Hello, In order to decrease the latency, I was playing around with the MTU size setting it to 4000, 7000, 9000 and now a permanent error happens in my server connected to USRP. I tried it with two different USRP X310s and the problem happens in both. Where does the 7972 bytes come from? Thanks. Regards, Akın
/uhd/uhd/host/build$ uhd_usrp_probe [INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800; UHD_3.13.1.HEAD-0-gbbce3e45 [INFO] [X300] X300 initialization sequence... [INFO] [X300] Maximum frame size: 7972 bytes. [INFO] [X300] Radio 1x clock: 200 MHz [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000) [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1306 MB/s) [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1311 MB/s) [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001) [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001) [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000) [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000) [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000) [WARNING] [X300] For this connection, UHD recommends a send frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [WARNING] [X300] For this connection, UHD recommends a receive frame size of at least 8000 for best performance, but your system's MTU will only allow 7972.This will negatively impact your maximum achievable sample rate. [INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000) _____________________________________________________ / | Device: X-Series Device | _____________________________________________________ | / | | Mboard: X310 | | revision: 11 | | revision_compat: 7 | | product: 30818 | | mac-addr0: 00:80:2f:22:c1:70 | | mac-addr1: 00:80:2f:22:c1:71 | | gateway: 10.10.1.1 | | ip-addr0: 10.10.1.2 | | subnet0: 255.255.255.0 | | ip-addr1: 10.10.1.3 | | subnet1: 255.255.255.0 | | ip-addr2: 10.10.1.4 | | subnet2: 255.255.255.0 | | ip-addr3: 10.10.1.5 | | subnet3: 255.255.255.0 | | serial: 316FCFF | | FW Version: 6.0 | | FPGA Version: 35.1 | | FPGA git hash: d0360f7 | | RFNoC capable: Yes | | | | Time sources: internal, external, gpsdo | | Clock sources: internal, external, gpsdo | | Sensors: ref_locked | | _____________________________________________________ | | / | | | RX Dboard: A | | | ID: CBX-120 (0x0085) | | | Serial: 316BB64 | | | _____________________________________________________ | | | / | | | | RX Frontend: 0 | | | | Name: CBX-120 RX | | | | Antennas: TX/RX, RX2, CAL | | | | Sensors: lo_locked | | | | Freq range: 1200.000 to 6000.000 MHz | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB | | | | Bandwidth range: 120000000.0 to 120000000.0 step 0.0 Hz | | | | Connection Type: IQ | | | | Uses LO offset: No | | | _____________________________________________________ | | | / | | | | RX Codec: A | | | | Name: ads62p48 | | | | Gain range digital: 0.0 to 6.0 step 0.5 dB | | _____________________________________________________ | | / | | | RX Dboard: B | | | ID: CBX-120 (0x0085) | | | Serial: 3177160 | | | _____________________________________________________ | | | / | | | | RX Frontend: 0 | | | | Name: CBX-120 RX | | | | Antennas: TX/RX, RX2, CAL | | | | Sensors: lo_locked | | | | Freq range: 1200.000 to 6000.000 MHz | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB | | | | Bandwidth range: 120000000.0 to 120000000.0 step 0.0 Hz | | | | Connection Type: IQ | | | | Uses LO offset: No | | | _____________________________________________________ | | | / | | | | RX Codec: B | | | | Name: ads62p48 | | | | Gain range digital: 0.0 to 6.0 step 0.5 dB | | _____________________________________________________ | | / | | | TX Dboard: A | | | ID: CBX-120 (0x0084) | | | Serial: 316BB64 | | | _____________________________________________________ | | | / | | | | TX Frontend: 0 | | | | Name: CBX-120 TX | | | | Antennas: TX/RX, CAL | | | | Sensors: lo_locked | | | | Freq range: 1200.000 to 6000.000 MHz | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB | | | | Bandwidth range: 120000000.0 to 120000000.0 step 0.0 Hz | | | | Connection Type: QI | | | | Uses LO offset: No | | | _____________________________________________________ | | | / | | | | TX Codec: A | | | | Name: ad9146 | | | | Gain Elements: None | | _____________________________________________________ | | / | | | TX Dboard: B | | | ID: CBX-120 (0x0084) | | | Serial: 3177160 | | | _____________________________________________________ | | | / | | | | TX Frontend: 0 | | | | Name: CBX-120 TX | | | | Antennas: TX/RX, CAL | | | | Sensors: lo_locked | | | | Freq range: 1200.000 to 6000.000 MHz | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB | | | | Bandwidth range: 120000000.0 to 120000000.0 step 0.0 Hz | | | | Connection Type: QI | | | | Uses LO offset: No | | | _____________________________________________________ | | | / | | | | TX Codec: B | | | | Name: ad9146 | | | | Gain Elements: None | | _____________________________________________________ | | / | | | RFNoC blocks on this device: | | | | | | * DmaFIFO_0 | | | * Radio_0 | | | * Radio_1 | | | * DDC_0 | | | * DDC_1 | | | * DUC_0 | | | * DUC_1
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