From: Johann Obermayr <johann.obermayr@sigmatek.at>
To: Xenomai@xenomai.org
Subject: [Xenomai] usage of rtdm_task_sleep_abs
Date: Thu, 09 Jul 2015 14:15:55 +0200 [thread overview]
Message-ID: <559E65FB.8080904@sigmatek.at> (raw)
Hello,
we have follow situation
u64 lrtdrv_time_of_irq_ns ;
void worker_task()
{
while(1)
{
rtdm_task_sleep_abs(lrtdrv_time_of_irq_ns + 950000ull,
RTDM_TIMERMODE_ABSOLUTE);
do_something();
}
}
_kernel_rtdm_irq_handler()
{
lrtdrv_time_of_irq_ns = rtdm_clock_read_monotonic();
}
the _kernel_irq_callback() is called every 1ms.
we will , that the worker_task begin 50us before next irq
But sometime, the worker task start ~50us after irq. Why ?
Sometime we call xntbase_adjust_time to sync external RTC with internal
clocks.
can this be a problem ?
Hardware & Software
X86 SMP Dual celeron
Linux Kernel 3.10.0
Xenomai 2.6.3
Regards
Johann
next reply other threads:[~2015-07-09 12:15 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-09 12:15 Johann Obermayr [this message]
2015-07-09 14:19 ` [Xenomai] usage of rtdm_task_sleep_abs Gilles Chanteperdrix
2015-07-09 15:43 ` Johann Obermayr
2015-07-09 15:51 ` Gilles Chanteperdrix
2015-07-10 9:34 ` Johann Obermayr
2015-07-10 9:46 ` Gilles Chanteperdrix
2015-07-10 10:43 ` Johann Obermayr
2015-07-10 10:49 ` Gilles Chanteperdrix
2015-07-13 13:41 ` Johann Obermayr
2015-07-13 14:02 ` Gilles Chanteperdrix
2015-07-13 14:56 ` Johann Obermayr
2015-07-13 15:24 ` Gilles Chanteperdrix
2015-07-13 16:58 ` Johann Obermayr
2015-07-13 17:21 ` Gilles Chanteperdrix
2015-07-13 17:26 ` Johann Obermayr
2015-07-13 19:58 ` Gilles Chanteperdrix
2015-07-13 20:23 ` Johann Obermayr
2015-07-13 20:31 ` Gilles Chanteperdrix
2015-07-13 20:45 ` Johann Obermayr
2015-07-13 20:54 ` Gilles Chanteperdrix
2015-07-13 21:30 ` Johann Obermayr
2015-07-13 21:58 ` Johann Obermayr
2015-07-13 22:39 ` Gilles Chanteperdrix
2015-07-13 23:30 ` Johann Obermayr
2015-07-14 0:02 ` Gilles Chanteperdrix
2015-07-15 21:00 ` Johann Obermayr
2015-07-15 21:21 ` [Xenomai] ipipe trace Johann Obermayr
2015-07-16 6:30 ` [Xenomai] usage of rtdm_task_sleep_abs Gilles Chanteperdrix
2015-07-16 11:46 ` Johann Obermayr
2015-07-17 5:25 ` Gilles Chanteperdrix
2015-07-13 20:35 ` Gilles Chanteperdrix
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