[lwip-devel] [bug #59349] TCP Memory Issues

[Dave Smith]

Follow-up Comment #1, bug #59349 (project lwip):

After doing some further investigation work I have found the issue appears to
be linked to TCP_WRITE_FLAG_MORE and TCP_WRITE_FLAG_COPY.

In my original project I chose to use the TCP_WRITE_FLAG_MORE as I wish to
control the devices memory (I would like to keep MEM_SIZE as low as
possible.)

If I change my tcp_write function to do a mem copy with the
TCP_WRITE_FLAG_COPY and assign addition memory, I no longer get tcp_write
memory errors. I also notice my queue len only increased by 1 when I call
tcp_write with the copy flag as oppose to the increase by 2 noted in my
original bug report.

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