Max messages in Message Queue

[Aleix Conchillo Flaqué]

On Tue, Jun 16, 2009 at 09:20, Samuel Bitton<S.Bitton at sstl.co.uk> wrote:
> It cannot be too many queues as I can create the queue ok with 100
> messages in it.
> Note that I get the error when I call create with 500 messages.
> Also note that I don't think it is a memory issue as for 100 messages
> the message size is set to 33 bytes and for the 500 messages case, I set
> the message size to 5 bytes only. So in theory this would require as
> much memory (unless RTEMS uses a lot of overhead on a per message
> bases).
>
> So to me there is a limiting factor for the number of messages per
> queue?
>

I'm not sure if this will be the problem, but if you are running 4.7
or older you might need to setup CONFIGURE_MEMORY_OVERHEAD which adds
space in the workspace for message queue buffers. Buffers are not
taken into account when reserving memory for message queues.

Aleix