Hi,
I'm seeing the following issue with lwip-1.2.0 with a new port that I'm
writing.
When doing a transmit test that keeps sending out maximum sized packets out
to a host, for about 90 seconds I get consistent transmit throughput of ~ 94
Mbps. However after that tcp_write returns an error. Some more debugging
reveals that at this point, lwIP runs out of memory for allocating TCP
segments, and it fails in this line in tcp_out.c:
/* Allocate memory for tcp_seg, and fill in fields. */
seg = memp_malloc(MEMP_TCP_SEG);
I've had to increase this parameter (MEMP_NUM_TCP_SEG - # of simultaneously
queued TCP segments) all the way upto 64, but lwIP stats reports that all 64
are in use. Since I have a TCP_WND of only about 12k on host and 8k on the
board, it somehow seems incorrect that there are 64 TCP segments queued up.
Any suggestions on things I should look for in such a case? TCP Receive test
(where host sends data to the board running lwIP) works fine for over 15
minutes without any issues at the same high 94 Mbps bandwidth.
Thanks,
Siva
--
In the end, everything is a gag.
Charlie Chaplin
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