Hello Cedric,

This information is listed in the manual for error/problem troubleshooting)
[1]

The "D" is a dropped packet on reception, and shows up as an indication of
a sequence error caused by an overflow on networked devices. [2]

The "S" is a sequence error on transmission.

The possible causes of such problems are also listed in [1].

Cheers,
- Nicolas

[1]
https://files.ettus.com/manual/page_usrp_x3x0_config.html#x3x0cfg_hosthw_troubleshooting
[2]
https://files.ettus.com/manual/page_general.html#general_ounotes_overflow

On Tue, Apr 3, 2018 at 9:47 AM, Cedric Roux via USRP-users <
usrp-users@lists.ettus.com> wrote:

> On 04/03/18 00:45, Martin Braun via USRP-users wrote:
>
>> If you're on 3.11.* or later, then you can use
>> -DUHD_LOG_FASTPATH_DISABLE to disable the printing of UOSDL. If you want
>> to know about U, S and L events, then use recv_async_msg() as you're
>> already doing. If you want to know about O and D events, then check the
>> rx_metadata from recv().
>>
>> Cheers,
>> Martin
>>
>
> Thanks Martin.
>
> Just to recap (the documentation is vague, or I did not find the
> correct URL):
> - L: late packet on TX, I send a packet to the device with a timestamp
>      in the past
> - U: underflow: there is a TX stream running but the application
>      did not send data for time T=now
> - S: what is it?
> - O: overflow: there is too much data in RX buffers, the device
>      cannot put new samples because the application did not
>      get the data in the buffers yet
> - D: what is it?
>
> I don't understand S and D. I hope I'm correct for the others.
>
> Thanks.
>
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