Re: [RTnet-developers] Ethernet IP

[Glen W. <gl...@je...>]

Jan,

The project I am trying to make real time is:
http://sourceforge.net/projects/opener/

It is hard to give a test case because my other side of this is an Allen
Bradley controller. This project does work in standard Linux but then I have
to deal with OS latencies from the card to my real time program.

Here is my current thought. The code as written in your example works. If I
run accept() before select, accept() always returns the same file descriptor
as was put it. Is this a a limitation of RTNET?

Also, it appear that select() without accept() and you can read()
successfully.

I can probably work around the above.

Now I need to focus on why Send or Write  are "oops"ing.

The only difference between my code and your example is that I am not
setting the same socket options SO_KEEPALIVE and SO_SNDTIMEO. I will try
these this mourning.

The only other reason this could be "oops"ing is that I am reading and
writing on the same socket and your example does not.

I will let you know.

Glen

P.S. At least now I know I can go back to RTAI if I want. The rest of our
project works in RTAI.




On 2/8/11 7:24 AM, "Jan Kiszka" <jan...@we...> wrote:

> On 2011-02-08 13:18, Glen Wernersbach wrote:
>> I used select with a timeout. Select seems to work. It returns a positive
>> number and a fdset.
>> 
>> It is accept which does not seem to work in taking off the top packets and
>> send or write oopses the machine.
>> 
>> Accept does seem to work if I run it before select.
> 
> Given that this is not the pattern we tested so far (actually, the whole
> server side TCP implementation was only "for fun", real use cases were
> only clients so far) nor is it supposed to work based on the existing
> logic, you may have triggered a BUG path.
> 
>> 
>> We can try the example but then I have to set up another machine.
> 
> Or provide your test for local reproduction.
> 
>> 
>> Could any of thus be e1000 driver?
> 
> Test via rtlo instead.
> 
> Jan
> 

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