Re: [Discuss-gnuradio] Overflow error even at lower sampling rates

[Tom Rondeau]

On Thu, Mar 21, 2013 at 2:06 AM, john jade <address@hidden> wrote:
> Hi Marcus,
> I am not getting overflow,when i use uhd_fft. Can you please tell me what
> might be the problem.
>
> Thanks.

All uhd_fft does is connect a USRP source to an FFT sink. Problems
arise when you add more blocks to your application that take more
processing time. The more CPU intensive the task, the harder it is to
keep up with the flow of data.

Tom



> On Wed, Mar 20, 2013 at 1:10 PM, Marcus D. Leech <address@hidden> wrote:
>>>
>>> Hi,
>>>
>>> I am getting overflow error ,even at low sampling rates.I am using USRP
>>> N210 device.If the sampling rate is less than 5MHz then there is no error.I
>>> know that USRP N210 can support at Max 25MHz.Can you please tell me what
>>> might be the problem?
>>>
>>> I just connected UHD source block to FFT sink in my example.
>>>
>>> My system specifications.
>>>
>>> OS :Ubuntu 12.10
>>> processor :Intel  Core i5-3570 CPU @ 3.40GHz × 4
>>> RAM 4GB
>>>
>>> I am using 1Gbit Ethernet card.
>>>
>>>
>>> Thanks
>>
>> Overruns are caused by your computer not being able to "keep up" in real
>> time with the dataflow from the USRP.
>>
>> What happens if you use "uhd_fft" at the sames rates you're getting
>> overflow with in your simple flow-graph?
>>
>>
>>
>>
>> --
>> Marcus Leech
>> Principal Investigator
>> Shirleys Bay Radio Astronomy Consortium
>> http://www.sbrac.org
>>
>>
>>
>>
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>
>
>
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