I am looking to download a kernel, and there is one with HAVS. What does that mean and does it affect my battery life?
rosser725 said:
I am looking to download a kernel, and there is one with HAVS. What does that mean and does it affect my battery life?
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It means the kernel will adjust the voltage used based on what is required for that CPU speed. Its called Hybrid Adjustable Voltage Scaling I believe. By using less voltage, less battery is used.
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Related
Are they the same thing?
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no....underclock means to lower the clockspeed (from 1ghz to 900 mhz fkr example) and undervolt means to lower the voltage being delivered to the cpu at a given clockspeed.....you as the user can freely undervolt using setcpu but the kernel chef is the only one who can undervolt a kernel
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Thanks!
Ok, 4 questions:
1)Does undervolting slightly affect the performance of the phone? If so, in what way?
2) Which kernel is better on the battery? Kingclick, our hydra kernel?
3) does it make sense to overclock slightly on an undervolted kernel.
4) which roms are most compatible with each kernel if there is a compatibility issue?
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iflip said:
Thanks!
Ok, 4 questions:
1)Does undervolting slightly affect the performance of the phone? If so, in what way?
2) Which kernel is better on the battery? Kingclick, our hydra kernel?
3) does it make sense to overclock slightly on an undervolted kernel.
4) which roms are most compatible with each kernel if there is a compatibility issue?
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1. undervolting improves battery
2. hydra is better on principle
3. overclocking is never necessary....overclocking isnt needed at 1ghz, but if you insist in overclock, 1.113 ghz is good....or 1.15 but i wouldnylt reccommend 1.2
4. all sense roms work with custom kernels
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jdkoreclipse said:
1. undervolting improves battery
2. hydra is better on principle
3. overclocking is never necessary....overclocking isnt needed at 1ghz, but if you insist in overclock, 1.113 ghz is good....or 1.15 but i wouldnylt reccommend 1.2
4. all sense roms work with custom kernels
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I'm pretty sold on skyraider. But It s packaged with kingx. Have you tried hydra with skyraider? Does it perform better than king x and would you recommend it?
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iflip said:
I'm pretty sold on skyraider. But It s packaged with kingx. Have you tried hydra with skyraider? Does it perform better than king x and would you recommend it?
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Kingxklick is a theif
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Which kernel is undervolted more? Hydra or kingxklick?
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iflip said:
Which kernel is undervolted more? Hydra or kingxklick?
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I'm not sure....but kingklick kernels are overvolted too
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So if I have a stock rooted 2.2 Incredible and just want to save some battery, can I just drop a kernel in place and it will "just work" ? I have SetCPU lowering the clock when screen is off, would this be better?
thanks!
msjulie said:
So if I have a stock rooted 2.2 Incredible and just want to save some battery, can I just drop a kernel in place and it will "just work" ? I have SetCPU lowering the clock when screen is off, would this be better?
thanks!
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If I was you, I would flash your kernel of choice (mine is hydra ssuv v0.5) and definitely lower the screen off profile....and use a good Rom too...speed isn't always in the kernel you use, its in the Rom too...that's why I don't overlook....
And also, unpack and quadrant are just bragging rites, nothing more nothing less
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jdkoreclipse said:
Kingxklick is a theif
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WOW...just wow
bro, could you please not speak derogatorily of others?
Hello, I'm a noob with a quick question about undervolting. I am running SyndicateROM Frozen 1.0 EB13/EXT4 with the Twilight Zone kernel. I have the SetCPU.apk installed and I have some profiles and sliders set. I would like to undervolt to save some battery. Is this thing already undervolted? If so, is it only undervolted at 1.2GHz? Is there even a way for me to change anything relating to undervolting?
Thanks for any help.
td25er said:
Hello, I'm a noob with a quick question about undervolting. I am running SyndicateROM Frozen 1.0 EB13/EXT4 with the Twighlight Zone kernel. I have the SetCPU.apk installed and I have some profiles and sliders set. I would like to undervolt to save some battery. Is this thing already undervolted? If so, is it only undervolted at 1.2GHz? Is there even a way for me to change anything relating to undervolting?
Thanks for any help.
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Undervolting is something that needs to be coded into the kernel by the dev. The best way to save battery would b to use setcpu to a max of 1ghz. An overclocked/undervolted kernel will run at 1.2 ghz while using the same amount of juice that a norma kernel would use at 1ghz
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Sh0wNuF said:
Undervolting is something that needs to be coded into the kernel by the dev. The best way to save battery would b to use setcpu to a max of 1ghz. An overclocked/undervolted kernel will run at 1.2 ghz while using the same amount of juice that a norma kernel would use at 1ghz
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and if they've done it right, which they have, 1Ghz will be using less battery than stock at 1Ghz. in theory the lower you set it the less battery you should use, but you dont directly change the undervolting settings, just the clock speed.
Much obliged.
I think that kernel only has undervolting enabled on 1ghz. So if you're on 1.2ghz it will only be overclocked without the undervolt...I think
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cozmonot said:
I think that kernel only has undervolting enabled on 1ghz. So if you're on 1.2ghz it will only be overclocked without the undervolt...I think
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I believe its undervolted at 1.2. Reason I say this is because I flashed the genecide kernal and set it at 1.2 ghz which I know is not undervolted on genecide only 1ghz is I believe and I got crappy battery. On the twilight kernal I'm set at 1.2 and getting great battery. That's just my observation so far.
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hugo87 said:
I believe its undervolted at 1.2. Reason I say this is because I flashed the genecide kernal and set it at 1.2 ghz which I know is not undervolted on genecide only 1ghz is I believe and I got crappy battery. On the twilight kernal I'm set at 1.2 and getting great battery. That's just my observation so far.
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I'm sorry, but you can't say that a great battery is caused simply by an undervolt at 1.2Ghz. The Twilight kernel, from my knowledge, is not undervolted at 1.2Ghz, only at 1.0Ghz. The great battery life you're getting out of the Twilight kernel is because of how it was coded and optimized. My 2 cents.
Twilight kernel is not undervolted on 1.2 ghz. Only 1.0. Read the thread
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I'm using XDA app and been searching forums on what kernals do, I'm running cm7 latest nighty with tiamat latest version. Not sure what all the features are , I know it does overclocking and under and voltage adjustments, just wondering if it was worth going to tiamat from cm7 kernal and if it gives better performance and better battery? Thanks
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fierceeagle2003 said:
I'm using XDA app and been searching forums on what kernals do, I'm running cm7 latest nighty with tiamat latest version. Not sure what all the features are , I know it does overclocking and under and voltage adjustments, just wondering if it was worth going to tiamat from cm7 kernal and if it gives better performance and better battery? Thanks
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Different kernels work better for different phones... give them a try (give it a few days) and see which works best for you! Like you said, undervolting, under/overclock, BFS, HAVS, CFS, all features to increase battery life and/or performance!
Thanks for reply
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The kernel is the part of the operating system that is in direct control of the hardware, its the lowest level of the OS. It controls the frequency the CPU runs at, how much power to pull from the battery, how to schedule I/O, how many frames per second animations run at, and things of that nature.
In my opinion, rooting is almost useless without flashing a custom kernel. Thats really the only way to increase the performance of your phone.
cobirch2 said:
The kernel is the part of the operating system that is in direct control of the hardware, its the lowest level of the OS. It controls the frequency the CPU runs at, how much power to pull from the battery, how to schedule I/O, how many frames per second animations run at, and things of that nature.
In my opinion, rooting is almost useless without flashing a custom kernel. Thats really the only way to increase the performance of your phone.
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Thanks..
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Which one do you think provides the best battery life and performance?
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jbadboy2007 said:
Which one do you think provides the best battery life and performance?
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The one that shuts your phone completely off...LOL.
All kidding aside, the only thing I have seen actually provide better battery life with these is to lower the max speed. Even the author of SetCPU says you can have performance or better battery life, not both. I believe SetCPU provides more options for profiles whereas Voltage control lets you play with voltages which of course is very dangerous for stability. There are so many options in both that it will be hard to get a definitive answer and since every phone is different, Your Mileage May Vary.
kennyglass123 said:
The one that shuts your phone completely off...LOL.
All kidding aside, the only thing I have seen actually provide better battery life with these is to lower the max speed. Even the author of SetCPU says you can have performance or better battery life, not both. I believe SetCPU provides more options for profiles whereas Voltage control lets you play with voltages which of course is very dangerous for stability. There are so many options in both that it will be hard to get a definitive answer and since every phone is different, Your Mileage May Vary.
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With voltage control (and now setcpu), you can undervolt and overclock which could theoretically give you performance and speed. I'm a setcpu supporter, btw.
Tegrak. 'nuff said
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kennyglass123 said:
The one that shuts your phone completely off...LOL.
All kidding aside, the only thing I have seen actually provide better battery life with these is to lower the max speed. Even the author of SetCPU says you can have performance or better battery life, not both. I believe SetCPU provides more options for profiles whereas Voltage control lets you play with voltages which of course is very dangerous for stability. There are so many options in both that it will be hard to get a definitive answer and since every phone is different, Your Mileage May Vary.
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Very well put,,
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I like SetCPU myself , but mainly because my phone doesn't do well with undervolting
Did setcpu in the past dropped for tegrak.....way better!
rootxda said:
Did setcpu in the past dropped for tegrak.....way better!
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I'm undervolting with tegrak right now because I can't with setcpu. Definitely worth the money
It also depends what you are running. Voltage Control won't work with Gingerbread leaks and Tegrak with SetCPU is working nicely to prevent the random reboots in the leaks.
xopher.hunter said:
Tegrak. 'nuff said
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Same here...
I used Voltage Control on my phone and SetCPU on my tab.
I support setcpu, i use it well, as u concerned thd battery life, so lower the max frequency, hope to help u!
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What are your favorite settings and governor???? Which one you recommend for best battery life?? Which UV and OC works best with your rom???
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chuko303 said:
What are your favorite settings and governor???? Which one you recommend for best battery life?? Which UV and OC works best with your rom???
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What kernel are you using? I usually uv by -25mV each step and start from there. In the Original Android Development section, Ktoonsez has a kernel and on the OP he lists what his voltage settings are....or at least a decent starting point.
I am currently using Agat v0.3.2 kernel, no OC, ktoonservative govenor with the deadline schedule. With moderate to heavy usage I can get just about a day out of a charge (usually with about 3-5 hours of on screen time).