[Discuss-gnuradio] Re: details on changing singleusrp buffer allocations

[Feng Andrew Ge]

Josh,

Thanks very much.

When I use UHD transmitting packets, after each packet, there is a "U" 
printed out. Would you tell me what "U" means?

In early GNU Radio versions, "U" means CPU underrun--GNU Radio not 
sending data fast enough to a sink, either a USRP or an audio.  But UHD 
uses UDP packets, so I cannot correlate "U" with CPU underrun.

Andrew


On 02/16/2011 12:00 PM, address@hidden wrote:
> Message: 10
> Date: Tue, 15 Feb 2011 11:59:17 -0800
> From: Josh Blum<address@hidden>
> Subject: Re: [Discuss-gnuradio] details on changing singleusrp buffer
>         allocations
> To:address@hidden
> Message-ID:<address@hidden>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Pass them in with the device arguments, just like addr, serial and the
> rest. Its just more optional key/value string pairs
>
> device_address["recv_frame_size"] = "1024"
>
> -josh
>
> On 02/15/2011 10:57 AM, Feng Andrew Ge wrote:
> > >  Could anybody please tell me how to set the following parameters?  I am
> > >  working on supporting UHD in the Python digital communication example
> > >  and hopefully I can soon share my code with the list.
> > >  
> > >      * *recv_frame_size:* The size of a single receive buffer in bytes
> > >      * *num_recv_frames:* The number of receive buffers to allocate
> > >      * *send_frame_size:* The size of a single send buffer in bytes
> > >      * *num_send_frames:* The number of send buffers to allocate
> > >      * *concurrency_hint:* The number of threads to run the IO service
> > >  
> > >  
> > >  Andrew