usrp-users@lists.ettus.com
Discussion and technical support related to USRP, UHD, RFNoC
View all threadsX310 problem with LLLLL
Hi everyone,
i am working with openairinterface, and i am experiencing a strange behavior with the X310 (branded USRP-2954R before flashing).When i run a code with a certain configuration file using a B210 everything works as expected, while when using an X310 i almost always end seeing a flood of LLL on the screen.That happens, for those who have familiarity with openairinterface, either running the gNB or the UE.
The X310 is flashed with the XG firmware using uhd 4.4 (but also with other 4.x versions happens the same) and connected to an Ubuntu 22.04 machine with an ethernet cable.
The USRP an the network interface are configured according to the Ettus guide https://kb.ettus.com/Getting_Started_with_4G_LTE_using_Eurecom_OpenAirInterface_(OAI)_on_the_USRP_2974
Though, with the uhd test utilities, like benchmark_rate, no issue appear.
Do you have any idea on how i could debug this situation?
Already asked the OpenAirInterface, but no reply yet.
thanks,
andrea
On 30/08/2023 10:57, Andrea De Jesus Torres via USRP-users wrote:
Hi everyone,
i am working with openairinterface, and i am experiencing a strange
behavior with the X310 (branded USRP-2954R before flashing).
When i run a code with a certain configuration file using a B210
everything works as expected, while when using an X310 i almost always
end seeing a flood of LLL on the screen.
That happens, for those who have familiarity with openairinterface,
either running the gNB or the UE.
The X310 is flashed with the XG firmware using uhd 4.4 (but also with
other 4.x versions happens the same) and connected to an Ubuntu 22.04
machine with an ethernet cable.
The USRP an the network interface are configured according to the
Ettus guide
https://kb.ettus.com/Getting_Started_with_4G_LTE_using_Eurecom_OpenAirInterface_(OAI)_on_the_USRP_2974
Though, with the uhd test utilities, like benchmark_rate, no issue appear.
Do you have any idea on how i could debug this situation?
Already asked the OpenAirInterface, but no reply yet.
thanks,
andrea
USRP-users mailing list --usrp-users@lists.ettus.com
To unsubscribe send an email tousrp-users-leave@lists.ettus.com
Well, 'L' is "late packet". It's likely that the software is asking for
a packet time that is too "tight" given whatever latency is
produced by your systems network stack.
OAI probably needs to investigate this.
Your CPU might not be powerful enough, or your system may not be
sufficiently performance-tuned, or the MTU value is not correct for your 10
Gbps Ethernet connections (you would want to use an MTU value of 8000 or
9000). Also make sure that the two 10 Gbps Ethernet interfaces are
connected correctly with the right IP addresses between the host computer
and the radio.
https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks
--Neel Pandeya
+1-512-683-8076 (office)
+1-512-413-5696 (mobile)
On Wed, 30 Aug 2023 at 11:15, Marcus D. Leech patchvonbraun@gmail.com
wrote:
On 30/08/2023 10:57, Andrea De Jesus Torres via USRP-users wrote:
Hi everyone,
i am working with openairinterface, and i am experiencing a strange
behavior with the X310 (branded USRP-2954R before flashing).
When i run a code with a certain configuration file using a B210
everything works as expected, while when using an X310 i almost always end
seeing a flood of LLL on the screen.
That happens, for those who have familiarity with openairinterface, either
running the gNB or the UE.
The X310 is flashed with the XG firmware using uhd 4.4 (but also with
other 4.x versions happens the same) and connected to an Ubuntu 22.04
machine with an ethernet cable.
The USRP an the network interface are configured according to the Ettus
guide
https://kb.ettus.com/Getting_Started_with_4G_LTE_using_Eurecom_OpenAirInterface_(OAI)_on_the_USRP_2974
Though, with the uhd test utilities, like benchmark_rate, no issue appear.
Do you have any idea on how i could debug this situation?
Already asked the OpenAirInterface, but no reply yet.
thanks,
andrea
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com
Well, 'L' is "late packet". It's likely that the software is asking for a
packet time that is too "tight" given whatever latency is
produced by your systems network stack.
OAI probably needs to investigate this.
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com
Yes, I have also set the MTU=9000 and followed that guide, but didn't improve much. The CPU I am using is enough powerful i guess (an i9-10980XE ), as the same sampling rate works with the B210.
About the network latency, do you have some reference figures about an X310? Measuring the latency in the most rough way that came up to my mind i measured a RTT of about 0.6 ms when the USRP is not transmitting/receiving nothing.
Is that a proper figure?
Thanks,
Andrea
Il mercoledì 30 agosto 2023 alle ore 18:23:20 CEST, Neel Pandeya neel.pandeya@ettus.com ha scritto:
Your CPU might not be powerful enough, or your system may not be sufficiently performance-tuned, or the MTU value is not correct for your 10 Gbps Ethernet connections (you would want to use an MTU value of 8000 or 9000). Also make sure that the two 10 Gbps Ethernet interfaces are connected correctly with the right IP addresses between the host computer and the radio.
https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks
--Neel Pandeya+1-512-683-8076 (office)
+1-512-413-5696 (mobile)
On Wed, 30 Aug 2023 at 11:15, Marcus D. Leech patchvonbraun@gmail.com wrote:
On 30/08/2023 10:57, Andrea De Jesus Torres via USRP-users wrote:
Hi everyone,
i am working with openairinterface, and i am experiencing a strange behavior with the X310 (branded USRP-2954R before flashing). When i run a code with a certain configuration file using a B210 everything works as expected, while when using an X310 i almost always end seeing a flood of LLL on the screen. That happens, for those who have familiarity with openairinterface, either running the gNB or the UE.
The X310 is flashed with the XG firmware using uhd 4.4 (but also with other 4.x versions happens the same) and connected to an Ubuntu 22.04 machine with an ethernet cable.
The USRP an the network interface are configured according to the Ettus guide https://kb.ettus.com/Getting_Started_with_4G_LTE_using_Eurecom_OpenAirInterface_(OAI)_on_the_USRP_2974
Though, with the uhd test utilities, like benchmark_rate, no issue appear.
Do you have any idea on how i could debug this situation?
Already asked the OpenAirInterface, but no reply yet.
thanks,
andrea
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com
Well, 'L' is "late packet". It's likely that the software is asking for a packet time that is too "tight" given whatever latency is
produced by your systems network stack.
OAI probably needs to investigate this.
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com