Re: [Discuss-gnuradio] Why am I dropping data over the UDP network?

[Marcus Müller]

Hi Marcus,
On 14.07.2014 22:01, Ward, Marcus D. wrote:
> The UDP sink doesn't support complex int 16, so what would I be able to 
> change the type to in order to come to a close solution for this problem? 
It should, using the datatype "short".
>
> Also, I have lowered the sample rate to very small amounts such as 1e6, but I 
> still lose packages on the receiving end. There is a 1-gigabit switch between 
> the two USRP's, so it is a very simple network. I don't think the network is 
> the problem.
I tend to agree, but dropped data indicates that either end (presumably
the receiving one) is having trouble getting the data out of the UDP
source fast enough.

>
> -----Original Message-----
> From: address@hidden [mailto:address@hidden On Behalf Of Marcus Müller
> Sent: Friday, July 11, 2014 8:59 PM
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] Why am I dropping data over the UDP network?
>
> No, building vectors out of streams would (in the best case) change nothing, 
> as you don't send individual samples but always packets full of payloads.
>
> Also, if you have a hardware device defining your data rate, you will never 
> need a throttle, and having one will most likely only introduce problems, so 
> remove it from your flowgraph. All throttle really does is trying to achieve 
> a given *average* sample processing rate, and that interferes with the 
> hardware *constantly* providing a sample rate.
>
> A few numbers in my head: 500ksps = 500 * 32kbps = 16000kbps, not very much 
> for a gigabit ethernet! So I think it's safe to assume that the physical 
> network is not to blame here, and usually the CPU load, maybe introduced by 
> network handling might be to blame, if this doesn't happen with a null sink.
>
> Greetings,
> Marcus
>
>
> On 11.07.2014 19:49, madengr wrote:
>> Funny that I was doing the exact same thing last night, and I'm also 
>> getting warnings on the receive end at only 500 ksps on a home LAN.
>>
>> Should the stream be vectorized before the UDP sink, and if so how 
>> long?  I tried both stream and vectors but still get the warnings.
>>
>> Lou
>> KD4HSO
>>
>>
>> Ward, Marcus D. wrote
>>> Hey Everyone,
>>>
>>> I am sending a signal from one USRP to another USRP through a UDP network.
>>> It seems to work but I am getting data loss as gnu-radio runs the 
>>> flow graph. Hopefully someone could help me with this problem?
>>>
>>> P.S. I have the sender side (RecieveStation.jpg) and the 
>>> Reciever/Display side (RecieveDisplay.jpg) attached
>>
>>
>>
>> --
>> View this message in context: 
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>> twork-tp49283p49286.html Sent from the GnuRadio mailing list archive 
>> at Nabble.com.
>>
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