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). 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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