[srslte-users] pdsch_enodeb gives underrun errors on X300

Ismael Gomez ismael.gomez at softwareradiosystems.com
Fri Jun 10 14:58:58 UTC 2016


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>
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]
> *Sent:* Friday, June 10, 2016 1:35 AM
>
>
> *To:* Jasuja, Ishwar; 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>
> 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]
> *Sent:* Thursday, June 09, 2016 1:50 PM
> *To:* Jasuja, Ishwar; 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>
> 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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