[PATCH] Dynamic CPU Scaling + [720p UPDATE] Effective Power Saving When Device Is Active/Idle -720p Update- - Page 5 - maemo.org

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trisha02	2011-09-05 , 13:01
Posts: 915 \| Thanked: 57 times \| Joined on Jun 2011	#41

these are the settings of usr/local/bin/overclock

#!/bin/sh
kernel-config load ideal
kernel-config limits 250 750
echo 100 > /proc/sys/vm/vfs_cache_pressure

and this is my ideal profie

# By Karam Baki
MINFREQ=125
MAXFREQ=750
FREQS="0:27,90 250:27,180 500:32,360 600:38,430 700:45,430 750:45,430 805:48,430 850:48,500 900:54,500 950:54,500 1000:60,500 1100:72,520 1150:72,520"
SMARTREFLEX_VDD1=1
SMARTREFLEX_VDD2=1
GOVERNOR=conservative
IGNORE_NICE_LOAD=1
UP_THRESHOLD=75
SAMPLING_RATE=150000
POWERSAVE_BIAS=0

can anyone suggest me any changes that are necessary? pleaseeeeeeeeeeeeee

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	corduroysack	2011-09-05 , 13:25
	Posts: 939 \| Thanked: 366 times \| Joined on Dec 2010 @ U.K.	#42

Originally Posted by T4UR14N

the best way i can recommend you to fix it CLICK HERE

ps. somethings just aren't for some people

roflmfao it's been suggested lol

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	ammyt	2011-09-05 , 13:48
	Posts: 1,918 \| Thanked: 3,118 times \| Joined on Oct 2010 @ My pants	#43

==New update:== Added the usage of process SIGSTOP, this should prevent greedy processes such as trackerd, browserd, calender-ui... from eating power while your device is idle.

These processes will "pause" while your device is idle, which should result in a drastic battery improvement.

Put both CPUTweak.tar and CPUTweak.sh.txt in ./MyDocs then open Xterminal:

Code:

root
apt-get install dbus-scripts
cd /home/user/MyDocs/
sh CPUTweak.sh.txt

Default settings here are:
Idle: 0 500MHz starving vfs_cache_pressure 10
paused processes: browserd scim-panel-gtk image-viewer

Active: 500 1150 MHz ideal vfs_cache pressure 100

Updated Post: http://talk.maemo.org/showpost.php?p...1&postcount=14

Attached Files

	CPUTweak.sh.txt (482 Bytes, 87 views)
	CPUTweak.tar (6.5 KB, 85 views)

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Last edited by ammyt; 2011-09-05 at 13:55.

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zurrain101	2011-09-05 , 13:53
Posts: 536 \| Thanked: 81 times \| Joined on May 2011 @ Russia	#44

do we have to remove old patch first or can e directly do this with new patch?

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	ammyt	2011-09-05 , 13:54
	Posts: 1,918 \| Thanked: 3,118 times \| Joined on Oct 2010 @ My pants	#45

Originally Posted by zurrain101

do we have to remove old patch first or can e directly do this with new patch?

Doesn't really matter, whatever you prefer

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The Following User Says Thank You to ammyt For This Useful Post:
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	ammyt	2011-09-05 , 13:55
	Posts: 1,918 \| Thanked: 3,118 times \| Joined on Oct 2010 @ My pants	#46

I have to update this post:
http://talk.maemo.org/showpost.php?p...1&postcount=14
since GigaByte's first post refers to it...

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GigaByte	2011-09-05 , 14:35
Posts: 144 \| Thanked: 68 times \| Joined on Mar 2011 @ a spot	#47

Just logged in, I can see that you've updated the script ammyt.
I wonder tho, can I pause Xorg or hildon-desktop while idle? They are the biggest CPU munchers...

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trisha02	2011-09-05 , 15:08
Posts: 915 \| Thanked: 57 times \| Joined on Jun 2011	#48

did anyone have a look at my problem or whatever you call it. i installed the new patch with this power settings. orginal overclock was 500 1150. since i enabled smart reflex i chnged it to 500 750mhz. i am using this profile:
# By Karam Baki
MINFREQ=125
MAXFREQ=750
FREQS="0:27,90 250:27,180 500:32,360 600:38,430 700:45,430 750:45,430 805:48,430 850:48,500 900:54,500 950:54,500 1000:60,500 1100:72,520 1150:72,520"
SMARTREFLEX_VDD1=1
SMARTREFLEX_VDD2=1
GOVERNOR=conservative
IGNORE_NICE_LOAD=1
UP_THRESHOLD=75
SAMPLING_RATE=150000
POWERSAVE_BIAS=0

is it okay?

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	Estel	2011-09-05 , 15:24
	Posts: 5,028 \| Thanked: 8,613 times \| Joined on Mar 2011	#49

Originally Posted by ammyt

But don't forget the vfs_cache_pressure trick, which is set at 10 while idle and 100 while active which is proven to give humongous battery life.

I'm "little" skeptical about effectiveness of this (it affect handling caching filesystem vs. application data in RAM, and RAM use same ammount of power, no matter if You got 200 used or 200 free...), at least, unless someone may provide hard proof via - for example - 'bq27200.sh 5' current monitoring of ~30 minutes in idle, in same N900 with only this setting changed. AFAIK, no one proved real benefit here, so I may be wrong.

Still, thanks for Your work, monitoring dbus signals may be useful in other cases

Ps.

don't set limits to:

Code:

limits 0 500

... it simply won't work. With 125 and 250 blacklisted, device will still idle @ 500 - so, no harm, no gain - and without blacklisting 125 and 250, it may lock on some of them, under specific conditions.

"0" isn't proper value for CPU frequency. CPU underclock to effective 0 mhz via other mechanism (when idle), not controllable via kernel settings, at least currently.

If someone really want, limiting it to "500 500" will work, but device with limits 500-900 doesn't use more power in idle. In fact, when I measured it limited to 500 vs. limited to 900 for ~10 hours, limits on 900 used less power - ho ever, only by 30-40 mAh (during ~10 hours, not per hour).

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Last edited by Estel; 2011-09-05 at 15:30.