On Fri, Jun 1, 2012 at 1:01 PM, Weixian Zhou <idea...@gmail.com> wrote:
> I used the benchmark_tx and benchmark_rx to transmit data and I have some
> questions:
> 1. I set the frequency of both benchmark_tx and benchmark_rx to 300M, the
> transmission succeed; but it failed when I set the frequency to 2.4G or
> other frequencies. Why is this?
>
What daughter board u are using, maybe your daughter board doesn't support
2.4GHz,
Target frequency: 300.000000 MHz
Actual frequency: 4500.000000 MHz
means u daughter board runs on 4.5GHz
> 2. Both the benchmark_tx and benchmark_rx gives the warning as I marked
> red: the actual frequency is not same but the transmission succeed. Why is
> it?
>
Target frequency: 300.000000 MHz
Actual frequency: 4500.000000 MHz
means u daughter board runs on 4.5GHz, maybe it doesn't support 300MHz
> 3. In the receiving end, the pktno is disordered some pktnos are much
> larger than averages. Why is it?
>
They are disrupted, so maybe some random numbers
4. What does the n_right=0 means? Does it mean the packet is corrupted in
> the receiving end?
>
n_right means how many packets are correctly received, which means their
crc check should be true (ok=True)
>
> *The benchmark_tx messages as following:*
> belltestbed@belltestbed-OptiPlex-790
> :~/Desktop/gnuradio/gr-digital/les/narrowband$ ./benchmark_tx.py -f 300M
> --from-file=pic.jpg
> linux; GNU C++ version 4.6.3; Boost_104601; UHD_003.004.002-128-g12f7a5c9
>
> >>> gr_fir_ccf: using SSE
> -- Opening a USRP2/N-Series device...
> -- Current recv frame size: 1472 bytes
> -- Current send frame size: 1472 bytes
>
> UHD Warning:
> The recv buffer could not be resized sufficiently.
> Target sock buff size: 50000000 bytes.
> Actual sock buff size: 1000000 bytes.
> See the transport application notes on buffer resizing.
> Please run: sudo sysctl -w net.core.rmem_max=50000000
>
> UHD Warning:
> The recv buffer could not be resized sufficiently.
> Target sock buff size: 50000000 bytes.
> Actual sock buff size: 1000000 bytes.
> See the transport application notes on buffer resizing.
> Please run: sudo sysctl -w net.core.rmem_max=50000000
>
> UHD Warning:
> The send buffer could not be resized sufficiently.
> Target sock buff size: 1048576 bytes.
> Actual sock buff size: 1000000 bytes.
> See the transport application notes on buffer resizing.
> Please run: sudo sysctl -w net.core.wmem_max=1048576
>
> UHD Warning:
> Unable to set the thread priority. Performance may be negatively
> affected.
> Please see the general application notes in the manual for
> instructions.
> EnvironmentError: OSError: error in pthread_setschedparam
>
> No gain specified.
> Setting gain to 17.500000 (from [0.000000, 35.000000])
>
> UHD Warning:
> The hardware does not support the requested TX frequency:
> Target frequency: 300.000000 MHz
> Actual frequency: 4500.000000 MHz
>
> UHD Warning:
> The hardware does not support the requested TX sample rate:
> Target sample rate: 0.050000 MSps
> Actual sample rate: 0.195312 MSps
>
> Symbol Rate: 25000.000000
> Requested sps: 2.000000
> Given sample rate: 195312.500000
> Actual sps for rate: 7.812500
>
> Requested sample rate: 50000.000000
> Actual sample rate: 195312.500000
> Using Volk machine: avx_32
> Warning: failed to enable realtime scheduling
> .........................................................................
>
>
> *And the benchmark_rx messages as follwing:*
> bell@bell-HP-Compaq-4000-Pro-SFF-PC
> :~/Desktop/USRP/gnuradio/gr-digital/examples/narrowband$./benchmark_rx.py -f
> 300M
> linux; GNU C++ version 4.6.3; Boost_104601; UHD_003.004.001-129-g23344268
>
> >>> gr_fir_ccf: using SSE
> -- Opening a USRP2/N-Series device...
> -- Current recv frame size: 1472 bytes
> -- Current send frame size: 1472 bytes
>
> UHD Warning:
> The recv buffer could not be resized sufficiently.
> Target sock buff size: 50000000 bytes.
> Actual sock buff size: 1000000 bytes.
> See the transport application notes on buffer resizing.
> Please run: sudo sysctl -w net.core.rmem_max=50000000
>
> UHD Warning:
> The recv buffer could not be resized sufficiently.
> Target sock buff size: 50000000 bytes.
> Actual sock buff size: 1000000 bytes.
> See the transport application notes on buffer resizing.
> Please run: sudo sysctl -w net.core.rmem_max=50000000
>
> UHD Warning:
> The send buffer could not be resized sufficiently.
> Target sock buff size: 1048576 bytes.
> Actual sock buff size: 1000000 bytes.
> See the transport application notes on buffer resizing.
> Please run: sudo sysctl -w net.core.wmem_max=1048576
>
> UHD Warning:
> Unable to set the thread priority. Performance may be negatively
> affected.
> Please see the general application notes in the manual for
> instructions.
> EnvironmentError: OSError: error in pthread_setschedparam
>
> No gain specified.
> Setting gain to 49.500000 (from [0.000000, 99.000000])
>
> UHD Warning:
> The hardware does not support the requested RX frequency:
> Target frequency: 300.000000 MHz
> Actual frequency: 2400.000000 MHz
>
> UHD Warning:
> The hardware does not support the requested RX sample rate:
> Target sample rate: 0.050000 MSps
> Actual sample rate: 0.195312 MSps
>
> Symbol Rate: 25000.000000
> Requested sps: 2.000000
> Given sample rate: 195312.500000
> Actual sps for rate: 7.812500
>
> Requested sample rate: 50000.000000
> Actual sample rate: 195312.500000
> Warning: Failed to enable realtime scheduling.
> Using Volk machine: ssse3_32
> ok = False pktno = 3850 n_rcvd = 1 n_right = 0
> ok = False pktno = 53042 n_rcvd = 2 n_right = 0
> ok = False pktno = 61454 n_rcvd = 3 n_right = 0
> ok = False pktno = 27 n_rcvd = 4 n_right = 0
> ok = False pktno = 41 n_rcvd = 5 n_right = 0
> ok = False pktno = 44 n_rcvd = 6 n_right = 0
> ok = False pktno = 44 n_rcvd = 7 n_right = 0
> ok = False pktno = 51 n_rcvd = 8 n_right = 0
> ok = False pktno = 43 n_rcvd = 9 n_right = 0
> ok = False pktno = 64 n_rcvd = 10 n_right = 0
>
>
> I am using two USRP N210.
>
> --
> Regards,
> Weixian Zhou
>
>
>
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>
--
Wenbo
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