Re: Overheating Pandas

2013-07-03 Thread Will Newton
On 3 July 2013 14:13, Renato Golin wrote: > Hi Folks, > > I'm running two buildbots here at home and am getting consistent failures > from the Pandas because of overheating. I've set up a monitor that will tell > me the current CPU temperature and the allowed maximum, and when the bot > passes 90%

Re: Overheating Pandas

2013-07-03 Thread Mans Rullgard
On 3 July 2013 18:33, Richard Earnshaw wrote: > On 03/07/13 17:41, Renato Golin wrote: >> >> On 3 July 2013 17:22, Mans Rullgard > > wrote: >> >> I repeat, the 4460 will run at 1.2GHz indefinitely without thermal >> management. >> >> >> My mistake, I said 1

Re: Overheating Pandas

2013-07-03 Thread Renato Golin
On 3 July 2013 18:33, Richard Earnshaw wrote: > Chips expected to dissipate large amounts of power normally have a metal > pad on the package so that a heat sink with thermal grease will make a good > thermal contact. > This is a really good point. The heat-sink do get really hot, but it's not t

Re: Overheating Pandas

2013-07-03 Thread Renato Golin
On 3 July 2013 18:08, Mans Rullgard wrote: > 4430 max frequency is 1.0GHz unless I'm mistaken. Either way, try > reducing your clock to 1.0GHz and see what happens. > Yes, I meant 4430 and 4460 at their natural high frequencies. $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_freq

Re: Overheating Pandas

2013-07-03 Thread Richard Earnshaw
On 03/07/13 17:41, Renato Golin wrote: On 3 July 2013 17:22, Mans Rullgard mailto:mans.rullg...@linaro.org>> wrote: I repeat, the 4460 will run at 1.2GHz indefinitely without thermal management. My mistake, I said 1.3GHz when it was actually 1.2GHz. So, at 1.2GHz, it freezes every few

Re: Overheating Pandas

2013-07-03 Thread Mans Rullgard
On 3 July 2013 17:41, Renato Golin wrote: > On 3 July 2013 17:22, Mans Rullgard wrote: >> >> I repeat, the 4460 will run at 1.2GHz indefinitely without thermal >> management. > > > My mistake, I said 1.3GHz when it was actually 1.2GHz. So, at 1.2GHz, it > freezes every few hours on full load on b

Re: [Linaro-validation] Overheating Pandas

2013-07-03 Thread James Tunnicliffe
On 3 July 2013 17:41, Renato Golin wrote: > On 3 July 2013 17:22, Mans Rullgard wrote: >> >> I repeat, the 4460 will run at 1.2GHz indefinitely without thermal >> management. > > > My mistake, I said 1.3GHz when it was actually 1.2GHz. So, at 1.2GHz, it > freezes every few hours on full load on b

Re: Overheating Pandas

2013-07-03 Thread Renato Golin
On 3 July 2013 17:22, Mans Rullgard wrote: > I repeat, the 4460 will run at 1.2GHz indefinitely without thermal > management. > My mistake, I said 1.3GHz when it was actually 1.2GHz. So, at 1.2GHz, it freezes every few hours on full load on both 4430 and 4460. linaro@linaro-panda-01:~$ cat /sys

Re: Overheating Pandas

2013-07-03 Thread Mans Rullgard
On 3 July 2013 16:48, Renato Golin wrote: > On 3 July 2013 15:59, Mans Rullgard wrote: >> >> An OMAP4460 will run at 1.2GHz indefinitely without overheating in >> reasonable ambient temperature. >> >> If you don't have thermal management in the kernel you're running, you >> need to clamp the cloc

Re: Overheating Pandas

2013-07-03 Thread Renato Golin
On 3 July 2013 15:59, Mans Rullgard wrote: > Modern silicon processes are much more power-efficient than those of the > 90s. > For example, an old ~500MHz Alpha machine I have readily consumes 90W even > when idle. A quad-core Intel i7 typically has a TDP of 130W at full load. > That's orders of

Re: [Linaro-validation] Overheating Pandas

2013-07-03 Thread Renato Golin
On 3 July 2013 15:42, James Tunnicliffe wrote: > I believe that in the LAVA lab there are a few pandas with USB keys > that are used for builds to try and overcome some reliability > problems. I'm using USB drives for that reason. Is running at 100% of the thermal limit really an issue? Isn't

Re: Overheating Pandas

2013-07-03 Thread Mans Rullgard
On 3 July 2013 14:13, Renato Golin wrote: > Hi Folks, > > I'm running two buildbots here at home and am getting consistent failures > from the Pandas because of overheating. I've set up a monitor that will tell > me the current CPU temperature and the allowed maximum, and when the bot > passes 90%

Re: [Linaro-validation] Overheating Pandas

2013-07-03 Thread James Tunnicliffe
I believe that in the LAVA lab there are a few pandas with USB keys that are used for builds to try and overcome some reliability problems. Don't know if it was a temperature problem or something else. With any luck someone who knows more about that issue can speak up and share what they found. You

Overheating Pandas

2013-07-03 Thread Renato Golin
Hi Folks, I'm running two buildbots here at home and am getting consistent failures from the Pandas because of overheating. I've set up a monitor that will tell me the current CPU temperature and the allowed maximum, and when the bot passes 90%, it shuts itself off. The problem is that I'm runnin