[USRP-users] problem with loopbacks when using USRP

Marcus Müller marcus.mueller at ettus.com
Tue Jul 28 12:07:37 EDT 2015

Are you running in a VM or not?

Effectively, there's nothing to solve this. If you need a specific 
application to run, and you see underruns, your computer needs to run 
faster :(

Best regards,

On 28.07.2015 18:01, Jason Matusiak via USRP-users wrote:
>> No, the U's aren't OK to ignore.  That means you're under-running on the TX side, which means missing samples.  If
>> you're getting a lot of them, it means you aren't likely getting *any* good frames over the air.
> OK, looks like I totally misunderstood that...  I was thinking that it
> meant that I the transmitter was ready to send but I hadn't prepared a
> new packet yet, which would be fine.  What is the cause/solution to the
> underrun? I tried reducing the sample rate from 10MHz to 2MHz, but I am
> still seeing occasional U's and D's. but not nearly as many as before.
> I'll play with it at this reduced rate to see if that help some, but I
> am surprised that I had to reduce it so much for an X310.
> _______________________________________________
> USRP-users mailing list
> USRP-users at lists.ettus.com
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

More information about the USRP-users mailing list