Re: [ECOS] CYGNUM_HAL_RTC_PERIOD

[Dirk Husemann <hud@zurich.ibm.com>]

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vasantha.rajan wrote:

>On Tuesday 21 February 2006 15:09, you wrote:
>
>Hi Dirk ,
>
>Thanks for your reply......
>
>In my previous mail I asked one more question.....but did'nt get reply.
>
>
>  
>
[...]

>         
> 1. I made  CYGNUM_HAL_RTC_DENOMINATOR to 100000, (so that my
> clock will trigger for 10us) and in my code if i initialize my alarm to
>cyg_alarm_initialize( alarm_hdl, 100000 + cyg_current_time(), 0 ), my alarm
> triggered for every 1 sec.
>
> If I reduce my value given to cyg_alarm_initialize() API to 10000 my alarm 
>triggered for every 0.1 sec ie, my code
> count value increments to 10 for every second and still if reduce my value
> to 1000 count value increments to 100 for every second,but if I still
> reduce my value to 100 ,I expected the count value should increment to
> 1000,but the count value increments upto some 350 approx.
>
> and if i still reduce my value to 10 or 1 my count only increments to 350
> only...why I am not getting the linear increment?????????
>  
>
my suspicion is that your system is increasingly busy/overloaded with 
doing interrupts and doesn't have enough cycles left to work through 
your thread's code...or in other words: you are using up your system's 
resources with servicing/trying to service the timer interrupts and you 
have no resources left for pretty much anything else.


-- 
Dr Dirk Husemann, Pervasive Computing, IBM Research, Zurich Research Lab
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