[srslte-users] pdsch_enodeb gives underrun errors on X300

Jasuja, Ishwar Ishwar.Jasuja at spirent.com
Fri Jun 10 15:22:30 UTC 2016


I will give that a try today. I am using that X300 box for 802.11 PHY on very same PC. So I am not suspecting that box at the moment. That is when I thought srsLTE might be expecting a diff version of UHD API than what I have on that PC.

Thanks,
Ishwar

From: Ismael Gomez [mailto:ismael.gomez at softwareradiosystems.com]
Sent: Friday, June 10, 2016 7:59 AM
To: Jasuja, Ishwar; srslte-users at lists.softwareradiosystems.com
Subject: Re: [srslte-users] pdsch_enodeb gives underrun errors on X300

Yes that is true, but you should be able to transmit a signal even if sampling rate is not ok. And if you don't get underruns, it means the problem is with the X300

On Fri, 10 Jun 2016 at 16:48 Jasuja, Ishwar <Ishwar.Jasuja at spirent.com<mailto:Ishwar.Jasuja at spirent.com>> wrote:
I have N210 box but I read somewhere that it does not have the sampling rate support that srsLTE looks for.

Thanks,
Ishwar

From: Ismael Gomez [mailto:ismael.gomez at softwareradiosystems.com<mailto:ismael.gomez at softwareradiosystems.com>]
Sent: Friday, June 10, 2016 1:35 AM

To: Jasuja, Ishwar; srslte-users at lists.softwareradiosystems.com<mailto:srslte-users at lists.softwareradiosystems.com>
Subject: Re: [srslte-users] pdsch_enodeb gives underrun errors on X300

Do you have access to a B210, an N210 or a bladeRF to check against? Just to make sure that it is not a problem with the PC...

On Fri, 10 Jun 2016 at 00:35 Jasuja, Ishwar <Ishwar.Jasuja at spirent.com<mailto:Ishwar.Jasuja at spirent.com>> wrote:
I have made sure that:

VOLKS is available on the system as I see following debug message when I launch the process.
               Using Volk machine: avx2_64_mmx_orc

I have disabled freq scaling on all (8) cores using following command.
          "echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"

There is nothing else running on the machine.

I don’t know if this matters but I am using version 2.0 of UHD (host) drivers which is the latest.

Thanks,
Ishwar

From: Ismael Gomez [mailto:ismael.gomez at softwareradiosystems.com<mailto:ismael.gomez at softwareradiosystems.com>]
Sent: Thursday, June 09, 2016 1:50 PM
To: Jasuja, Ishwar; srslte-users at lists.softwareradiosystems.com<mailto:srslte-users at lists.softwareradiosystems.com>
Subject: Re: [srslte-users] pdsch_enodeb gives underrun errors on X300

Hi Ishwar,

This could be a CPU processing problem, make sure that:
- VOLK is available in the system and is detected by cmake
- CPU frequency scaling is disabled and fixed to a maximum
- No other processes are using the CPU

Thanks,
Ismael

On Thu, 9 Jun 2016 at 10:45 Jasuja, Ishwar <Ishwar.Jasuja at spirent.com<mailto:Ishwar.Jasuja at spirent.com>> wrote:
Hi,

I am trying to run pdsch_enodeb test program  and getting underrun errors. I am using latest host software for X300 ; rev 2.0. The X300 box has latest FPGA image installed on it.
I have tried various values of Number of PRBs (i.e. diff sampling rates) but no luck. I am running on x86 machine that has CPU with AVX support.

Note:  Tx_samples_c programs in USRP code seems to work fine.

Thanks,
Ishwar



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