TMS320F28386S: lwIP UDP memory link ?

Hi,

Please refer this thread 

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1074652/tms320f28388d-lwip-webserver-example-memory-errors-due-to-ethernet-descriptors-queue-management/4030084?tisearch=e2e-sitesearch&keymatch=lwip#4030084

Pls try the fix mentioned in the above thread and see if it helps.

Best Regards

Siddharth

Hi,

Thanks for the replay.
This thread has quite a few changes suggested.
would you be so kind to point me to what specific changes should I work with?

Thanks!

Hi , 

Did you try increasing the memory ? You can also check the lwip_stats to see if the memory is full.

Best Regards

Siddharth

I definitely see a memory leak.

I added numDesc as JK has on his file.

every time numDesc reaches 46, the code breaks at:

if(pktDescOrigPtr == NULL)
{
pbuf_free(p);
LINK_STATS_INC(link.memerr);
__asm(" bkpt #0");
return (ERR_MEM);

}
numDesc++;

on line 321.

Unlike JK, I am not using a webserver. only sending and receiving UDP messages.

and so, his errors and fixes are not relevant to the memory leak I see.
also, on his post, after stop getting errors, he says he also sees a memory leak.

Hi,

Can you keep looking at the lwip_stats value  (lwip_stats.mem.used) after few transmissions? Want to check if this memory used keeps on increasing or it gets reduced after successful transmission. 

Best Regards

Siddharh

See attached video.

lwip_stats.mem.used keeps increasing.

Also look at "mem_alloc_count" and "mem_free_count".

Clearly more memory is allocated then freed.

you can download the video here:

https://we.tl/t-7HV7HQzZjQ

Hi, 

I am not able to access the video since it is blocked. 

I will try to replicate the issue by running the UDP example and then get back to you. 

Best Regards

Siddharth

Hi, did you manage to replicate the problem?

Hi, 

Will get back in a couple of days. 

Best Regards

Siddharth

Hi!

I can confirm the issue using the example code with slight modification on enet_lwip_udp.c:

around line 870 in function main(), I added a simple for loop to send the generated sample pattern for the UDP message 100 times:

...

int j = 0;

...

//UDP TX block

//if (flag_TX_frame_UDP)
for (j = 0; flag_TX_frame_UDP && j < 100; j++)
{
    cnt_FFT++;
    
    ...

...and issued the 'START' message from a UDP client.

The same breakpoint in f2838xif.c mentioned above is triggered after ~10-15 minutes of operation.
the value of diff = mem_alloc_count - mem_free_count was approaching 40 when the breakpoint triggered.

Hope that helps your investigation.

Best regards,

Frank

Frank, 

Thanks for the code, will use it to recreate the problem. 

Currently held up with other tasks, hence will get back to you by next week.

Best Regards

Siddharth

Hi Siddharth!

touching base to check whether you eventually succeeded to recreate the problem.

Best regards,

Frank

Frank, 

Sorry but haven't been able to look into this issue.  There is a c2000Ware release planned this week and hence held up with it. 

Will take a look at it during the next week.

Best Regards

Siddharth

Hi Siddharth!

can I assume that the planned release of the c2000Ware went well and that you had some time to finally look into the issue? What would be your verdict?

Best regards,

Frank

Frank, 

Sorry for the delayed response on this.  Finally I was able to spend time looking into it today. 

I tried out the code with the simple for loop that you had mentioned previously and was able to reproduce the issue (hit the memory error breakpoint in f2838xif.c file)  after the code was running for about 25 mins. 

Will start debugging this issue over this week and keep you posted about my findings.

Best Regards

Siddharth 

Hello, any luck / any progress?

Hi,

Not yet, haven't been able to figure out the fix for this issue.

Will keep you posted

Best Regards

Siddharth