Re: [lwip-users] Dropped UDP packages

[Andrew Foster]

Emil,

I've had to debug a similar event on my target and found it helpful to 
get familiar with stats.c. The various compiler switches can be found in 
lwipopts.h(sounds like you are already aware of UDP_STATS.) More 
specifically, look in to MEM, MEMP, PBUF and SYS stats. Verify you don't 
have any errors in these paths before getting down and dirty with your 
ISR. I know the Luminary/TI ISR has some flaws but hopefully your target 
platform's ISR has been implemented correctly.

Hope this helps,

Andrew



On 08/18/2011 08:59 AM, Emil Ohlsson wrote:
> Hi!
>
> I'm writing and application that listens for RTP-packages via UDP multicast. 
> But for some reason there is a small package drop, say 1 per 1000 packets.
>
> I've activated UDP stats and it seems like lwIP doesn't think there are any 
> dropped packets, but from my application I can see that there are missing 
> sequence numbers. And I can see that those packages are being sent using 
> wireshark.
>
> Does lwIP discard packages if the application isn't fast enough to fetch them? 
> Could there be any other thing I've missed? Could there be some memory issue? 
> Any comments or ideas are very welcome
>
> Best regards
> Emil Ohlsson
>
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