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'
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