Quick under volting question - T-Mobile Samsung Galaxy S II SGH-T989

I am familiar with undervolting, went -75 across the board with no problems, obviously the lowest frequencies are all at 800. Would it be beneficial to set the minimum CPU frequency to the highest frequency at 800mv? Seeing as there is no voltage difference between 192mhz and 594mhz wouldn't it make sense and even save battery to set minimum to 594 so it can idle faster basically and use less time to do calcs at minimum frequency?
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zander21510 said:
I am familiar with undervolting, went -75 across the board with no problems, obviously the lowest frequencies are all at 800. Would it be beneficial to set the minimum CPU frequency to the highest frequency at 800mv? Seeing as there is no voltage difference between 192mhz and 594mhz wouldn't it make sense and even save battery to set minimum to 594 so it can idle faster basically and use less time to do calcs at minimum frequency?
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Theoretically yes, but undervolting that low at high clock speeds will greatly increase your chances of freezing.

Related

SetCPU settings for Epic 4g

Im new to android, what is the best setting for setcpu for balancing performance and battery life. Thanks in advance
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What Rom/kernel are you on? Voltage Control might be the better option.
The Root said:
What Rom/kernel are you on? Voltage Control might be the better option.
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On leaky gingerbread eeo3, don't know what kernel but kernel version is 2.6.35.7, firmware is 2.3.3...
The lower the maximum speed you can tolerate will give you the max battery life. A lot of people keep 800 Mhz as max for that reason.
If you want a good mix between battery and performance, I recommend keeping your maximum clock at 1000Mhz (default) and lowering your minimum clock to 100Mhz (default should be 200Mhz) if your phone will allow it.
Blankrubber said:
If you want a good mix between battery and performance, I recommend keeping your maximum clock at 1000Mhz (default) and lowering your minimum clock to 100Mhz (default should be 200Mhz) if your phone will allow it.
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Yeah, just make sure you have journaling on if you are going to try 100 Mhz. A lot of phones get the sleep of death from that. Mine is one of those. Then you will have to pull the battery and adjust your settings to 200 Mhz minimum on SetCPU.
Or....You could not use 100mhz at all!
It uses the same voltage as 200mhz. And by increasing the amount frequencies scaled makes the phone slower.
800mhz max, 200mhz min. 800mhz is volted -75 over 1ghz. Which should increase battery life.
Awsome stuff guys. Thanks for all the great info and to all that reply... Thanks again
Sent From My Epic 4G
darkierawr said:
Or....You could not use 100mhz at all!
It uses the same voltage as 200mhz. And by increasing the amount frequencies scaled makes the phone slower.
800mhz max, 200mhz min. 800mhz is volted -75 over 1ghz. Which should increase battery life.
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I'd quote him but I'm on my phone. Rodderik has stated that all the frequencies use the same internal voltage except for 100mhz, which uses a slightly less internal voltage. What we're adjusting and seeing read in voltage control is the arm voltage, or the processor voltage at each frequencies. I'm not sure the exact difference, but there is a slight drop in voltage at 100mhz compared to the other frequencies? A battery saving difference? Who knows
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Just insalled new syndicate frozen rom. Set cpu not compatible? Installed set cpu and every time screen goes to sleep, I can't get it to wake up unless I pull out battery. Anybody else having this problem on this rom?
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otee670 said:
Just insalled new syndicate frozen rom. Set cpu not compatible? Installed set cpu and every time screen goes to sleep, I can't get it to wake up unless I pull out battery. Anybody else having this problem on this rom?
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Everyone try conservative now, not on demand...
Edit::: The problem is with Voltage control 4b4, I'm going to test more before I report and start a thread, but feel free to...
Help support autism awareness,it only takes 2 seconds to help make a difference...
http://picketfenceblogs.com/vote/3616
Just changed setting to coservative and so far it seems to be working. settings is max-1300000 min-200 conservative (charging) max-1300000 min-1300000 conservative (screen off) max-400 min-400 consevative... on screen off, I tried max-200 min-200 phone stays in sleep. This what worked for me...
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Thanks to ecooce
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How to use voltage control

How can do I use voltage control and what are the best settings for my epic 4g I'm on shadowkernel
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This is going to be a long post........
Once downloaded there are a lot to do but in general there are i/o schedulers I think that's how data is handled Idk google is ur friend. Anyways govenors handles the cpu and "governs" the frequencies it needs to be pushed to depending on what the kernel is telling it via touch input wifi cell signal etc etc. And on the sliders are the frequencies. The max is the max amount the cpu will be pushed and the min vice versa. In the voltages tab you use these to disable or enable frequencies..... tap the grayed out cpu picture.... to enable.... then you tap on the numbers to open the sliders and this will allow you to undervolt this takes the stock voltage your battery puts out and lowers it to put out less battery. For some guidelines ill post what I use but every phone is different.
100/1200. OnDemand Sio
100: -200
200-175
400:-150
800:-100
1000:-75
1100:-50
1200:-50
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Is the lower the better?
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thabest85 said:
Is the lower the better?
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On what??? Frequency or voltage for frequency higher is faster. Voltage the lower is better but not too low otherwise your phone will freeze and data will get corrupted
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thabest85 said:
Is the lower the better?
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Higher frequency = the phone operates faster. Some users' phones lock up at the higher frequencies (1.3GHz+), so you need to experiment to see what your phone can handle.
Lower voltage = the phone uses less battery while using that frequency. If the voltage is lower than the CPU needs to run at that frequency, your phone could lock up, so you need to experiment with voltages to find a set that works before setting them as boot.

[Q] Overclocking

How safe is it to overclock my Galaxy S II to 1.78 max and 1.78 min?
If not, what combination of max and min would be most safe but still give a noticeably boost in speed.
In theory overclocking isn't that good as is adding additional strain to the CPU than it was designed to.this will cause wear and tear faster possibly shortening the life of your phone. I would set your min much lower and place it on demand. There's no need for your CPU to be running at max all the time, set it on demand do it only runs at a faster speed when it's needed to...
PS this has been covered in other threads a search would have given you an answer oppose to starting another thread.
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Voltage kills components, not overclocking.
You can google this and research it if you would like.
I keep mine min 810 max 1782 ondemand with setcpu.
810 is more than enough(still faster than Iphone4) to hold its own without lag when you actually start to bog it down.
I think the max itll go is 1.83ghz. in reality nothing over 1.65ish really adds anything.
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locked mine at 1.51ghz which is plenty of fast, no throttling and no lag
Setting the min up that high will kill your battery in hours. You can over clock it by setting the max up to whatever you like. Set the min lower. Then set your governor. Overclocking will wear down your cpu faster and make it run hotter. Overvolting will do the same. I would only overclock when I need it. Normally mine is set at 1.5 for max and .3-.5 for min.

Lower min clock speed

Any devs think it's possible to lower the min clock speed on our phones? 384MHz seem a bit high compared to all the other devices I have used... (long list)
I noticed the n4 was able to bring it down to 300MHz. Any possibilities for us? Or any custom jb kernels in the works?
Thanks
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This would need to be coded in kernel. However, lowering the minimum frequence would not mean we would have better battery life. I could go really long explaining this but i'll try to keep it basic. 1st, the energy used vs frequency is not linear. For example, 500Mhz would not use half the energy than 1Ghz. 2nd, This would either cause the kernel to have an higher load than 384Mhz, which would in fact increase the energy consumption or Bump the kernel to an higher frequency, which would make that frequency useless. In both case we are not winning any battery life.

minimum cpu speed question

Have a question regarding min CPU speed vs voltage. I run task's Roman with stock kernel. My phone is not stable unless I up the voltage on the CPU clock at both the 189 and 378 speeds to 925mv.
So here's the question... since both speeds use 925mv, wouldn't it make more sense just to leave the min CPU speed at 378? Seems to me the faster min speed would process faster allowing the phone to go into deep sleep faster and saving battery.
Thoughts?
192 and 384, you mean?
Personally, I prefer my min at 192 not cos of mV difference, but cos it keeps my phone lots cooler when at min speeds.
I asked a similar question with no response. mine goes down to 81mhz and stays stable but a higher clock speed uses the same voltage so I thought just run the higher one. unless deep sleep is consistent then it shouldnt matter. but for cases like bluetooth or music streaming the higher speed might seem better. but the more heat thing must cause more battery usage I would think
s384 said:
I asked a similar question with no response.....
....more heat thing must cause more battery usage I would think
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Looks like some thread lost with time...
More heat isn't good... heat is nothing but energy dissipated... and that means energy lost... So more heat is an indicator that you are kinda pushing your CPU to work hard and harder the work, more the battery utilized.
The voltage consumption of a CPU is calculated by f*V^2. So to answer the question, even if two frequencies share the same voltage, the lower frequency will still consume less power than the higher frequency.
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