Alternating runs of benchmark_tx.py with "S" errors

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]

[email protected]:~/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]

[email protected]:~/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]

[email protected]:~/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

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