Re: Latency problem in rtai-4.0 with kernel 3.5.7

Hi Paolo,

Ok,But why i got undeterministic behavior in my application.suddenly i 
got 3-5 sec delay even it is hard real time.

-- 
Thanks & Regards,

*Sameer Zungare*
+91 9021918228
*/iASYS/*
*Product Development Center*
401 A/2, Nano Space
Baner-Pashan link road, Baner
Pune 411045, India
Ph. +91 96234 47255 ext. xxx
www.iasys.co.in

__
On 04/06/2016 1:53 PM, Paolo Mantegazza wrote:
> On 04/06/2016 09:27 AM, Sameer wrote:
>> Hi Paolo,
>>
>> yes,in our application we used start_rt_timer() call.There are 4 real 
>> time tasks with different priorities 1,5,6,7.
>>
> Then when you start your application there is a timer reset and what 
> is running already will be stalled for a while, so the overruns. 
> Therefore what is important is that the overruns number does not 
> change after the timer has been restarted.
> That's one of the reason for which in 5.0 hard timer initializations 
> by users are muted and the timer managed directly just by the 
> scheduler, in oneshot mode only.
> Paolo--
>> Thanks & Regards,
>>
>> *Sameer Zungare*
>> +91 9021918228
>> */iASYS/*
>> *Product Development Center*
>> 401 A/2, Nano Space
>> Baner-Pashan link road, Baner
>> Pune 411045, India
>> Ph. +91 96234 47255 ext. xxx
>> www.iasys.co.in
>>
>> __
>> On 04/06/2016 12:46 PM, Paolo Mantegazza wrote:
>>> Does your application do start_rt_timer? Does your application  have 
>>> tasks at priority 0?
>>> Paolo
>>>
>>> On 04/06/2016 07:27 AM, Sameer wrote:
>>>> hi Paolo,
>>>>     Thanks for reply.
>>>>
>>>>     i run latency test alone. it shows overrun count 0 but whenever 
>>>> i load my application overrun start to increment.
>>>>
>>>>     Please find attached latency test result.
>>>>
>>>> -- 
>>>> Thanks & Regards,
>>>>
>>>> *Sameer Zungare*
>>>> +91 9021918228
>>>> */iASYS/*
>>>> *Product Development Center*
>>>> 401 A/2, Nano Space
>>>> Baner-Pashan link road, Baner
>>>> Pune 411045, India
>>>> Ph. +91 96234 47255 ext. xxx
>>>> www.iasys.co.in
>>>>
>>>>
>>>> On 04/05/2016 8:36 PM, Paolo Mantegazza wrote:
>>>>> You should run the latency test alone and check if the 4 ms 
>>>>> latency appears periodically.
>>>>> Paolo
>>>>>
>>>>> On 04/05/2016 04:49 PM, Sameer wrote:
>>>>>> hi,
>>>>>>
>>>>>> Please find attached latency test result.
>>>>>>
>>>>>> Iam facing latency problem in my real time application.I have 4 
>>>>>> real time task exucting in user space at 10ms & one kernel module 
>>>>>> task which is executing at 1ms.
>>>>>>
>>>>>> my application is randomly stuck for 2-3 sec. sometimes greater 
>>>>>> than this also. simulataneously i run latency test it also shows 
>>>>>> overruns count more than 200.it is not deterministic behaviour.
>>>>>> my current machine has below configuration
>>>>>>
>>>>>> 1.Ubunbtu-12.04
>>>>>> 2.RTAI-4.0
>>>>>> 3.kernel 3.5.7
>>>>>> 4.Cpu core -Intel Pentium 4.
>>>>>> 5.Timer-tsc.
>>>>>> 6.No. of core-1.
>>>>>>
>>>>>> The same applications work deterministic in my older system which 
>>>>>> has kernel 2.6.23 & rtai-3.9 & centos distro with same PC.
>>>>>>
>>>>>>
>>>>>> Is there any problem with kernel or rtai or ubuntu or kernel 
>>>>>> configuaration?
>>>>>>
>>>>>> Please let me know any solution for this problem.
>>>>>> -- 
>>>>>> Thanks & Regards,
>>>>>>
>>>>>> *Sameer Zungare*
>>>>>> +91 9021918228
>>>>>> */iASYS/*
>>>>>> *Product Development Center*
>>>>>> 401 A/2, Nano Space
>>>>>> Baner-Pashan link road, Baner
>>>>>> Pune 411045, India
>>>>>> Ph. +91 96234 47255 ext. xxx
>>>>>> www.iasys.co.in
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>
>

_______________________________________________
Rtai mailing list
[email protected]
https://mail.rtai.org/cgi-bin/mailman/listinfo/rtai