maemo.org - Talk - View Single Post - overclock stock kernel for pr1.2

Alex Atkin UK	2010-06-02 , 02:09
Posts: 716 \| Thanked: 303 times \| Joined on Sep 2009 @ Sheffield, UK	#4

Originally Posted by fahadj2003

does anyone know how to overclock the stock kernel *not titan's kernel*? cpu and dsp?

You can't, that is the whole point of the power kernel - to add functionality the stock kernel does not have.

That said, if you are having problems I doubt they are related to the power kernel. I am using modified Ideal settings (added back 250Mhz min, 1000Mhz max) and for the first time ever I can keep my N900 idle all day and only lose one notch on the battery.

It still drains fast in actual use, but I don't think its any worse than before.

Originally Posted by digittante

Results:
Attempts to overclock this install via Titan's kernel-power-settings produced frequent system freezes in the browser, in the phone app, in the email app, and when resuming from sleep via the side-slider button (i.e. system would not resume). In all cases of system freeze, I resorted to pulling/re-seating the battery in order to reboot each time.

The only power-settings I explored while doing this were based on the Ideal settings, with limits set to 125/750, 125/850, 125/950, 250/750, 250/850, and 250/950.

The ideal profile seems to have changed recently with 500Mhz being the minimum now. Changing the limits using kernel-config does nothing, as nothing below 500 is listed in the ideal profile so anything below 500Mhz is ignored.

My current overclocked profile (/home/user/.kernel/overclocked) with 0 and 250Mhz added back in is:

# kernel configuration file generated by /usr/sbin/kernel-config
MINFREQ=250
MAXFREQ=1000
FREQS="0:30,90 250:28,180 500:30,360 550:33,400 600:38,430 700:45,430 750:45,430 805:48,430 850:48,500 900:54,500 950:54,500 1000:60,500 1100:72,520 1150:72,520 "
SMARTREFLEX_VDD1=0
SMARTREFLEX_VDD2=0
GOVERNOR=ondemand
IGNORE_NICE_LOAD=1
UP_THRESHOLD=75
SAMPLING_RATE=150000
POWERSAVE_BIAS=0

Ideal is however:

# minimum frequency to use
MINFREQ=500
# maximum frequency to use
MAXFREQ=850
# list of frequency configurations: each "frequency:volt,dsprate"
FREQS="500:30,360 550:33,400 600:38,430 700:45,430 750:45,430 805:48,430 850:48,500 900:54,500 950:54,500 1000:60,500 1100:72,520 1150:72,520"
SMARTREFLEX_VDD1=0
SMARTREFLEX_VDD2=0
GOVERNOR=ondemand
UP_THRESHOLD=75
SAMPLING_RATE=150000
IGNORE_NICE_LOAD=1
POWERSAVE_BIAS=0

As you can see, all frequencies below 500 are missing so even if you set minimum to 125 or 250, it will only ever go as low as 500Mhz. I'm not sure why this change was made.

All I can say is with my overclocked settings my current uptime is 6 days, 14:26 and counting.

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Last edited by Alex Atkin UK; 2010-06-02 at 02:21.

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