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Netwroking problem


My application (PPC, rtems 4.8) receives data sent by PC (in this case) as UDP 
packages of 1400bytes. I have 1 second timeout set with
setsockopt (so, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv)
The PC sends data at about 800kB/s rate.

Everything works fine for an arbitrary period of time.
At some moment, my recvfrom operation exits with -1 while errno is set to 11.
Then the operation continues and the error may occur again several times.

When I check the traffic in wireshark sniffer I see that the largest interval 
between packets was about 40ms.

What is the cause of this error 11?

A lot of thanks ahead for a help.