[USRP-users] [B210] ERROR_CODE_TIMEOUT when recv_frame_size > 8184

Jason Roehm jasonr at 3db-labs.com
Fri Feb 8 15:52:13 EST 2019


Ron,

Can you elaborate on what the changes you referenced are and their consequences? In my past experience, increasing the frame size has been critical to achieving full-rate throughput on the B200 series.

Jason

> On Feb 8, 2019, at 3:45 PM, Ron Economos via USRP-users <usrp-users at lists.ettus.com> wrote:
> 
> The recv_frame_size behavior has been changed in UHD after v3.13.0.3-rc1. If you want to experiment with large frame sizes, you have to go back to v3.13.0.3-rc1 or before.
> 
> Ron
> 
> On 2/8/19 03:23, Krzysztof Wisniewski via USRP-users wrote:
>> Dear users, 
>>  
>> I’m new to Ettus SDR therefor I might be missing some basic knowledge. However I’ve read that in order to increase RX capture performance I should fiddle with recv_frame_size and num_recv_frames. While increasing the latter parameter gives good results, increasing recv_frame_size gives me ERROR_CODE_TIMEOUT. I’ve went through the UHD code and it seems that my version of USRP should support values <n a range of <40; 16360>. Could someone explain why I’m getting those errors?
>>  
>> My UHD version: linux; GNU C++ version 7.3.0; Boost_106501; UHD_3.14.0.HEAD-0-gd20a7ae2
>>  
>> I’m using rx_to_file.py, this is the command I’m using:
>>  
>> sudo nice -21  python rx_to_file.py --args recv_frame_size=8192, num_recv_frames=256,serial=317B9F8 --output-file /home/odroid/shared/rx_captured.txt --freq 2440e6 --rate=45e6 --duration 0.1
>>  
>> I’ve tried it on B205mini-I with the same result.
>>  
>> Regards,
>> Kris
>>  
>> 
>> 
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