Overclock the N900? - Page 156 - maemo.org

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ticktock666	2010-04-07 , 15:51
Posts: 38 \| Thanked: 14 times \| Joined on Feb 2010	#1551

Thanks man and sorry for the trouble, I found my mistake, instead of :
sample_max-_freq 750000 , I had
sample_max-_freq7500000 .... :s

good thing I made a mistake with that space after "freq" or I would be running my n900 @ 7.5 ghz... :/

fixed that and everything seems to be ok

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titan	2010-04-07 , 15:58
Posts: 946 \| Thanked: 1,650 times \| Joined on Oct 2009 @ Germany	#1552

Originally Posted by ticktock666

Strange, I did exactly this, but the changes are not sticking, after reboot it reverts cpu speed back to 600 (from conky) even though when I check the pmconfig file it shows that the sample_max_freq is set to 750000, any ideas what would be the problem here ?

editing /etc/pmconfig works fine for me. it sets it to 700MHz on my device during booting.

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titan	2010-04-07 , 16:02
Posts: 946 \| Thanked: 1,650 times \| Joined on Oct 2009 @ Germany	#1553

warning: do not set values in /etc/pmconfig before you have thoroughly tested them
by changing /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq.
otherwise you might end up with a reboot loop.

another observation: The dmse daemon seems to overwrite the max. freq. in the kernel with the value
from /etc/pmconfig every hour or so.

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The Following 4 Users Say Thank You to titan For This Useful Post:
egoshin, Faz, mikhmv, PhonoN900

	NokiaRocks	2010-04-07 , 16:08
	Posts: 658 \| Thanked: 117 times \| Joined on Jan 2010	#1554

Would be cool if someone could code an app which reduces the voltage and overclocks the cpu to 800 or 900 Mhz.

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Bratag	2010-04-07 , 16:17
Posts: 2,014 \| Thanked: 1,581 times \| Joined on Sep 2009	#1555

Originally Posted by titan

editing /etc/pmconfig works fine for me. it sets it to 700MHz on my device during booting.

It does set the speed at boot, however it doesnt hold that speed after the first time the phone goes to sleep. I am forced to echo to get speed back.

__________________
Class .. : Power Poster, Potential Coder
Humor .. : [*********] Alignment: Chaotic Evil
Patience : [***-------] Weapon(s): +2 Logic Mace
Agro ... : |*****-----] Relic(s) : G1, N900

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youp	2010-04-07 , 16:23
Posts: 2 \| Thanked: 0 times \| Joined on Apr 2010	#1556

Originally Posted by Lehto

Ultimately you guys should use titans or Matans kernels, they know their stuff much better than I do. The information about those rests somewhere in this thread.

READ BEFORE FLASHING NEW KERNEL!!!

I CANNOT BE HELD RESPONSIBLE FOR WHATEVER HAPPENS AFTER YOU'VE DOWNLOADED THE FOLLOWING FILE. YOUR ON YOUR OWN. THE DEVICE COULD BE RENDERED BROKEN, USELESS OR SOME OTHER WAY LIMITED!!! ALSO NO HELP WILL BE PROVIDED BY ME TO FLASH IT TO YOUR PHONE.
YOU WARRANTLY WILL BE VOID AFTER FLASHING ONE OF THESE IN YOUR PHONE
YOU HAVE BEEN WARNED!!!

Your phone will nolonger be recognized by the "settings - about" correctly.

Nokia Software updater no longer functions as a firmware updater. You will have to use the same tool you flashed new kernel with to flash newest update (Dont know if OTA works yet!)

Have fun, dont break your device!

Here be the dragons. Little differently tweaked kernels with DSP oc also or just considered very unsafe. Doubt it makes any difference at all. (Do NOT try these unless you are absolutely certain!)

The faster kernels will come later if nobody reports a dead device in a week.

Little infos on these kernel files:
1. They will make the about page say <unknown> for the hardware and software.

2. There is an additional speed step down from 250mhz. So instead of 250mhz idle it now sits @ 125mhz idle with lower voltage.
125/250/500/550/xxx
instead of
250/500/550/600

3. Your sacrificing machine lifetime by running it overclocked and stressing it at 100% for longer periods of time.

4. Everything will feel faster and is faster.

5. The fastest kernels might not work on your phone, this is purely down to luck of how good chip you've got in your phone. Climate affects it also along with many other variables.

6. This requires only flashing the new kernel in, the phone setups and apps will stay. Only the clock speed increases.

Some behaviour I've seen when playing with clockrates... this might just be my inexperience.

1. The N900 seems to prefer the 125 , 500 and the highest speeds and rarely enters the middle speeds like 250 and 550 with OC kernel.

2. If I set 550 speed (second fastest) to anything faster than 599mhz the phone seems to stop using the fastest mode and instead reverst to the OPP4 state.
So best compromise seems to be the 125/250/500/595/900 kernel.
2b. After getting a hint from another finnish person through PM about the /etc/pmconfig and its max frequency I edited it to 1030mhz and set the second fastest speed at first to 650, then to 700 and lastly to 775mhz and I see absolutely no difference in behaviour. The phone just discriminates the second fastest mode and rarely ever uses it.

Im still learning and my learning curve could be expensive so dont just automatically flash the fastest kernel found here. It CAN have nasty drawbacks. PLUS there are people far more knowledgeable than me, so hopefully they will take over this eventually and write us proper SetCPU like software.

If and when you get angry of the OC kernel. Here is how to flash back the original nokia built kernel.
Code:
sudo gainroot
apt-get install --reinstall kernel kernel-flasher
reboot
After installing the new kernel, run this! This gets you back the about information.
Code:
sudo gainroot 
apt-get install --reinstall mp-fremantle-generic-pr 
reboot

thanks man, any body tried 1ghz speed? so it s stable on n900 like 900mhz??

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Rushmore	2010-04-07 , 16:25
Posts: 1,255 \| Thanked: 393 times \| Joined on Oct 2009 @ US	#1557

Something seems to not make sense with Conky. Anyone notice that regardless of the clock speed, the percent of cpu usage stays fairly "constant"?

Example playing a 160KB MP3 with built-in media player:

Clock fluctuates from 125mhz on up to 800mhz, but the cpu usage percent ranges from 50% to 53%. I would expect both values (clock and usage) to be relative and not such a wide margin of fluctuation with the clock and usage. If one is constant, the other should be. I could see if there is lag for one value to the next, but that should be an issue of displacement of values, rather than one staying always "constant" (the usage).

BTW, most of the time, cpu is at 125mhz, but does fluctuate for several seconds up from 500 to 800, but usage does not deviate from 50% to 53% range.

Last edited by Rushmore; 2010-04-07 at 16:32.

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firstknight	2010-04-07 , 16:26
Posts: 143 \| Thanked: 4 times \| Joined on Jan 2010	#1558

Originally Posted by michalurban

Just installed your experimental 125-1200 kernel, works great, thx! Im gonna write a simple script setting the upscale and downscale freq, after that Ill upload it.

I got a question or somethin i am encountering...

I have upscale to 800 but after some time it will go tback to 600 even when i checked it... is this usual???

TITAN??

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psrkn	2010-04-07 , 16:39
Posts: 68 \| Thanked: 4 times \| Joined on Feb 2010	#1559

Originally Posted by firstknight

I got a question or somethin i am encountering...

I have upscale to 800 but after some time it will go tback to 600 even when i checked it... is this usual???

TITAN??

From a couple posts up, there is a post from Titan and said that another observation: The dmse daemon seems to overwrite the max. freq. in the kernel with the value
from /etc/pmconfig every hour or so.