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From: Roberto Bielli <roberto.bielli@domain.hid>
To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-core] preemptive doesn't work
Date: Tue, 10 Apr 2012 14:58:39 +0200	[thread overview]
Message-ID: <4F842E7F.5000208@domain.hid> (raw)
In-Reply-To: <4F842934.8090503@domain.hid>

In the xenomai example the task periodic is 2ms not 200us. ( 
rt_task_sleep( 2ms 000us 000ns ) );
And the 10ms is because the default system time period of the timer 
without xenomai is ~10ms.
So a process that execute in linux base can be re-scheduled only when 
the timer generate an interrupt , the task makes I/O, or sleeps.



Il 10/04/2012 14:36, Gilles Chanteperdrix ha scritto:
> On 04/10/2012 02:33 PM, Roberto Bielli wrote:
>> Il 10/04/2012 13:49, Gilles Chanteperdrix ha scritto:
>>> On 04/10/2012 12:39 PM, Roberto Bielli wrote:
>>>> Hi Gilles,
>>>>
>>>> i tried your code but th behavior is the same.
>>>>
>>>> Then i tried a linux base app and works correctly.
>>> In the exact same conditions? With the crunching task running with
>>> SCHED_FIFO, priority 1, and the periodic task running with SCHED_FIFO,
>>> priority 99, and the linux real-time throttling disabled?
>>>
>> Yes, and i see that every LATCH ( about ~10ms ) period the task with
>> higher priority is wakeup.
> In the example you sent the periodic task was running with a 200us
> period, not 10ms.
>


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  reply	other threads:[~2012-04-10 12:58 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-02 10:42 [Xenomai-core] Xenomai server down Gilles Chanteperdrix
2012-03-06  7:55 ` [Xenomai-core] preemptive doesn't work Roberto Bielli
2012-03-06  9:22   ` Gilles Chanteperdrix
     [not found]     ` <4F55E390.8090706@domain.hid>
2012-03-06 12:09       ` [Xenomai-help] " Gilles Chanteperdrix
2012-03-06 13:00         ` Roberto Bielli
2012-03-06 13:04           ` Gilles Chanteperdrix
2012-03-06 15:14             ` Roberto Bielli
2012-03-06 15:20               ` Gilles Chanteperdrix
2012-03-06 15:35                 ` Roberto Bielli
2012-03-06 16:16                   ` Gilles Chanteperdrix
2012-03-07 12:59                     ` Roberto Bielli
2012-03-07 13:44                       ` Gilles Chanteperdrix
2012-03-07 18:13                         ` Roberto Bielli
2012-03-13 10:45                           ` [Xenomai-core] Fwd: " Roberto Bielli
2012-03-13 11:44                           ` [Xenomai-core] " Gilles Chanteperdrix
2012-03-13 12:10                             ` Gilles Chanteperdrix
2012-04-04  9:21                           ` Gilles Chanteperdrix
2012-04-04  9:29                             ` Roberto Bielli
2012-04-04  9:45                               ` Gilles Chanteperdrix
2012-04-06 15:35                                 ` Roberto Bielli
2012-04-06 15:40                                   ` Gilles Chanteperdrix
2012-04-06 16:59                                     ` Roberto Bielli
2012-04-07 22:17                                       ` Gilles Chanteperdrix
2012-04-10  8:18                                         ` Roberto Bielli
2012-04-10  8:22                                           ` Gilles Chanteperdrix
2012-04-10  8:43                                         ` Roberto Bielli
2012-04-10  8:45                                           ` Gilles Chanteperdrix
2012-04-10  8:58                                             ` Roberto Bielli
2012-04-10  9:00                                               ` Gilles Chanteperdrix
2012-04-10  9:06                                               ` Gilles Chanteperdrix
2012-04-10  9:11                                                 ` Gilles Chanteperdrix
2012-04-10  9:21                                                   ` Roberto Bielli
2012-04-10  9:27                                                     ` Gilles Chanteperdrix
2012-04-10  9:37                                                     ` Gilles Chanteperdrix
2012-04-10 10:39                                                       ` Roberto Bielli
2012-04-10 11:25                                                         ` Gilles Chanteperdrix
2012-04-10 12:05                                                           ` Roberto Bielli
2012-04-10 12:06                                                             ` Gilles Chanteperdrix
2012-04-10 12:11                                                               ` Roberto Bielli
2012-04-10 12:12                                                                 ` Gilles Chanteperdrix
2012-04-10 12:18                                                                   ` Roberto Bielli
2012-04-10 11:49                                                         ` Gilles Chanteperdrix
2012-04-10 12:33                                                           ` Roberto Bielli
2012-04-10 12:36                                                             ` Gilles Chanteperdrix
2012-04-10 12:58                                                               ` Roberto Bielli [this message]
2012-04-10 15:55                                                                 ` Gilles Chanteperdrix
2012-04-10 12:40                                                             ` Gilles Chanteperdrix
2012-04-11  6:59                                                               ` Roberto Bielli
2012-04-11 11:59                                                                 ` Gilles Chanteperdrix
2012-04-11 12:10                                                                 ` Gilles Chanteperdrix
2012-04-12 10:12                                                                   ` Roberto Bielli
2012-04-12 16:58                                                                     ` [Xenomai-core] porting xenomai on imx25 Roberto Bielli
2012-04-12 17:40                                                                       ` Gilles Chanteperdrix
2012-04-13  8:44                                                                         ` Roberto Bielli
2012-04-13 13:47                                                                           ` Gilles Chanteperdrix
2012-04-18  8:44                                                                             ` Roberto Bielli
2012-04-18  9:19                                                                               ` Gilles Chanteperdrix
2012-04-18 10:28                                                                                 ` Roberto Bielli
2012-04-18 11:51                                                                                   ` Gilles Chanteperdrix
2012-04-19  8:52                                                                                     ` Roberto Bielli
2012-04-19  8:54                                                                                       ` Gilles Chanteperdrix
2012-04-19  9:01                                                                                         ` Roberto Bielli
2012-04-19  9:02                                                                                           ` Gilles Chanteperdrix
2012-04-19 12:11                                                                                             ` Gilles Chanteperdrix
2012-04-12 17:32                                                                     ` [Xenomai-core] preemptive doesn't work Gilles Chanteperdrix
2012-04-10 12:52                                                             ` Gilles Chanteperdrix
2012-04-10  9:19                                                 ` Roberto Bielli
2012-04-10  9:19                                                   ` Gilles Chanteperdrix

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