Re: [Xenomai-core] preemptive doesn't work

[Roberto Bielli <roberto.bielli@domain.hid>]

Hi Gilles,

i look at the processor errata but for the imx25 there are no errata 
elements on timer.
I see that tsc uses the same timer.

Does xenomai use the tsc for the next timer period ?



Il 10/04/2012 10:45, Gilles Chanteperdrix ha scritto:
> On 04/10/2012 10:43 AM, Roberto Bielli wrote:
>> Hi Gilles,
>>
>> I don't find the end of last __ipipe_grab_irq in the trace that i send you.
>> Is it correct ?
> Yes, because the timer interrupt reschedules and wakes up the periodic
> task. I had a look at the timer programming events, it is true that the
> timer ticks more often than it should. Generally, this is an indication
> that the timer frequency is not what xenomai believe it is. xenomai idea
> of the timer frequency is given by __ipipe_mach_ticks_per_jiffy. Anyway,
> this should not cause the timer not to tick, only to tick it more often.
>
> What you should do now is try and reproduce the same conditions under an
> unpatched linux to see if you get the same phenomenon.
>
> Did you have a look a the processor errata ?
>


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