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[lwip-users] PBUF starvation

From: Alexandre Malo
Subject: [lwip-users] PBUF starvation
Date: Tue, 28 Jul 2009 13:42:56 -0400

  I am having PBUF starvation. After a time, some PBUF isnt freed and will never be. I believe, after debuging and adding trace to the pbuf file that it is cause by the TCP_INPUT function. I'm using TCPIP thread.
Im keeping a list of allocated pbuf pointer with a time of allocation.
With this list I found that many PBUF were not freed and remain allocated. All the threads are running correctly.
I think the problem is located in TCP_INPUT. When the mbox of TCP thread is full, the pbuf isn't freed.  Should the PBUF be freed there or should it be my FEC port that free the pbuf?
  struct tcpip_msg *msg;
  if (mbox != SYS_MBOX_NULL) {
    msg = memp_malloc(MEMP_TCPIP_MSG_API);
    if (msg == NULL) {
      return ERR_MEM;
    msg->type = TCPIP_MSG_CALLBACK;
    msg->msg.cb.f = f;
    msg->msg.cb.ctx = ctx;
    if (block) {
      sys_mbox_post(mbox, msg);
    } else {
      if (sys_mbox_trypost(mbox, msg) != ERR_OK) {
        // FREE THE PBUF HERE??? //
        memp_free(MEMP_TCPIP_MSG_API, msg);
        return ERR_MEM;
    return ERR_OK;
  return ERR_VAL;

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