When I received heavy bursty data (10MB per burst) using TCP in LwIP
everything blocked.
The problem appears to be the following one:
when an api_msg gets lost (no more available elements in memp)
the window is not updated through tcp_recved (called by do_recv in api_msg.c).
Thus the tcp window reaches zero size and everything is blocked.
Here is my workaround for the tcpip.c file for delaying the
api msg instead of loosing it.
#define API_MSG_RETRY_DELAY 10
void
tcpip_apimsg(struct api_msg *apimsg)
{
struct tcpip_msg *msg;
msg = memp_malloc(MEMP_TCPIP_MSG);
/*if (msg == NULL) {
memp_free(MEMP_API_MSG, apimsg);
return;
}*/
while (msg == NULL) {
sys_msleep(API_MSG_RETRY_DELAY);
msg = memp_malloc(MEMP_TCPIP_MSG);
}
msg->type = TCPIP_MSG_API;
msg->msg.apimsg = apimsg;
sys_mbox_post(mbox, msg);
}
renzo
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