[lwip-users] Problem with sending big buffers to lwip_write and semaphoresduring big downloads.

[Hans . Forsstrom]

Hello, 
I have been using LWIP in a project for a couple of months now and I think
I have been able to correct the main part of my bugs :-). We have ported
LWIP onto our own software platform, so we had some problems with the porting
layer to start with. For the moment we are running version 1.2, but I have
also tested 1.1.1 and a newer version directly from CVS. We have created
our own ethernet interface that works toward a USB CDC Subset solution,
so the problem might be with other parts of our solution.

The first problem is sending big buffers to lwip_write. If I send in a
buffer that are bigger then a ethernet frame (3000 bytes) then LWIP will
send the first buffer but my second call to write will not work. Attached
you will find a log from Wireshark running on a laptop connected via USB
to our platform. The laptop are 10.0.01 and our platform has 10.0.0.2.

The other problem is with semaphores. This is quite a small problems as
I seems to be able to work around it by streaming smaller amount of data.
Anyway, If I connect to a server and starts streaming data over TCP via
LWIP. Then everything works fine until about 100 MB of data when our platform
assert based on more calls to sys_sem_signal
then to sys_arch_sem_wait.

Have anyone had simular problems and can give me some idea on where the
problem might be? 

Thank's for the help in advance! 

BR, 
Hans

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