Re: [lwip-users] Receive path stuck due to pbuf_alloc returning NULL

[ercang]

Hi all, I have a similar problem. I am using FreeRTOS 9.0.0 and lwIP 2.1.0
contrib FreeRTOS port. I use a notification in ISR and send ethernet packets
to message box in ethernet input thread. Then I process those packets in
tcpip_thread(). 

I can successfully receive and send SNMP packets at 1.3 Mbps. Above this
speed, response rate to SNMP requests gradually decrease as I increase
incoming packets. After 13 Mbps, there is no answer at all. 

The problem is, even if I stop sending SNMP requests to device, I cannot
ping the device anymore. The program does not get into EMAC RX ISR. However,
it continues to execute other threads. 

I investigated the problem, and I observed that the problem happens when I
use pbuf_alloc(PBUF_POOL). If I prevent the program to get into pbuf_alloc
during the storm, and reenable pbuf_alloc after storm, I can ping the
device. 

Any help will be appreciated. 

Regards 
Ercan



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