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From: | Shemesh mimran, Nir [BWIIL] |
Subject: | [lwip-users] LWIP 2.0.2 / Xilinx Zynq: TCP hang data transmission after packets loss events |
Date: | Thu, 7 Apr 2022 17:52:31 +0000 |
Hi LWIP, I hope this is the relevant list to ask about an issue I’m working on for a while. My setup as follow:
Connectivity between the units is fiber – and I added sniffer in the middle for debugging of the issue. Unit A transmit in TCP (LWIP 2.0.2) data at around 1.7[Mbps] to unit B. The problem: after hour of system running the throughput is dropped to zero (except of TCP keep alive) and return back after around 6 seconds. After reviewing the wireshark in the middle (connected via sniffer) I found a 3 dup acks event that cause fast retransmission reply, From that moment the Application traffic stopped for 6 seconds and only TCP keep alive was active. After checking the location of the packet loss I can tell for sure it was in the PC side (runnin Iperf UDP test client /server locally shows some packet loss due to the load on the
PC). I attached two wiresharks files of two events. Now my question are:
Any help here will be much appreciated. Kind regards, Nir Shemesh System Engineer
P.O. Box 275 Yokneam 2066717 Israel T:
+972-(0)4-813-6114 M:
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Event_1.pcapng.gz
Description: Event_1.pcapng.gz
Event_2.pcapng.gz
Description: Event_2.pcapng.gz
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