[srslte-users] enb falling apart for n_prb>50

[Andrea Valori]

Joe,
Many thanks!
Indeed, the CPU is suffering bad time... it saturates just after starting
to stream data, but very soon after the connection drops (and therefore the
CPU goes back to low usage). I did try to check the CPU beforehand, but
probably I was missing the "spike" and therefore did not consider it as a
culprit...

Thanks for making me check more thoroughly.

Andrea



On Thu, 25 Mar 2021 at 16:00, J Giovatto <jgiovatto at adjacentlink.com> wrote:

> First off I'd check the cpu utilization at the different rates, the higher
> rates can be very demanding.
>
> Joe
>
>
> On 3/25/21 10:36 AM, Andrea Valori wrote:
>
> Dear All,
>
> I was trying to monitor the performances of the enb varying the n_prb
> parameter.
> In theory, for my understanding, the bandwidth and transfer should go UP
> increasing n_prb. This is what I see up to n_prb=50, but with 75 or 100 I
> am struggling to attach the UEs and they drop the connection very quickly
> making it impossible to conclude an iperf test...
>
> What can it be in your opinion? Tx/Rx interference? PC and/or SDR board
> performance?
>
> Something that I noticed is a weird sequence in the stout (see below): For
> n_prb<=50 the " ==== eNodeB started === " message is at the end of all the
> messages (after actual clock rate and setting frequency).
> For the n_prb=75 (and same for 100) these messages are inverted and seem
> that the eNodeB is started before setting the frequency?
> Could this be a hint of wrong timings somewhere?
>
> Cheers
>
> ---------------------------------------------------------------------------------------------------------
>
> bts at bts-ThinkPad-L460:~$ sudo srsenb --enb.n_prb 50
>
> [sudo] password for bts:
>
> ---  Software Radio Systems LTE eNodeB  ---
>
>
>
> Reading configuration file /home/bts/.config/srslte/enb.conf...
>
>
>
> Built in Release mode using commit ff84d7779 on branch fixing_enb_20_10.
>
>
>
> /home/bts/srsLTE/srsenb/src/enb_cfg_parser.cc.890: Force DL EARFCN for
> cell PCI=1 to 2525
>
>
>
> Opening 1 channels in RF device=default with args=default
>
> [INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501;
> UHD_3.15.0.0-62-g7a3f1516
>
> [INFO] [LOGGING] Fastpath logging disabled at runtime.
>
> Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
>
> [INFO] [B200] Detected Device: B200
>
> [INFO] [B200] Operating over USB 3.
>
> [INFO] [B200] Initialize CODEC control...
>
> [INFO] [B200] Initialize Radio control...
>
> [INFO] [B200] Performing register loopback test...
>
> [INFO] [B200] Register loopback test passed
>
> [INFO] [B200] Asking for clock rate 23.040000 MHz...
>
> [INFO] [B200] Actually got clock rate 23.040000 MHz.
>
> Setting frequency: DL=881.5 Mhz, UL=836.5 MHz for cc_idx=0
>
>
>
> ==== eNodeB started ===
>
> Type <t> to view trace
>
> q
>
> Stopping ..
>
> ---  exiting  ---
>
> bts at bts-ThinkPad-L460:~$ sudo srsenb --enb.n_prb 75
>
> ---  Software Radio Systems LTE eNodeB  ---
>
>
>
> Reading configuration file /home/bts/.config/srslte/enb.conf...
>
>
>
> Built in Release mode using commit ff84d7779 on branch fixing_enb_20_10.
>
>
>
> /home/bts/srsLTE/srsenb/src/enb_cfg_parser.cc.890: Force DL EARFCN for
> cell PCI=1 to 2525
>
>
>
> Opening 1 channels in RF device=default with args=default
>
> [INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501;
> UHD_3.15.0.0-62-g7a3f1516
>
> [INFO] [LOGGING] Fastpath logging disabled at runtime.
>
> Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
>
> [INFO] [B200] Detected Device: B200
>
> [INFO] [B200] Operating over USB 3.
>
> [INFO] [B200] Initialize CODEC control...
>
> [INFO] [B200] Initialize Radio control...
>
> [INFO] [B200] Performing register loopback test...
>
> [INFO] [B200] Register loopback test passed
>
> [INFO] [B200] Asking for clock rate 23.040000 MHz...
>
> [INFO] [B200] Actually got clock rate 23.040000 MHz.
>
> [INFO] [B200] Asking for clock rate 61.440000 MHz...
>
>
>
> ==== eNodeB started ===
>
> Type <t> to view trace
>
> [INFO] [B200] Actually got clock rate 61.440000 MHz.
>
> Setting frequency: DL=881.5 Mhz, UL=836.5 MHz for cc_idx=0
>
> q
>
> Stopping ..
>
> ---  exiting  ---
>
>
>
>
>
>
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