On 09/10/2020 11:43 AM, Xiang Ma via USRP-users wrote:
Hi, I am running a rfid code on USRP, but there occur some errors and
warnings, and I am not sure where do the errors come from and how to
address them. Please help me.
hu@hu:~/rfid/Gen2-UHF-RFID-Reader/gr-rfid/apps$ sudo GR_SCHEDULER=STS
nice -n -20 python ./reader.py
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501;
UHD_3.15.0.HEAD-0-gaea0e2de
[INFO] [X300] X300 initialization sequence...
*[ERROR] [X300] RuntimeError: System receive MTU size is less than the
minimum required by the IP protocol.*
*[WARNING] [X300] You requested a receive frame size of (256) but your
NIC's max frame size is (0).Please verify your NIC's MTU setting using
'ip link' or set the recv_frame_size argument appropriately.UHD will
use the auto-detected max frame size for this connection.
[WARNING] [X300] For the 192.168.10.2 connection, UHD recommends a
send frame size of at least 1472 for best
performance, but your configuration will only allow 0.This may
negatively impact your maximum achievable sample rate.
Check the MTU on the interface and/or the send_frame_size argument.
[WARNING] [X300] For the 192.168.10.2 connection, UHD recommends a
receive frame size of at least 1472 for best
performance, but your configuration will only allow 0.This may
negatively impact your maximum achievable sample rate.
Check the MTU on the interface and/or the recv_frame_size argument.*
[INFO] [X300] Radio 1x clock: 200 MHz
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929b
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID:
0xF1F0D00000000000)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1311 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1311 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
[WARNING] [RFNOC] Assuming max packet size for 0/Radio_0
[WARNING] [RFNOC] Assuming max packet size for 0/Radio_0
[WARNING] [RFNOC] Assuming max packet size for 0/Radio_1
[WARNING] [RFNOC] Assuming max packet size for 0/Radio_1
[WARNING] [RFNOC] Assuming max packet size for 0/DUC_0
[WARNING] [RFNOC] Assuming max packet size for 0/DUC_1
[WARNING] [RFNOC] Assuming max packet size for 0/DmaFIFO_0
[WARNING] [RFNOC] Assuming max packet size for 0/DmaFIFO_0
'Q' to quit
[WARNING] [STREAMER] Requested recv_frame_size of 256 exceeds the
maximum possible on this stream. Using 0
Uq
--------------------------
| Number of queries/queryreps sent : 0
| Current Inventory round : 1
--------------------------
| Correctly decoded EPC : 0
| Number of unique tags : 0
--------------------------
Are you running inside a VM?
What does 'ifconfig' return for the interface the X3xx USRP is connected
to? It looks like the MTU is badly misconfigured.
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