Hi,
I am facing a strange problem.
I am using LwIP with a TCP server (like telnet). All seems ok, but ...
After some time that I am sending request to the server and getting
replies I get the following:
tcp_receive: valid queue length
After some more send and receive I am starting to get:
tcp_write: pbufs on queue => at least one queue non-empty
It seems either not sufficient buffers and/or PCB's are defined or a
memory leak. I am not sending
lots of data and the rate is about 1 second between sending. More than
sufficient to clear all
related buffers.
After defining more PBUF's and more TCP PCB's the problem was reduced
but eventually the TCP
Is stopping to respond. I found that the code is at an endless loop at
tcp_out.c at line 937
useg->next points to useg and that causes an endless loop
I am not sure but this looks like a memory leak inside LwIP ?
Your input will be more than appreciated.
I am using the LwIP in RAW mode with the following main settings:
#define MEM_SIZE (12*1024)
#define MEMP_NUM_PBUF 100
#define MEMP_NUM_UDP_PCB 10
#define MEMP_NUM_TCP_PCB 15
#define MEMP_NUM_TCP_PCB_LISTEN 10
#define MEMP_NUM_SYS_TIMEOUT 10
#define PBUF_POOL_SIZE 20
#define PBUF_POOL_BUFSIZE 600
#define TCP_QUEUE_OOSEQ 0
#define TCP_MSS 536
#define TCP_SND_BUF (6*TCP_MSS)
#define TCP_SND_QUEUELEN (6 * (TCP_SND_BUF)/(TCP_MSS))
#define TCP_WND (4*TCP_MSS)
#define MEMP_NUM_TCP_SEG TCP_SND_QUEUELEN
BR,
Noam @ Silora R&D
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