU C++ version 4.7.2; Boost_104900; UHD_003.005.001-29-g3cb515f7

>>> gr_fir_ccf: using SSE
-- USRP-B100 clock control: 10
--   r_counter: 2
--   a_counter: 0
--   b_counter: 20
--   prescaler: 8
--   vco_divider: 5
--   chan_divider: 5
--   vco_rate: 1600.000000MHz
--   chan_rate: 320.000000MHz
--   out_rate: 64.000000MHz
-- 

No gain specified.
Setting gain to 5.500000 (from [-20.000000, 31.000000])
Using Volk machine: avx_64_mmx
......................................................................................................................U.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
real    0m12.258s
user    0m0.252s
sys     0m0.744s


[Second execution with "S" errors]

address@hidden:~/gnuradio/gr-digital/examples/narrowband$ time 
./benchmark_tx.py -f 1G -r 1e6 -M 1 --args "name=b100a"
linux; GNU C++ version 4.7.2; Boost_104900; UHD_003.005.001-29-g3cb515f7

>>> gr_fir_ccf: using SSE
-- USRP-B100 clock control: 10
--   r_counter: 2
--   a_counter: 0
--   b_counter: 20
--   prescaler: 8
--   vco_divider: 5
--   chan_divider: 5
--   vco_rate: 1600.000000MHz
--   chan_rate: 320.000000MHz
--   out_rate: 64.000000MHz
-- 

No gain specified.
Setting gain to 5.500000 (from [-20.000000, 31.000000])
Using Volk machine: avx_64_mmx
..........................................................................................................................SS.S.S.SS...........S..SS....S.S.S.S.....SS.....S.S..S....S.S.....SS.S....SS.....S.S....S.S..S....S....S..S....S.....S.....S.....S.....SS..SS....S....S......S.....S.S....SS.....S.....S.S...S..SS......SSS....S.....S.S..S.S....S.S.....S.S....SS.S.S..SS..S....S....S....S..S.....S.SS..S....S....S.....S.....SS..S.S....S.....S....S..S.S.S.....S....S...S.S.S.SS...S.....S.SS....S.....S.SS.....S.S....S.S.SS....S.S.S....S......S....S.....S.....S....S.S.SS.....S.....S....S.....S....S..S.....S..S....S.SS.....S....S..S....S.....S.S....S....S......S....S....S.....S.....S....SS..SS.....S.....S...S.....S....S.SSS..S....S.S.SS.SS.....S.S....SS.S.S....S.....S.....S....S.....S.SSS......S....S..SSS.....S..S.....SS....S.S..S.S.SS.....S...S.S...S.....S....SSS.SS....SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
real    0m6.721s
user    0m0.328s
sys     0m0.676s


[uhd_usrp_probe]

address@hidden:~/gnuradio/gr-digital/examples/narrowband$ uhd_usrp_probe --args 
"name=b100a"
linux; GNU C++ version 4.7.2; Boost_104900; UHD_003.005.001-29-g3cb515f7

-- USRP-B100 clock control: 10
--   r_counter: 2
--   a_counter: 0
--   b_counter: 20
--   prescaler: 8
--   vco_divider: 5
--   chan_divider: 5
--   vco_rate: 1600.000000MHz
--   chan_rate: 320.000000MHz
--   out_rate: 64.000000MHz
-- 
  _____________________________________________________
 /
|       Device: B-Series Device
|     _____________________________________________________
|    /
|   |       Mboard: B100
|   |   revision: 8192
|   |   serial: EFR11XCB1
|   |   name: b100a
|   |   FPGA Version: 11.1
|   |   
|   |   Time sources: none, external, _external_
|   |   Clock sources: internal, external, auto
|   |   Sensors: ref_locked
|   |     _____________________________________________________
|   |    /
|   |   |       RX DSP: 0
|   |   |   Freq range: -32.000 to 32.000 Mhz
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: A
|   |   |   ID: WBX v3, WBX v3 + Simple GDB (0x0057)
|   |   |   Serial: E9R26SEXW
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: WBXv3 RX+GDB
|   |   |   |   Antennas: TX/RX, RX2, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 68.750 to 2200.000 Mhz
|   |   |   |   Gain range PGA0: 0.0 to 31.5 step 0.5 dB
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: A
|   |   |   |   Name: ad9522
|   |   |   |   Gain range pga: 0.0 to 20.0 step 1.0 dB
|   |     _____________________________________________________
|   |    /
|   |   |       TX DSP: 0
|   |   |   Freq range: -32.000 to 32.000 Mhz
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: A
|   |   |   ID: WBX v3 (0x0056)
|   |   |   Serial: E9R26SEXW
|   |   |   ID: WBX + Simple GDB, WBX v3 + Simple GDB, WBX v4 + Simple GDB 
(0x004f)
|   |   |   Serial: EAR26R2GS
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: WBXv3 TX+GDB
|   |   |   |   Antennas: TX/RX, CAL
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 68.750 to 2200.000 Mhz
|   |   |   |   Gain range PGA0: 0.0 to 31.0 step 1.0 dB
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: A
|   |   |   |   Name: ad9522
|   |   |   |   Gain range pga: -20.0 to 0.0 step 0.1 dB