From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: GP Orcullo <kinsamanka@gmail.com>, xenomai@xenomai.org
Subject: Re: [Xenomai] ODROID-U3 porting problems
Date: Wed, 27 Aug 2014 17:45:43 +0200 [thread overview]
Message-ID: <53FDFD27.2010207@xenomai.org> (raw)
In-Reply-To: <CACreCV+9seA7yp8gmjvOb6CQ7-Fbt-HyQ6YAoB_dqtmqmyvy7Q@mail.gmail.com>
On 08/27/2014 03:49 PM, GP Orcullo wrote:
> Hi,
>
> I'm in the process of porting xenomai to Samsung Exynos 4420 based
> ODROID-U3 board. I've followed the online manual and I was able to finish
> up to the interrupt controller part.
>
> So far everything works when booting the board with CONFIG_IPIPE and
> CONFIG_XENOMAI enabled. However, running the latency test gives the
> following results:
>
> root@odroidu3:~# /usr/lib/xenomai/testsuite/latency -t 0 -T5
> == Sampling period: 1000 us
> == Test mode: periodic user-mode task
> == All results in microseconds
> warming up...
> RTT| 00:00:01 (periodic user-mode task, 1000 us period, priority 99)
> RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat best|--lat worst
> RTD|-1054607.854|-555107.854|-416666.667| 0|
> 0|-1054607.854|-416666.667
> RTD|-2054607.854|-1555107.854|-416666.667| 0|
> 0|-2054607.854|-416666.667
> RTD|1240359.443|1739859.443|-416666.667| 0| 0|1240359.443|-416666.667
> RTD| 240359.443| 739859.443|-416666.667| 0| 0| 240359.443|-416666.667
> ---|-----------|-----------|-----------|--------|------|-------------------------
> RTS| 240359.443|-2055107.854|-416666.667| 0| 0| 00:00:05/00:00:05
I would say you have a problem with the tsc emulation. Have you tried to
run the "tsc" program?
> [ 0.000000] Linux version 3.8.13.11-xen (gemi@odroidu3) (gcc version 4.6.3 (Debian 4.6.3-14) ) #34 SMP PREEMPT Wed Aug 27 20:22:46 SGT 2014 ()
3.8.13 is a bit old, I would advise you to use 3.14 if you plan to get
your changes merged.
> [ 0.000000] Kernel was built at commit id ''
> [ 0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c5387d
So, this is a cortex a9. On Cortex a9, Xenomai tries to use the global
timer for tsc emulation. Are you sure this processor has a global timer?
Again, running the "tsc" program will help you see if the tsc emulation
is working correctly.
--
Gilles.
next prev parent reply other threads:[~2014-08-27 15:45 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-27 13:49 [Xenomai] ODROID-U3 porting problems GP Orcullo
2014-08-27 15:45 ` Gilles Chanteperdrix [this message]
2014-08-27 17:14 ` Gilles Chanteperdrix
2014-08-28 13:45 ` GP Orcullo
2014-08-28 13:51 ` Gilles Chanteperdrix
2014-08-28 15:12 ` Poole Jr, Donald R.
2014-08-28 16:34 ` GP Orcullo
2014-08-28 16:40 ` Gilles Chanteperdrix
2014-08-28 17:05 ` GP Orcullo
2014-08-28 18:34 ` Gilles Chanteperdrix
2014-08-30 0:17 ` GP Orcullo
2014-08-30 1:11 ` Gilles Chanteperdrix
2014-08-30 2:22 ` Gilles Chanteperdrix
2014-08-30 2:40 ` GP Orcullo
2014-08-29 23:13 ` Alexandre Donisete Bensi
2014-08-30 0:50 ` GP Orcullo
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