yashsingh1/xdaforums huggingface dataset:
[Nexus 7 General] Deivi_Z:
I run oxydoso underwoldet by 75mw i get 6 ~ 8 hrs of usage. I always had hard time running m-kernel.
[Nexus 7 General] dicxz80:
Anyone here using nexus 7 tilapia can get good standby time?

Mine is suffering from 5% per hour battery drain during standby (bbs reporting more than 90% deep sleep)

My issue is only with standby battery drain. I even tried grouper rom to my tilapia device as i was suspecting 3g baseband component the one is causing battery drain but result remain same

Btw i can get easily more than 5 hrs video playback
[Nexus 7 General] Ironic:
With maximal brightness? :eek:
[Nexus 7 General] dicxz80:
not maximal

about 10 of 15, using mxplayer
[Nexus 7 General] Kotaless:
[MENTION=4285505]bcvictory[/MENTION]

Do you think update results to 4.4 Kitkat?

Thank you.
[Nexus 7 General] xateeq:
OP is left this thread :(
[Nexus 7 General] Kotaless:
Why? :crying:
[Nexus 7 General] xateeq:
got new nexus 7 2013 :P so no love for old love :D
[Nexus 7 General] konradsa:
Is there a new thread with results for the 2013 model?

EDIT: never mind, found it: http://xdaforums.com/showthread.php?t=2458708
[Nexus 7 General] Reiven89:
Would be interesting to see tests results updated with the nexus 7 2012 updated to 4.4.2
[Nexus 7 General] xateeq:
This thread is dead, OP has left the 2012 and moved to 2013.
[Nexus 7 General] H4CK_H0PP3R:
I am noob in terms of kernel..Now on franco r77 nexus 7 2012 3G model, Can anyone tell me there setting for maximum battery life, I do not wants to mess at first instance..
[Nexus 7 General] AqCwW:
yo really good and useful topic.i usually refer to this topic before i really wanna change my kernel to another.

but we should make a test under 4.4！！

thx anyway
[Nexus 7 General] yattamove:
This is old thread.
[Nexus 7 General] ÜBER™:
It didn't I was confused with your statement.

Sent From My N7 via White Tapatalk
[Nexus 7 General] bcvictory:
I did the test because it is probably one of the most demanding tasks on the N7. Might not be a real world test but the battery tests are probably on the low end. Meaning that you would get a lot more.
[Nexus 7 General] krazeecracker:
That's true. Didn't think of it that way lol. Either way I appreciate the thread
[Nexus 7 General] clemsyn:
Can you try my latest Battery Saving kernel? I need somebody to test it since pinoyto is stuck on my 1.8ghz 700 gpu ;)

Here is the link

http://xdaforums.com/showthread.php?t=1903304
[Nexus 7 General] ÜBER™:
Real world usage with Franco.

Sent From My N7 via White Tapatalk
[Nexus 7 General] Metallice:
What? No, hardware accelerated video playing is one of the LEAST demanding tasks for the N7 or really any soc with any kind of media support. The low power companion core was designed for this stuff because reading and video playback take so little CPU power. Also there's PRISM to factor in.

You think 10 hours of battery life is on the low end?
[Nexus 7 General] noneabove:
I suggest running it with cpu clocked at 1ghz at least, like max 1300 min 1000, just for more power consumption
[Nexus 7 General] bcvictory:
I used software decoder. If you have a better test idea post it and I might do it.
[Nexus 7 General] Metallice:
If you forced software decoding then yeah 720p video is demanding on the CPU. You should probably make that clear. Honestly I think it would be helpful to set both the min and max to 1300Mhz and run the test. The more variables like scaling you can eliminate the better.
[Nexus 7 General] bcvictory:
I get what you mean but I think the results would be similar even if scaling was the same.

New Elite Battery Saver just got added to the OP.

Spreadsheet got updated as well

It got 7 hours 20 minutes on the battery test.

Quadrant Score: 4659

FPS:60
[Nexus 7 General] RockNrolling:
Thanks for putting all these stats together! It's a great resource and it helped me decide to try Franco's kernel. You obviously spent a lot of time on this and it is very much appreciated. :)

Sent from my Paranoid Nexus 7
[Nexus 7 General] extremetempz:
you doing the battery saving kernel
[Nexus 7 General] pinoyto:
Pretty good for an overclocked kernel of 1.5ghz (not 1.3 as stated on max frequency on op) and GPU of 533

Awaiting result on his battery saving kernel and see if it beats stock.

BTW, how about using a better benchmark for GPU since quadrant scores are greatly affected by pixel clock.
[Nexus 7 General] bcvictory:
Oops... forgot to change the name. That one was the battery saving kernel I just tested.
[Nexus 7 General] bcvictory:
The stock results is based of CNET's tests which are the same with mine. That means stock kernel with stock ROM. I can't get the stock kernel booting on my device now.
[Nexus 7 General] tebuddy:
I'm curious if anyone can elaborate. How can the undervolted stock kernel not get better battery life than the stock or franco's kernel?
[Nexus 7 General] extremetempz:
i no thats weird lower levels of voltages lower gpu clock gets worse battery life
[Nexus 7 General] bcvictory:
I'm actually very surprised at the results. The stock results is CNET's results with stock ROM and stock kernel so the stock may or may not be lower. Anybody got the stock kernel for me to flash?
[Nexus 7 General] aLPaSLaN07:
Does the FPS values in the op mean "smoothness"? The higher FPS, the smoother? Or we just say that human eye can not see the difference when its 60+ fps?
[Nexus 7 General] Milamber33:
That often means it's not entirely stable. Lower the voltages too far and it starts dropping instructions every now and then. Rerunning them means it has to work harder for longer to do the same job, thus resulting in poorer battery life. Maybe try again with the voltages bumped up slightly?
[Nexus 7 General] pinoyto:
Its because he did not test it like he should have "till it is dead" as he said in his first post but by multiplication. He posted he tests battery life by "Watching HD 720p Video on a Loop (MX Player Software Decoding) until dead" but this was not done with the kernel.

Here is his post from clemsyn's thread

QUOTE:

"No, totally get what you guys are saying. Totally got too excited and posted early. I apologize. Saying that, the result I got is the same as the one I posted. Next time I will test all the way."

Here is the link of how I found out

http://xdaforums.com/showthread.php?t=1903304&page=3

post #24
[Nexus 7 General] DexterMorganNL:
I really appriciate this topic, however I think score off the stock rom is with H/W decoder as I'm doing a test to but I run Montley's kernel at 1.3 and I went from 62% to 52% in one hour with H/W decoding, but the audio ac3 was done by software decoding.

Now I'm doing the same test but then with software decoding and I can already see that battery is decreasing much faster.

It went in 15 mins from 52% to 45% and now the timer is one 21 mins and the battery went to 43% so I can see with software decoding the battery drains much faster, now I reached 42% and it played 23 mins total.

This is just an indication, but when you multiple it you will get quite close, this brings me to conclusion that software decoding uses much more, so picking right files can be usefull.

But then I think Franco kernels might be interesting when looking for great battery when playing video as you get very good results with software decoding, but I don't know if it would make much difference with hardware decoding.

I used auto brightness.
[Nexus 7 General] irishrally:
He is testing the stock kernel, not the stock ROM and is running CM10-PA. He also states that the kernel battery tests are all using MX player with software decoding.
[Nexus 7 General] Metallice:
You can't use the stock kernel with CM10 or PA so that's not true. Also, he said the 10 hour value came from cnet which was obviously done using HW decoding.
[Nexus 7 General] bcvictory:
Yeah. Feel free to do your own tests if you don't believe me.
[Nexus 7 General] bcvictory:
That was only for that kernel and my results were almost exactly the same give or take a few minutes.
[Nexus 7 General] jarayn:
In fairness to that poster the stock kernel result is one I have a problem with too.

For me everything needs to be compared to stock. Like will it last longer, will it be faster etc.

As it stands using CNET values with different decoding setup doesnt give me that baseline.

Its a great post though for comparing all the custom kernels, and I certainly appreciate the time spent.

I also find it quite odd that the undervolted kernel doesnt achieve a better result. Kinda defeats the purpose.
[Nexus 7 General] Nbsss:
Which version of Franco's was used, I think he's updated it to r-12, might have different results...
[Nexus 7 General] jarjar124:
should be the same regardless.
[Nexus 7 General] Nbsss:
I'm getting about 300 more than his score with the exact same setup.

Ie v6 supercharged, Jay's tweaks, force gpu rendering, and pa rom...
[Nexus 7 General] jarjar124:
it varies...
[Nexus 7 General] Nbsss:
Ok, just curious
[Nexus 7 General] Logic_:
Is it just me or does 10 hours of screen on time (with stressed cpu) seem grossly overstated?? Even on stock.
[Nexus 7 General] DexterMorganNL:
I don't think so, I think you can have 10 hours screen time on, if I look at my fast testing yesterday 1 hour hardware decoding on montley kernel was 10% battery life ( Toms

But I didn't put the brightness to zero it was on auto and I didnt put wifi on. I think 10 hours screen time can be done, but depends on your usage, mine is mostly sleeping but does have wifi on then while i'm not even home.

So if I would really want I could reduce battery usage by putting wifi off when i'm away from home from work.

I right now have installed franco kernel.

Also take a look at the battery benchmarks from tomshardware

He got 9 hours and 40 mins battery time when video and the volume was on 50%, I actually connected headphones when I was doing my test as that's how Asus tested the battery.

http://www.asus.com/Tablet/Nexus/Nexus_7/

They state that it got with that setup 9.5 hours battery life while playing 720p video at 100 nits brightness and they had wifi on and gmail logged in.
[Nexus 7 General] aaronpoweruser:
Based on this gpu oc seems to have the greatest effect on battery life as that's the only difference in faux es and ultimate at 1.3 it would be helpful if you included versions tested. I'm not doubting your methodology but the difference are to huge fundamentally the kernels aren't that different. The higher scores on some kernels is due to having a higher panel clock, allowing fps over 60 cf bench or annatu would be a better benchmark as it test cpu and gpu separately
[Nexus 7 General] gallahad2000:
What's the base kernel of the Paranoid Rom? I ended up installing that after seeing these results to get the improved battery. I get a quadrant of 3500 which is in line for what you've quoted for "stock". Is this the stock kernel or is the CM kernel modified?

Also, is anyone building a kernel to maximize battery life while maintaining stock performance? I would much rather have that as far as I can tell nothing on the android market really tests the N7 on stock kernel (unless you count increased fps on a device with a 60Hz screen as an "improvement").
[Nexus 7 General] DexterMorganNL:
Here some real world usage with franco kernel.

I had almost two days battery life.

and 4 hours and 30 mins screentime and in that time I did play some Death Trigger, surf the internet and reading manga.
[Nexus 7 General] b00mb00mchuck:
Hahaaa.. that's cool seeing everything in another language... I had to put my glasses on.. I thought it was my eyes
[Nexus 7 General] DexterMorganNL:
Oh yeah we are not all English people, so we use different languages on or devices, I just use my mother language and that is Dutch.
[Nexus 7 General] AlleN7:
Asus got some amazing stats. 9.5 with video? I can barely get 8 hours by running on low brightness and reading PDFs with some internet surfing.

6 hours is my normal case. That includes light gaming and sometimes videos.
[Nexus 7 General] Metallice:
Its easy to get 10 hours of video if it is hardware accelerated and with Prism enabled.

The stat for the stock kernel is using hardware accelerated playback while those for the custom kernels do not.

Except it looks like Franco test might be mistakenly using HWA playback. But then again all of these results look strange.
[Nexus 7 General] bcvictory:
Updated Franco Kernel with the r16 result. Battery has gone from 9 to 7 hours. I have no idea why it's that much of a difference.

The Bricked Kernel tests are almost done. Will update soon.
[Nexus 7 General] AlleN7:
I am going to see if I can play 10 hours of video. I doubt it.
[Nexus 7 General] bcvictory:
Interested to see how that works...
[Nexus 7 General] Metallice:
He raised the GPU to 484mhz. This also raises the vde, video decoding engine, and the mpe, media playback engine, to 484mhz which will obviously result on increased consumption.
[Nexus 7 General] ÜBER™:
That badly!? That's ridiculous.

Sent From My N7 via White Tapatalk
[Nexus 7 General] Metallice:
*shrug* who knows. For all we know this guy could just be making up numbers as he goes for fun :) Just to mess with everyone.

Its not implausible though.
[Nexus 7 General] ÜBER™:
Lol I guess. I'll see I typically get around 6.5 at least... so if i get anything under that I'll be a little upset.

Sent From My N7 via White Tapatalk
[Nexus 7 General] bcvictory:
Want me to test it again then?
[Nexus 7 General] AlleN7:
Okay My numbers are nowhere close to what you guys are getting and Asus. I'm really disappointed with my N7.

So here are my stats:

So at 0% my hours of screen time would be 8Hrs.

Assuming at 25% the minutes were 15, at 0% it would be 20 minutes.

So this totals to 8 hours and 20 minutes.

I did this test using the low brightness toggle and playing sounds through headphones at 50% volume. Wi-fi was on, but autosync and GPS were off.

The videos were 720p episodes looped over and over using MX Player and h/w decoder.

I am far away from the claimed 9.5 hours of 720p playback.

I wish this and the small pimple on the back of my N7 was enough to request a replacement.
[Nexus 7 General] ncvikingx97:
Just installed elite kernel, and am barely breaking 5000 at 1.8 ghz on quadrant. What are you guys getting ? How do I activate the gpu overclock

---------- Post added at 12:34 AM ---------- Previous post was at 12:32 AM ----------

Also what is your average battery log on elite kernel? Thanks
[Nexus 7 General] simms22:
at 1.8ghz high/1.8ghz low, around 8000 in quadrant, not that it matters. gpu overclock is there already, you dont need to enable it. and at 1.8ghz, you shouldnt be thinking about the battery, itll drain faster than at lower cpu speeds.
[Nexus 7 General] Linexus:
That could help me alot, thanks.

I think I'll go on Motley Kernel.
[Nexus 7 General] Metallice:
Nobody said you had to do that. It's just surprising how much a gpu overclock had on video playback battery life.
[Nexus 7 General] DexterMorganNL:
I'm using clemsyn's battery saver kernel, getting some nice real world battery life, right now almost 7 hours screentime with moderate usage, but I did play some death trigger.
[Nexus 7 General] ncvikingx97:
Any reason you can think of why my score is so low? Could it be the rom? Thanks
[Nexus 7 General] haloeight:
Thanks for taking an experimental approach and sharing the results.
[Nexus 7 General] simms22:
test at 1800/1800, also turn off fsync.
[Nexus 7 General] ncvikingx97:
How do I then off fsync? Thanks
[Nexus 7 General] simms22:
in the terminal emulator..

0 turns it off, 1 turns it on.

also run this script(ext4 mount script) in the terminal..
[Nexus 7 General] StrangerWeather:
Now I know the stock kernel is best for battery life, I would like to flash it back. I am currently using the Clemsyn battery saving kernel. How do I go about flashing the stock kernel? I downloaded a zip earlier on that claimed to be the stock kernel but it did not agree with my device and I had to go into recovery and restore my custom ROM. I'm obviously not looking in the right place. Thanks for your help!:)
[Nexus 7 General] Milamber33:
Which custom ROM are you running? If it's CM based, the stock kernel won't work with it.

And to restore the kernel that comes with your ROM, just reflash your ROM without wiping anything.
[Nexus 7 General] Metallice:
Do we know that? As far as I know, the OP has not tested the stock kernel. I believe the 10 hour statistic was taken from CNET. Different test, different results. Sorry if I'm mistaken.
[Nexus 7 General] I Am Marino:
What does fsync do? I've never known.

-Brought to you by Marino's Galaxy Nexus-
[Nexus 7 General] ÜBER™:
My guess is it stops accounting for data when off. We had something similar to fsync on the epic called journaling where it would keep track of data in case of sudden crashes and if you had it off you could potentially loose corrupted data.
[Nexus 7 General] Metallice:
Journaling is different.

As I understand it Fsync calls for all the data in buffer to be written to the disk. It synchronizes the data table with what is actually on the disk. Turning it off let's the system continue to indefinitely think writes have finished when they are really just sitting in buffer waiting to be written.
[Nexus 7 General] zottelmonster:
Franco kernel now has undervoltage for the GPU. Anyone yet measured how this effects battery life time? Especial for browsing?
[Nexus 7 General] kickmobile:
faux kernel with xenonhd rom..

i usednthe ff tweaks.

smartdimmer

pimp my rom

and many more

sleep mode with 30 minutes wifi and still at 100%
[Nexus 7 General] h.debnath:
Can you do a test for trinity a161
[Nexus 7 General] bcvictory:
I'm considering testing all the kernels again for 4.1.2. Good idea? Would people be interested in it?

4.2 is just around the corner though (October 29th?) so I'm wondering if it's worth it for me to do it now or wait to do tests for 4.1.2.
[Nexus 7 General] RockNrolling:
I would just wait if I were you. It's only a few days until we find out if 4.2 is going to be released.

Sent from my magnetized banana
[Nexus 7 General] kzakhar:
Also, 4.1.2 custom kernels are still not stable and each has its own issues: sod, heat, bad sound, etc.
[Nexus 7 General] bcvictory:
I was bored yesterday so I started the 4.1.2 tests. We prob won t get AOSP source directly on the 29th so I might as well. Some results so far look weird.
[Nexus 7 General] bervin:
is this really true? does everyone have better battery on stock than a battery focused kernel like elite battery saving kernel?
[Nexus 7 General] bcvictory:
I couldn't get stock kernel booting on my rom and the stock battery results are using hardware acceleration but the other kernels are using software acceleration so it's harder on the battery.
[Nexus 7 General] bcvictory:
Added 4.1.2 results to OP. If anyone wants me to redo a test they think is a bit weird just let me know.
[Nexus 7 General] comhack:
Wrong thread, sorry
[Nexus 7 General] davidstech11:
I noticed you have Force GPU rendering on. I seen some for it and some against it. Why do you keep it on? And have you had issues with certain apps because you keep it on ?
[Nexus 7 General] bcvictory:
I heard it helped benchmarks. Might be a myth. Haven't had any problems with it.
[Nexus 7 General] lifeflayer:
I am surprised how competent the stock kernel is. I would have much preferred to see all the benchmarks done at 1.3GHz using the default govern. If you are going to test everyday performance, might as well do it that way. I am also surprised at how bad Trinity performed...

Thanks a lot of the tests though. It helped me a lot in picking the kernel to stick with.
[Nexus 7 General] Heisenberg420:
Very useful information thanks so much.

Which of all current kernels has the most tweaks (most governors / io schedulers)? And is there any kernel/app that allows you to tune CPU governors (like adjust sampling rate ect)?

I'm currently in the process of trying them all for my self but I like to run each one for a few days.

Sent from my Nexus 7
[Nexus 7 General] Xulthir:
Thanks for doing all that testing. It was a good read.
[Nexus 7 General] bcvictory:
Motley or Trinity for tweaks. Maybe Franco as well? Not entirely sure.

As soon as 4.2 kernels come out I will start testing again.
[Nexus 7 General] vimmer77:
This is some good information.

Especially learning that the stock kernel isn't all that bad...

That being said... francokernel is still my love. :victory:
[Nexus 7 General] bcvictory:
I'm back! Started testing stock kernel yesterday for 4.2. What do you guys want tested?
[Nexus 7 General] bcvictory:
Added Stock Kernel results for 4.2. In the middle of testing Faux's kernels.
[Nexus 7 General] lazybeard:
Tnx
[Nexus 7 General] bcvictory:
Added all new kernels.
[Nexus 7 General] astarman:
does using hardware decoding use less battery??
[Nexus 7 General] Milamber33:
Can you please indicate exactly which versions of the kernels you used for these tests? Different versions behave differently, even in the same kernel, and it would be good to be able to go to the thread and read a few posts and see if slightly newer or older kernel versions would give better or worse results than the ones you produced. Also, knowing the GPU OC is important as well. Without this information, your tests are virtually useless for the rest of us.

Yes.
[Nexus 7 General] bcvictory:
Yep. Totally get what you mean. I will update it as soon as I get to my computer.

Sent from my Nexus 7
[Nexus 7 General] xfrancis14:
Franco came out, please update :D
[Nexus 7 General] lrefra:
franco.Kernel is compatible with 4.2
[Nexus 7 General] bcvictory:
Will test overnight. I'll post when I wake up.
[Nexus 7 General] bcvictory:
Franco. Kernel Added to OP. Added other version info as well
[Nexus 7 General] lrefra:
Can add Linaro kernel (from motley) in the test?

Enviado desde mi Nexus 7 usando Tapatalk 2
[Nexus 7 General] kazemitsui:
Thanks for posting in my topic in QnA this helped.

Do you still have the stats for 4.1.2? Since I havent updated to 4.2.x yet?

Thanks!
[Nexus 7 General] Dennelly:
This thread needs to be stickied if it isn't already..It saves a ton of time trying to find a kernel that has a decent *balance*
[Nexus 7 General] invisiblesurfer:
@Dennelly: Couldn't agree more

@OP bcvictory

Man, for someone like me who's new to the Nexus 7 tweeking scene, your work is extremely valuable. I've been browsing through xda and seeing all these kernels and didn't know what to go for. So thank you very much for your efforts and for giving to the community.

By the looks of it, the M-kernel offers the best ratio of battery life vs performance. You used the a13 version in your testing - do you plan to also test the latest a19 version? Do you expect any major deviation from your findings between these two versions?

What I think would be also extremely useful is to also include in your original post any documented issues with the kernels themselves, like frequency of freezes, random reboots etc., and rank according to "stability" - although understandably this may be tricky due to multitude of different user set-ups out there.

In any case, thank you again for your time and effort and God bless.
[Nexus 7 General] bcvictory:
Yep sure. Going to test a19 soon. I don't expect much to change. Going to test Motley Kernel soon.
[Nexus 7 General] bcvictory:
Added Motley Kernel to OP. Testing M-Kernel Plus a19 now.
[Nexus 7 General] superleeds27:
So as it stands M-kernel is the best?

---------- Post added at 09:53 AM ---------- Previous post was at 09:28 AM ----------

Using CM10.1

Flashed M-Kernel a21, wouldnt boot past google logo.

Reflashed Faux kernel, booted, 100's of fc's. Rebooted. Stuck on CM Logo.

Hmm.!
[Nexus 7 General] bcvictory:
Some people have had problems with recent versions. I have had no problems at all.
[Nexus 7 General] superleeds27:
I've reflashed from scratch. Stock image etc.

Flashed 4.2.1 AOKP. And have flashed Motley kernel.

What setting did you use for Motley? Interactive and SIO? the defaults?
[Nexus 7 General] johnnyman25:
i have cleanROM 3 and i tried motley kernel and franco kernel .francos kernel is more smooth while scrooling and in benchmarks.i use nova launcher .can someone tell whats the best rom/kernel combo for battery and performance?thx all!! :)