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[Q] What is a Kernel???

Hi All,
I am quite new to this rooted and rom lark. I have rooted my xoom and installed a rom.
What I want to know is what is a Custom Kernel and what does it do.
Sorry for asking such a daft question.
Cheers,
Fred

This can give you a long answer: http://en.wikipedia.org/wiki/Kernel_(computing)
But making it relevant to your phone, the kernel is what controls all aspects of your phone: cpu configs, I/O governors, etc...
A kernel can customize the way your phone acts in the bigger picture, and this can drastically affect your phones performance and battery drain as well, just to mention a few things. It's best to choose wisely.

Thanks for the information

Looking for Franco Kernel Updater Help Thread.....

I know there has to be one somewhere in the Nexus 5 forums, but wasn't able to locate one in the General forum. Forum search also is currently down on the site. I went ahead and purchased the Franco Kernel Updater Pro (paid) app last night after running Franco's latest kernel for the last few days. I am looking for a good discussion thread on the common settings people are using for CPU & GPU as to get a general idea of the starting point for tweaking my settings. So far I have only really played with the color profile section, but have been reading up on the undervolting and plan to start playing with that this weekend and testing some values. I've also found limited information across several other forums I ran across searching google Franco Kernel Updater application settings etc. Can somebody link me to a good thread on this or a miniguide? I'm basically looking to see what other users are doing with various settings to get a good idea of a place to start. Thanks in advance for any info. I am loving this kernel. Battery life is awesome and it appears very stable.
- Jeremy

jsgates said:
I know there has to be one somewhere in the Nexus 5 forums, but wasn't able to locate one in the General forum. Forum search also is currently down on the site. I went ahead and purchased the Franco Kernel Updater Pro (paid) app last night after running Franco's latest kernel for the last few days. I am looking for a good discussion thread on the common settings people are using for CPU & GPU as to get a general idea of the starting point for tweaking my settings. So far I have only really played with the color profile section, but have been reading up on the undervolting and plan to start playing with that this weekend and testing some values. I've also found limited information across several other forums I ran across searching google Franco Kernel Updater application settings etc. Can somebody link me to a good thread on this or a miniguide? I'm basically looking to see what other users are doing with various settings to get a good idea of a place to start. Thanks in advance for any info. I am loving this kernel. Battery life is awesome and it appears very stable.
- Jeremy
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Click to collapse
there isnt one. you should probably discuss the franco kernel app in the franco kernel thread.

jsgates said:
I know there has to be one somewhere in the Nexus 5 forums, but wasn't able to locate one in the General forum. Forum search also is currently down on the site. I went ahead and purchased the Franco Kernel Updater Pro (paid) app last night after running Franco's latest kernel for the last few days. I am looking for a good discussion thread on the common settings people are using for CPU & GPU as to get a general idea of the starting point for tweaking my settings. So far I have only really played with the color profile section, but have been reading up on the undervolting and plan to start playing with that this weekend and testing some values. I've also found limited information across several other forums I ran across searching google Franco Kernel Updater application settings etc. Can somebody link me to a good thread on this or a miniguide? I'm basically looking to see what other users are doing with various settings to get a good idea of a place to start. Thanks in advance for any info. I am loving this kernel. Battery life is awesome and it appears very stable.
- Jeremy
Click to expand...
Click to collapse
Try this one http://forum.xda-developers.com/showthread.php?t=2532422.

Thanks! That's exactly what I was looking for. I think I ran across a similar post via Google, but it didn't have that device specific questions that thread you link has. Thanks again. That should get me going.
- Jeremy

gee2012 said:
Try this one http://forum.xda-developers.com/showthread.php?t=2532422.
Click to expand...
Click to collapse
ah, there is one :angel:

[Q] Rooting and its basics

I've rooted one phone in my history of rooting - the mytouch 4g. I found it very unstable during that process thus my hold off of rooting until now.
I have a Nexus 5, thus me creating a thread in this forum. I know many will just tell me to google or whatever but I rather get someone's actual response to my post.
That said, what is the different between a ROM and a Kernal. And how can one tell if one is better than another?
I think I want what everyone wants in their phones - stability and extended battery life.
Thanks again.

a rom is the ui, it gives the user variables to adjust and can add some features. a kernel is the central control of your whole phone. it ties the cpu to the rest of your phone, and to your ui. the kernel is like the brain, where the rom is like the outside/skin of the body.
hiw do you know which is better? only by trying them out. some phones will like certain kernels better than others, and you wont know which until you try.

Hi,
Sorry to give you a link to explain what is a rom and what is a kernel, but anyway: http://forum.xda-developers.com/wiki/index.php?title=ROM-VS-Kernel, for me it's a good start.
About battery life it's not the rom that will give you better or worse battery life (unless a "bug"), at least the kernel can play its role but it's mainly your use and settings, the apps you use...
If you have a bad signal reception or a rogue apps with a ton of wakelocks, whatever the rom or the kernel, it will be always the same thing.

Hammer_Of_The_Gods said:
Hi,
Sorry to give you a link to explain what is a rom and what is a kernel, but anyway: http://forum.xda-developers.com/wiki/index.php?title=ROM-VS-Kernel, for me it's a good start.
About battery life it's not the rom that will give you better or worse battery life (unless a "bug"), at least the kernel can play its role but it's mainly your use and settings, the apps you use...
If you have a bad signal reception or a rogue apps with a ton of wakelocks, whatever the rom or the kernel, it will be always the same thing.
Click to expand...
Click to collapse
Hammer-thanks for the link. Very informative for me and I am sure others.
Doc

TXRaunchy said:
I've rooted one phone in my history of rooting - the mytouch 4g. I found it very unstable during that process thus my hold off of rooting until now.
I have a Nexus 5, thus me creating a thread in this forum. I know many will just tell me to google or whatever but I rather get someone's actual response to my post.
That said, what is the different between a ROM and a Kernal. And how can one tell if one is better than another?
I think I want what everyone wants in their phones - stability and extended battery life.
Thanks again.
Click to expand...
Click to collapse
I`am not rooted also atm, the device does everything that i need it to do to be honest. Rooting is handy and usefull if you want to use features or do things that cannot be done with the stock configuration. Read the first 4 threads in the General section well if you want to learn the basics of rooting.

CM11 vs Stock? Anything better?

I've been using the nexus for a while, and although I like the stock rom, is CM11 better? Or any other rom in fact? And I guess when I say better I generally mean performance and possibly battery life? Would a kernal also affect this?
Sorry if I seem naive or anything. Recently switched from an ATT S4 with all its bootloaders and such..

"Best" ROM.
There is no such thing as a best ROM. The question itself is ambiguous. "Best" is obviously a subjective term.
What I want from a ROM may well differ from what you want from a ROM, ergo - what is best for me could be worst for you.
If you are asking what the most popular ROMs are, or which ROMs people are using, you can see which threads stay around on the first few pages (and have the most posts) in the Android Development or Original Android Development forums. You can also see what other people are running by reading the What are you running on your Nexus 5 thread.
If you are asking which is the most stable, being a Nexus device - they're all pretty stable.
If you are asking which is best on Battery, ROMs only affect battery if they have a feature that is badly coded. You will likely be able to read about this in the ROM threads. ROMs do not impact battery life. The only impact to battery life are your apps, your settings, how you use the phone and mostly, environmental issues such as Phone Signal.
For tips about improving battery life, please read [Battery Life Help] Troubleshoot battery issues here!
"Best" Kernel
Also, please note that as above, "best" is still subjective. What we all want from a kernel is different. Again, many people have the misconception that Kernels affect battery life. Let's get this cleared up. Although Kernel devs will build in optimisations and efficiencies that will improve battery life, these are very, VERY tiny...and if 1 kernel has these optimisations, they likely all have.
People will often say "Kernel x is better than kernel y for battery life". This is actually wrong. Kernels respond to user settings. Setting up the governor to favour either battery life or performance is simple enough to do, you just have to do some learning. The reason people think Kernel x is better than y is because developers set their kernels up with their preferred governor settings. This is what we refer to as out-of-the-box settings. The out-of-the-box settings for kernel x may well produce better battery results than the out-of-the-box settings for kernel y, which favour performance. The fact is, you as the user have the ability to tune kernel x or y to perform the same, be that battery or performance - so start learning how to do this yourselves - that way, you can choose the kernel based on the FEATURES you want, and not the fictional performance benefits of one kernel over another.
Hope this helps

The biggest thing is some of the customizations you can get with something like Xposed. A kernel might change things. You can always make a backup.
Sent from my Nexus 5 using XDA Free mobile app

@rootSU you should backup this answer to your clipboard and paste it again & again

Primokorn said:
@rootSU you should backup this answer to your clipboard and paste it again & again
Click to expand...
Click to collapse
I did. I wrote it and added it to both evernote and "clipboard admin"

rootSU said:
I did. I wrote it and added it to both evernote and "clipboard admin"
Click to expand...
Click to collapse
You should add the following to the end:
[THREAD CLOSED]

CM and other ROMs that have SuperSU baked into the system (as opposed to have it installed as an app that shows up in the app drawer) can have difficulties with apps that won't work due to being rooted, and often times the apps you can use to temporarily block/hide root access won't work properly with SuperSU baked in. That's the big reason why I stopped using them. It's simpler to just root stock Android and use xposed modules that can replicate 95% of what CM brings to the table.

rootSU said:
"Best" ROM.
There is no such thing as a best ROM. The question itself is ambiguous. "Best" is obviously a subjective term.
What I want from a ROM may well differ from what you want from a ROM, ergo - what is best for me could be worst for you.
If you are asking what the most popular ROMs are, or which ROMs people are using, you can see which threads stay around on the first few pages (and have the most posts) in the Android Development or Original Android Development forums. You can also see what other people are running by reading the What are you running on your Nexus 5 thread.
If you are asking which is the most stable, being a Nexus device - they're all pretty stable.
If you are asking which is best on Battery, ROMs only affect battery if they have a feature that is badly coded. You will likely be able to read about this in the ROM threads. ROMs do not impact battery life. The only impact to battery life are your apps, your settings, how you use the phone and mostly, environmental issues such as Phone Signal.
For tips about improving battery life, please read [Battery Life Help] Troubleshoot battery issues here!
"Best" Kernel
Also, please note that as above, "best" is still subjective. What we all want from a kernel is different. Again, many people have the misconception that Kernels affect battery life. Let's get this cleared up. Although Kernel devs will build in optimisations and efficiencies that will improve battery life, these are very, VERY tiny...and if 1 kernel has these optimisations, they likely all have.
People will often say "Kernel x is better than kernel y for battery life". This is actually wrong. Kernels respond to user settings. Setting up the governor to favour either battery life or performance is simple enough to do, you just have to do some learning. The reason people think Kernel x is better than y is because developers set their kernels up with their preferred governor settings. This is what we refer to as out-of-the-box settings. The out-of-the-box settings for kernel x may well produce better battery results than the out-of-the-box settings for kernel y, which favour performance. The fact is, you as the user have the ability to tune kernel x or y to perform the same, be that battery or performance - so start learning how to do this yourselves - that way, you can choose the kernel based on the FEATURES you want, and not the fictional performance benefits of one kernel over another.
Hope this helps
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an absolutely wonderful reply!

simms22 said:
an absolutely wonderful reply!
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As long as someone takes.something away from it, I've done my job
Sent from my Nexus 5 using Tapatalk

Advanced Interactive Governor Tweaks

Hi,
Did anyone follow this thread to optimize CPU and battery life?
http://forum.xda-developers.com/nexus-5x/general/guide-advanced-interactive-governor-t3269557
Did you get nice results?
I want to try it on my phone. But I am a little bit lost.
Thanks.

I haven't tried above, but I can share my thoughts:
1. That thread is for Nexus+AOSP, params might not work for Mi4+MIUI.
2. If you wanna try those params on CM, I wonder what's the point. CM is already well optimized. Even with best kernel parameters, you'll never see a difference of night and day.
Is there something specific that you want to focus on for your device?

More battery life. But muy highest problem is mobile radio active bug... Any help?