On 02/20/2019 07:50 AM, akin soysal via USRP-users wrote:
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)
Some network hardware will accept any MTU you give it, but only actually
be able to deliver a much smaller MTU. This may be the case here.
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