Re: [Discuss-gnuradio] gr-ieee-80211: UDP Warning and another error

I'm no expert on what to change here, but I'd guess there's another setting that's the correct one for your specific OS & version, and that "net.core.rmem_max" is the correct one for some other OS and/or version. Maybe do a quick internet search for how to change the UDP buffer size on your OS and version? Maybe someone else in GR-land has seen this issue & knows what to do? - MLD

On Thu, Jun 27, 2019, at 12:43 PM, sumit kumar wrote:

This happens after running sudo sysctl -w net.core.rmem_max=50000000

[INFO] [UHD] linux; GNU C++ version 7.4.0; Boost_106501; UHD_3.15.0.git-1-gf83faf28

[INFO] [USRP2] Opening a USRP2/N-Series device...

[INFO] [USRP2] Current recv frame size: 1472 bytes

[INFO] [USRP2] Current send frame size: 1472 bytes

[WARNING] [UDP] The recv buffer could not be resized sufficiently.

Target sock buff size: 50000000 bytes.

Actual sock buff size: 212992 bytes.

See the transport application notes on buffer resizing.

Please run: sudo sysctl -w net.core.rmem_max=50000000

[WARNING] [UDP] The current recv_buff_size of 212992 is less than the minimum recommended size of 307200 and may result in dropped packets on some NICs

[WARNING] [UDP] The recv buffer could not be resized sufficiently.

Target sock buff size: 50000000 bytes.

Actual sock buff size: 212992 bytes.

See the transport application notes on buffer resizing.

Please run: sudo sysctl -w net.core.rmem_max=50000000

[WARNING] [UDP] The current recv_buff_size of 212992 is less than the minimum recommended size of 307200 and may result in dropped packets on some NICs

[WARNING] [UDP] The recv buffer could not be resized sufficiently.

Target sock buff size: 2500000 bytes.

Actual sock buff size: 212992 bytes.

See the transport application notes on buffer resizing.

Please run: sudo sysctl -w net.core.rmem_max=2500000

[WARNING] [UDP] The current recv_buff_size of 212992 is less than the minimum recommended size of 307200 and may result in dropped packets on some NICs

[WARNING] [UDP] The recv buffer could not be resized sufficiently.

Target sock buff size: 2500000 bytes.

Actual sock buff size: 212992 bytes.

See the transport application notes on buffer resizing.

Please run: sudo sysctl -w net.core.rmem_max=2500000

[WARNING] [UDP] The current recv_buff_size of 212992 is less than the minimum recommended size of 307200 and may result in dropped packets on some NICs

[WARNING] [UHD] 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

Traceback (most recent call last):

  File "/home/sumit/gradio/src/gr-ieee-80211/examples/wifi_rx.py", line 374, in <module>

    main()

  File "/home/sumit/gradio/src/gr-ieee-80211/examples/wifi_rx.py", line 362, in main

    tb = top_block_cls()

  File "/home/sumit/gradio/src/gr-ieee-80211/examples/wifi_rx.py", line 151, in __init__

    self.uhd_usrp_source_0.set_auto_dc_offset("", 0)

  File "/home/sumit/gradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line 3499, in set_auto_dc_offset

    return _uhd_swig.usrp_source_sptr_set_auto_dc_offset(self, enb, chan)

TypeError: in method 'usrp_source_sptr_set_auto_dc_offset', argument 2 of type 'bool'