Hi,
I gave only a quick look at the log... I stopped at packet 167, that is
a malformed part of a TCP ECHO response sent by Xilinx board. This
message has some fields not OK: Ethernet frame type, IP version field,
and an IP service field. All of these are located in a 32bit word
starting at 0x0C from start of message, so you have an 0x40000000
instead of 0x08004500 at that location.
I could say there are some problems with multithreading and/or with your
ethernet low level driver, but you probably already checked these parts.
Maybe some other function in your system is "simply" writing a longword
in memory at the wrong place?
Don't know if this issue could be related with duplicate ACKs (surely it
is related with the "TCP previous segment not captured" at packet 168),
but I would try to resolve it first.
Enrico
On 06/11/2015 10:16, [email protected] wrote:
Hi,
My system is on a Xilinx Microblaze. I am running lwIP 1.4.0 under
FreeRTOS. I am using it in raw mode with a single tcpip thread.
I have an issue where I am getting duplicate ACKs and the connection
is failing. I am not sure what exactly is the cause but Wireshark
(attached) shows duplicate ACKs. lwIP is on port 7 @ 192.168.1.10.
I have tried different settings and get minor changes. This occurs
during a high traffic loading sequence.
I have set the lwIP task at the highest priority and it loads 95% of
the time but still occasionally gets the issue. However I don't wish
it to be the highest priority as there are more important (but with
low computational effort) tasks. When I lower it to a mid priority
task it loads maybe 5% of the time.
I have DDR memory in the system and have a large heap and have
allocated a lot of pbuf memory.
Anyone have any ideas on what might be causing my issue and
suggestions on how to fix/improve it?
Thanks,
Tim
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