No, I run on a real Ubuntu 18.04 machine. I do not find anything special in
the ifconfig result:
(base) hu@hu:~/torch$ ifconfig
enp6s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.10.66 netmask 255.255.255.0 broadcast 192.168.10.255
inet6 fe80::ba85:84ff:febb:bb5c prefixlen 64 scopeid 0x20<link>
ether b8:85:84:bb:bb:5c txqueuelen 1000 (Ethernet)
RX packets 211324 bytes 13170668 (13.1 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 212033 bytes 13064575 (13.0 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 19
On Thu, Sep 10, 2020 at 10:15 AM Marcus D. Leech via USRP-users <
usrp-users@lists.ettus.com> wrote:
> 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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> USRP-users@lists.ettus.com
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>
--
*Xiang Ma, *Ph.D. Student
College of Engineering
Utah State University
E-mail:marxwo...@gmail.com <congsha...@gmail.com>
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