[USRP-users] E310 Rx Timeout with higher sampling rates

Philip Balister philip at opensdr.com
Thu Apr 30 18:02:33 EDT 2015


On 04/30/2015 02:45 PM, Voss, Nathan J via USRP-users wrote:
> I am in the process of porting code that was built and tested successfully on a USRP N200 to a USRP E310. The sampling rate is user-configurable, and we really need to support as large a bandwidth as possible. On the N200, my code worked fine for sampling rates up to ~15Msps, but on the E310 the same code is struggling to run over about 500Ksps. 
> 
> When I set the sampling rate on the E310 above about 500Ksps, I initially get one or two 'O' overflow notifications, and then start to get timeout errors very frequently. My code is fairly simple, in that I'm calling 'usrp->recv()' in a pretty tight loop, very similar to the 'rx_samples_to_file' example. The timeout value I'm passing into the recv() call is currently 3.0 seconds, and my 'nsampls_per_buf' is typically 512.

Also, try running "perf top" to get an idea where the hotspots are.

The slides from Mans talk at ELC 2015 might be helpful with perf:

http://elinux.org/images/7/7e/Performance_Analysis_Using_the_perf_Suite.pdf

Philip

> 
> Thanks for your help.
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