Well, just maybe I have succeeded to find the solution to this
problem... However, since I don't know exactly how TCP works under the
hood, maybe I could cause some other problems, but for now it's working.
Nevertheless, I decided to reduce TCP MSS from 1460 to 1446, and
ip_frag() is not called any more at all. At least, not so far, I have
been testing the whole night, so that's good starting point.
I would be grateful if someone could explain me whether this change is
valid, I mean, if that's not something I should be changing (reducing)
for some reason?
On 6.3.2017 11:09, pekez wrote:
I forgot to mention that I use Xilinx lwIP example applications (XAPP
1026
<https://www.xilinx.com/support/documentation/application_notes/xapp1026.pdf>).
Basically the only thing I have changed is in their TCP server app,
instead of only receiving data, I made server only to send data
(literally, instead of lwip_recv, I put lwip_send).
Also, I don't know whether this means anything, but bug reproduction
is kinda interesting. I am always able to bring up TCP client several
consecutive times and successfully exchange data (ip_frag never gets
called during the exchange) and close TCP client. Then I don't do
anything for about 5-10 minutes. Then I bring up TCP client again, and
TCP server get stuck in ip_frag() when start sending data.
On 6.3.2017 10:57, pekez wrote:
1) netif->mtu = XEMACPS_MTU - XEMACPS_HDR_SIZE;
#define XEMACPS_MTU 1500U /* max MTU size of Ethernet
frame */
#define XEMACPS_HDR_SIZE 14U /* size of Ethernet header */
2) how can I check exact length of pbufs?
3) Yep, IP_FRAG_USES_STATIC_BUF and LWIP_NETIF_TX_SINGLE_PBUF are
both 0.
Thanks!
On 6.3.2017 10:51, Simon Goldschmidt wrote:
pekez wrote:
Anyone? Not a single person can tell me something about this problem?
Does not seem so.
Could you give us more info:
- what is netif->mtu set to
- exact length of pbufs in a chaing > 1480
- setting of IP_FRAG_USES_STATIC_BUF and LWIP_NETIF_TX_SINGLE_PBUF
(I assume both are 0 - default)
That way I could try to have a quick look.
Simon
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