Re: [Xenomai-help] sock_sendmsg() causes crash

[Jan Kiszka <jan.kiszka@domain.hid>]

Alphan Ulusoy wrote:
> Hi all,
> 
> I' am trying to send small UDP datagrams in a real-time system. I can't
> get a satisfactory performance when I send these packets from a
> userspace Xenomai task using sendto() call.
> 
> That's why I tried to code a small kernel module to make some
> measurements. However; whenever
>     • A xenomai task
>     • An alarm function
>     • A thread created with kthread_run() form a xenomai task
> that includes the sock_sendmsg() call runs, system crashes. However, if
> a write a regular kernel module, the it works just fine...
> 
> Below you can find the code and the crash dump.
> 
> Does anyone have any suggestions? Is there any other way that I can send
> a UDP packet from a kernel Xenomai task?

I think Philippe already suggested that you should start reading a bit
about the co-kernel model and its implications.

Also, you may want to look at RTnet if you have to send UDP packets
under RT constraints.

Jan

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