Re: USRP N210 growing latencies

[Fabien PELLET]

Hi,

Thanks for the answer.

At the moment, it seems that catching the underflow message and then 
lock/unlock the flowgraph permits to reset the buffers and is enough for 
my application to get reasonnable and not growing forever latencies. I 
don't if someone know a better way like a C++ method that could do that 
more "elegantly".

If I need more predictible latencies in the futur, indeed, I will try to 
use tags as you suggest.

Regards,

Fabien, F4CTZ.

Le 27/10/2021 à 17:02, Sylvain Munaut a écrit :
> Hi,
>
>
> > OK I understand that. But is there any solution which permits to reset that 
> > growing propagation delay ? How to reset the flowgraph buffers without killing 
> > the application and restart it ? Is there any method that permits to purge and 
> > resync buffers of the flowgraph ?
> The USRP supports timestamps for RX and TX.
> So you get tags for when data was received / is supposed to be transmitted.
> Using a custom block to modify the RX tags into TX tags ( to change
> the RX timestamps to TX timestamps a bit into the future ), you should
> be able to achieve a constant controlled latency.
>
> Cheers,
>
>      Sylvain