[srsran-users] Performance issues

[Ismael Gomez]

Hi Nemo,

On Tue, 3 Oct 2023 at 10:54, <08.chancy_fantasy at icloud.com> wrote:

> Hello,
>
> I am relatively new to srslte (but not to radios and SDRs..)
>
> Already spent a couple of hours browsing / experimenting with the code and
> I must say it is very clean and well-written code.
> However, it seems that performance remains the number 1 limitation.
> Ramping up to 75 PRBs on a Xeon 2.8GHz 8-core CPU, I notice a high degree
> of instability running an iperf3 UDP DL maximum throughput test. Of course,
> the throughput degrades sharply as the instability kicks-in (usually
> triggered by an innocent looking couple of underrun packets or an RLF).
> Note that these tests were run under controlled radio conditions with a
> commercial-grade eNB / ePC.
>
> So, my first question is: can someone confirm the performance that I am
> seeing? Or is it just down to my not-so-capable platform? Is there a
> reference platform that can hit or approach maximum performance for say, 75
> PRBs (100Mbps DL / 30 Mbps UL)?
>

We probably need to tune a few parameters there. Can you share your config
files, console trace and log in warning please?


>
> Secondly, is it possible to off-load some of the heavy-lifting (turbo
> decoding e.g.) to an external device? We have an FPGA based platform that
> connects to the host via a PCI interface. Ignoring the development effort,
> my concern here is whether the cost of such off-loading (over much slower
> PCI bus and back) could already surpass the ~2ms processing window
> available..
>

We provide support for the bbdev interface to use the Intel ACC100
accelerator. But for those BW it's really not needed. Your Xeon 8-core
should be able to do 100 MHz SISO or 50 MHz MIMO without major problems
(assuming everything is optimally tuned)


>
> I have already combed through mailing list archives but could not find a
> straight answer to the above questions.
>
> Kind Regards,
> .Nemo
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>
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