This is a Xilinx driver, right? Have you read this (also Xilinx):
http://lists.nongnu.org/archive/html/lwip-devel/2017-12/msg00070.html
It seems that they have fixed problem mentioned in this thread in the
newest version of port for lwip, specifically in file xemacpsif_dma.c.
However, I was using older version of this file, and it seems there was
a problem all the time.
Eveything - throughput + connections - seem OK now when I switched to
latest version of this file.
Thank you guys,
Nenad
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