Thread: Small app to keep processor at 500Mhz, possible?
View Single Post
egoshin is offline egoshin
2010-04-26 , 20:40
Posts: 992 | Thanked: 995 times | Joined on Dec 2009 @ California
#39
Originally Posted by Matan View Post
There is nothing in the kernel to reduce frequency from 600MHz under load. I bet there is also none in user space, as it does not make sense to put it in user space. I ran simple program to use 100% cpu time for 3 hours, and all 3 hours were at 600MHz. If your metalayer-crawler (or any other program) goes crazy, and you put the N900 to charge and go to sleep, then it spends all the night in 600MHz (and 1.375V), and generates a lot of heat.
I can add something interesting here - I also ran that test and monitored battery and heat. I should say that it is not very big actually (I have SmartReflex switched ON). Actually, the back cover is not heated at all.

But I definitely see a HUGE power consumption during some video processing even with thumbnailer tracker in background. It is definitely not CPU (and I don't use overclocked kernel) but it is on CPU chip. I suspect it is SGX or OneNAND R/W - some people reported a very hot device and battery exhausted fast with a moderate CPU usage.

So, I don't think the CPU heat is an issue for this specific ARM CPU. Nokia doesn't rush to publish PR1.2 which should fix at least some of video related issues.
 

The Following User Says Thank You to egoshin For This Useful Post: