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
progress_fail.pcapng
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