From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <5228FA40.6010107@xenomai.org> Date: Thu, 05 Sep 2013 23:40:16 +0200 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <51CD5651.6030804@wanadoo.fr> <51D07B48.9060206@xenomai.org> <5228F853.7020002@wanadoo.fr> In-Reply-To: <5228F853.7020002@wanadoo.fr> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai] Thermal issue on iMX6q List-Id: Discussions about the Xenomai project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Thierry Bultel Cc: xenomai@xenomai.org 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.