[Rtai] porting application to new system

[Paolo Mantegazza]

JB wrote:
> Hmm, did I stump everyone or am I just doing something so stupid that it 
> isn't worth discussing :)
> ??
> 

Well I've sent you a minimal Linux config that works for me SMP wise. 
Have you completed and adapted it to your machine?

When you step onto a configuration problem for a specific hardware, I 
think that is your problem, you have to play a bit with it. You have 
seen that HPET has changed the matter, but there seem to remain 
something else. Helping on such items from outside is a bit difficult. 
There is the need to have one hands on the machine to play the game.

I'll repeat try building from a simpler .config file, instead of using 
the default Linux config.

Just another suggestion disable MSI and make CONFIG_VT related items as 
in my .config, then see what happens. Once more: better start with my 
.config making it apt for your machine by just adding/changing essential 
stuff.

Paolo.

> Jared
> 
> 
> JB wrote:
> 
>> OK, I disabled everything HPET recompiled the kernel and same problem. 
>> Network connections pretty much stop responding, pings fail, and the 
>> keys on the keyboard are repeated some random number of times.  It 
>> seems to be slightly better in that I can hit the enter at the console 
>> and at least the screen scrolls.  Previously it wouldn't even respond 
>> to that.
>>
>> Is there anything else you can think of that might be causing this? 
>> While I disabled HPET, I also disabled a bunch of stuff I know we will 
>> not use on this system like: IrDA, bluetooth, 802.11 stack, hardware 
>> crypto support, etc... just some general kernel house keeping stuff. 
>> Thanks for the suggestion, it was worth a shot.
>>
>> Jared
>>
>>
>> Paolo Mantegazza wrote:
>>
>>> JB wrote:
>>>
>>>> OK, it is attached.
>>>>
>>> Try disabling HPET first.
>>>
>>> Paolo.
>>>
>>>> Paolo Mantegazza wrote:
>>>>
>>>>> JB wrote:
>>>>>
>>>>>> Thank you for the response.  Yes, I double checked the cpu in the 
>>>>>> linux kernel config.  It is a core2 processor and that is selected 
>>>>>> in the linux config and RTAI is configured to compile against the 
>>>>>> correct linux source tree.  I did read some things about 
>>>>>> calibration in the docs.  Do I need to do anything with that?  
>>>>>> Previously this app was running on a different intel x86 cpu at a 
>>>>>> different frequency.  Is that a problem? Must I recalibrate/retune 
>>>>>> this thing on the new proc?
>>>>>>
>>>>> I do not think is a matter of calibrating, that is just to slice 
>>>>> the latest us. My suspect is still there is something in your 
>>>>> configuration that must be disabled. Send your Linux config.
>>>>>
>>>>> Paolo.
>>>>>
>>>>>
>>>>>
>>>>>> Jared
>>>>>>
>>>>>>
>>>>>>
>>>>>> Paolo Mantegazza wrote:
>>>>>>
>>>>>>> JB wrote:
>>>>>>>
>>>>>>>> Hi, I have a real time application that I am porting from an 
>>>>>>>> older RTAI version on a fedora core 3 base system to RTAI 3.6 on 
>>>>>>>> fedora core 8 with a 2.6.23.0 kernel.
>>>>>>>>
>>>>>>>> I have the real time extensions installed and have run the test 
>>>>>>>> applications successfully.  I recompiled the application I am 
>>>>>>>> porting against the newer RTAI libraries and that seemed to go 
>>>>>>>> fine.
>>>>>>>>
>>>>>>>> As soon as the application I'm working with puts the system in 
>>>>>>>> hard realtime mode, strange things start happening.  For 
>>>>>>>> example, the ethernet port stops talking and all connections to 
>>>>>>>> the system are lost.   Keystrokes do not appear on the console 
>>>>>>>> very fast and when they do show up they get repeated a seemly 
>>>>>>>> random number of times even though the key was not held down.
>>>>>>>>
>>>>>>> Have you set the right CPU in Linux config?
>>>>>>>
>>>>>>> Paolo
>>>>>>>
>>>>>>>> I am hoping someone has either seen this kind of behavior before 
>>>>>>>> or understands enough about how RTAI is implemented that they 
>>>>>>>> can point me in the right direction to troubleshoot this 
>>>>>>>> problem.  Knowing or having an idea on where to start diagnosing 
>>>>>>>> this would be helpful.  Are there new timings or is there 
>>>>>>>> profiling I need to do to retune this app on this version of RTAI??
>>>>>>>>
>>>>>>>> Thanks in advance for any help you can provide!!
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> Rtai mailing list
>>>>>>>> Rtai at rtai.org
>>>>>>>> https://mail.rtai.org/cgi-bin/mailman/listinfo/rtai
>>>>>>>>
>>>>>>>
>>>>>
>>>
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