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Battery issues and overclocked kernels
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DarthJabba

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2013/12/03 - 11:03
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Hi all

From my tests, I believe that kernel #38 is the most fertile ground for overclocking and also battery optimisation. I have been experimenting with different overclocking permutations with voltages and clock speeds. The aim is to fine tune the kernel #38 for optimum cpu+gpu performance coupled with optimum battery life.

So far, I have been operating on the basis of;

  • max cpu=1800mhz
  • max GPU=798mhz
  • DDR RAM=720mhz

I have found this combination stable in operation, with no overheating issues or any other obvious problem. I get constant Antutu benchmarks of around 20500.

The final goal is to ensure that all this extra performance is not at the expense of battery drain. This involves trying to get the cpu to run at the lowest possible clock speeds when the system is in standby or when it is doing low priority tasks. I have succeeded somewhat in this, but I would need more tests to be able to eke out the last ounce of battery performance.

SO. If you would like to help to test these kernels, please let me know (thanks in advance!). What I will need from testers is that they install the app "Android System Info" (https://play.google.com/store/apps/details?id=com.electricsheep.asi) - some of you may have it already. The "System" tab on that app has "cpu" among other things. Tap on that, and you will see details of the cpu states and how much time the system has spent in each clock speed (see the attached screenshots). That information will be useful in tweaking the cpu states. Thanks.

screenshot_126-1800.pngImage Enlargerscreenshot_252-1800.pngImage Enlarger

 

 

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maikal
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2013/12/03 - 14:49
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I can get on this tonight when I get home Darth, count me in!

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2013/12/03 - 14:59
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Thanks guys, that's interesting.

I'm also looking to complete these overclocking tests by measuring and graphing the impact on battery life.

We have  a special feature for battery life test in ArcTools built a while ago, I am still using it for some tests but it would require some cleanup and documentation that I will do if a few users here want to help running the tests on their device. Just let me know Wink

Cheers.

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2013/12/04 - 00:13
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Okay, here it is: http://www.arctablet.com/users/forum/opinions-on-teclast-p90hdst_OC_kernels_001.zip

It contains 3 overclocked permutations of kernel #38 and 3 overclocked permutations of kernel #12. I am most interested in the kernel38 versions at the moment.

The test is to see which of them is best optimised for battery longevity, both during standby, and in normal use - but especially during standby.

After installing each kernel, do the following:

1. reboot the tablet, and leave it for 5 minutes

2. reboot it again, and leave it alone for about 3 to 4 hours.

3. write down the cpu states as shown in the "Android System Info" above

4. write down the usage statistics as shown by the GSam Battery Monitor

 

Then compare the results of all the test kernels, and note which one drains the battery least, and which drains it the most. This is of course not very scientific, but it should do for the standby test.

Thanks.

 

PS: it would be useful to be able to do proper scientific tests using admin's tool above - but the rough and ready test above is currently sufficient for my purposes.

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2013/12/04 - 03:47
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okay i started with the first #38 tonight. will keep you informed as i go.

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2013/12/04 - 15:17
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Okay, sorry if this is a mess. This is a snap shot from the first #38. It covers the initial 3 hrs with the screen ON, then I turned off the screen for the night while I slept until I got to my office this am. If it does not come out right I will re do this post and try from home, since I am on office system it may not work right. If I need to do something different let me know. Also if you require something else during testing Darth let me know.  If this is acceptable I will go on to the next kernel tonight.

Screenshot_2013-12-04-08-36-01.pngImage EnlargerScreenshot_2013-12-04-00-51-26.pngImage EnlargerScreenshot_2013-12-04-00-53-16.pngImage EnlargerScreenshot_2013-12-04-08-28-16.pngImage EnlargerScreenshot_2013-12-04-08-28-58.pngImage EnlargerScreenshot_2013-12-03-21-16-09.pngImage Enlarger

 

 

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2013/12/04 - 17:29
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Thanks. But it seems that there are two different kernels that you have posted information about? One is 126mhz-1800mhz, and one is 312mhz-1608mhz.

I am also not clear which screenshots relate to 3 hours with the screen ON, and which relate to overnight standby.

Thanks.

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2013/12/04 - 18:49
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DarthJabba said
Thanks. But it seems that there are two different kernels that you have posted information about? One is 126mhz-1800mhz, and one is 312mhz-1608mhz.

I am also not clear which screenshots relate to 3 hours with the screen ON, and which relate to overnight standby.

Thanks.

 

 

Sorry, i thought I had noted that. Okay so the one with the date/time of Tues 9:16pm was what was mounted prior to flashing the first #38 on the kernel zip list. That one was the #12 darthjabba 2.06 rom, I believe.

The others are your version of the first listed #38 on your zip on this thread. There are 2 dated wed and timed at about midnight those are after the 3 hr run while screen was on. The final 3 are this morning, after putting the tablet to sleep shortly after 12:53 am(screen was asleep all night). The battery graph in blue depicts the time from the second reboot to tablet placed asleep, screen was asleep during the night until arrival to my office this morning.

 

If the 3 hr run while awake is not long enough let me know, I can run it again, or proceed to the 2nd. # 38 kernel.

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2013/12/04 - 23:39
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Ok, thanks. Please feel free to go to the second one (1800t4). Thanks.

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2013/12/06 - 03:24
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Kernel screenshots

So I hope this works. Its taken all day to figure out a way around the attachment problem I am having.icon_spacer-vflN3BYt2.gifThese were taken last night with screen and wifi on for the three hours. Then I put the tablet to sleep, wifi still on, and took the last screenshots this morning at my office. Hope they are clear.
icon_spacer-vflN3BYt2.gifYou may have to right click and open in a new tab or windo to open. At least I managed to do so in my daughters macbook just to check, since she has no access to my dropbox. In any case it did open for her in a separate tab. If all is okay I am moving on to the next kernel DarthJabba.
 
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2013/12/06 - 04:29
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I wanted to add. If these are indeed overclocked #38 kernels, then they are behaving, so far, much more stable regardless of what their battery usage is doing! This last one is heating up more than the last one though, along the back quadrant by the buttons when charging. The heat lowers considerably after disconnecting. Like  i said its working smooth, apps are behaving great, and opening and closing with no delay more so than the original #38 oc 2.06 zip. Will continue to report.

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2013/12/06 - 08:55
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Thanks. I was able to view them in a new tab. Yes, these are the overclocked kernels (clue: look at the cpu states in the "System" tab of Android System Info, which shows how long the cpu has spent in each clock speed).

The second one ("cpu1800t4") would generate more heat (and also better performance) because it has more of the higher clock speeds.

Please move on to the third kernel38 now (ignore the kernel12 packages).In my tests so far, the second one has been the better compromise between performance and battery life (i.e., best performance, coupled with a decent batter life).

Thanks.

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2013/12/06 - 10:16
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Guys, sorry about the pictures problems on the forum Confused

I'm not 100% sure, but it looks like pictures hosted on Dropbox can be downloaded but don't like to be linked (ie they don't display properly as images). A better way to attach images would be to host them on the forum, as DarthJabba does, it's quite easy I posted a short guide here.

Cheers.

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2013/12/06 - 13:55
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admin said
Guys, sorry about the pictures problems on the forum Confused

I'm not 100% sure, but it looks like pictures hosted on Dropbox can be downloaded but don't like to be linked (ie they don't display properly as images). A better way to attach images would be to host them on the forum, as DarthJabba does, it's quite easy I posted a short guide here.

Cheers.

 

For some reason the attachment thing just did not work for me. Don't know if its that my G.I. pc is loaded with security crapware or not that prevented the downloading. But then when I could not do it from home I started thinking it was the system here or trying from the office altered my flashdrive data so that it would only download with dropbox. Don't know. TOday I can see that "edit" button is on my previous post #6, which did not appear yesterday. We'll see when I post the next batch.

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2013/12/07 - 03:57
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 Okay, I don't know what I am doing wrong here. I am finding it harder to post these. I really don't know. The attachment feature is just not responding. I followed the instruction, it could be something on my end I imagine. But the link should work to open them.

 

I found that if you change from the little pics to list form and open them in a new tab they should open individually once you are in drop box. I am sorry, doing the best I can. The kernel did as well as the previous one.

I did notice less heat coming from the back. Opening and closing apps worked well also, very smooth. It seemed the battery discharged faster though. Let me know if they don't open will you, I still have them saved to the dropbox.

These were done this morning. Please note the times on the upper announcement bar. The first ones were taken after the initial 3 hours, screen awake, no wifi since I have no access from the office. The rest were taken with the screen asleep for the rest of the day.

 

https://www.dropbox.com/sh/g0dpwlam3zcd0ca/VNYLu8c_vD

 

 

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