From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Thierry Bultel <thierry.bultel@wanadoo.fr>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai] Thermal issue on iMX6q
Date: Thu, 05 Sep 2013 23:40:16 +0200 [thread overview]
Message-ID: <5228FA40.6010107@xenomai.org> (raw)
In-Reply-To: <5228F853.7020002@wanadoo.fr>
On 09/05/2013 11:32 PM, Thierry Bultel wrote:
> Hi,
>
> I have noticed something really weird.
> I was using for months the 3.0.43 kernel from ipipe-gch.git
>
> When the target is idle, I mean, with 4 CPUs at almost 0 % load,
> the temperature (/sys/class/thermal/thermal_zone0/temp) is about 66 degrees.
> (there is no heat spreader).
>
> With each CPU at 100%, the temperature gets over 90 quickly and the
> target reboots.
>
> Since today, I was -at last- able to apply the latest available ipipe patch
> (adeos-ipipe-3.0.43) from xenomai-2.6.git head) on the 3.0.35_4.0.0
> kernel from Freescale.
>
> With that kernel, in idle, the temperature is only 44 degrees,
> with 4 CPUs to 100% the temperature stabilizes at 60 degrees.
>
> I am a little bit puzzled ... I am obviously using the same config in
> both cases.
> Does anyone have an idea ?
Are you sure the CPU is running at the same frequency in both cases?
Have you checked the kernel parameter I talked you about 3 monthes ago?
--
Gilles.
next prev parent reply other threads:[~2013-09-05 21:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-28 9:24 [Xenomai] Thermal issue on iMX6q Thierry Bultel
2013-06-30 18:39 ` Gilles Chanteperdrix
2013-09-05 21:32 ` Thierry Bultel
2013-09-05 21:40 ` Gilles Chanteperdrix [this message]
2013-09-05 21:43 ` Gilles Chanteperdrix
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