Network problem with TCP packets

Hi,
I'm using VxWorks 5.5, with a pc104 board of Ampro, and a Intel 82559
Network Interface.

I'm developing an application that sends packet at 5Hz over a TCP
socket.
I'm using two type of messages, their size are 296 and 100 bytes.
The destination is a Java application, but now I'm trying to use a C++
application too.

The message arrive correctly, I can see the values inside every struct
are ok.

But after a while(10 seconds, or 1 minutes, or 5 minutes), the system
freezes and it doesn't send any more packet.

When I send the smallest message (100 bytes), the application seems
more stable, and with a 8bytes message, it IS stable, and goes on
whitout problems.

I tried to increase the SOL_SNDBUF, until 52428 bytes (=0xcccc; I've
read that in a 20/10/1998 post), but the beheaviour remains the same.

There is no priority problem, I think: I have 98% IDLE time (I can see
that with Spy Chart). And no stack problem too...

I've checked the network memory pool: I've noticed that after a while,
the free clusters begin to running out, at first the 512-size ones,
then the 256, and so on until there are no more free clusters, and the
socket closes itself.

So, any idea or suggestion, please ?
Help!

.

Relevant Pages

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