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SoC - CPU Binning (MSM8974 Snapdragon 800 )

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By dillalade, Senior Member on 18th June 2014, 12:26 PM
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Firstly I am not a developer - merely an avid android user.

This thread stems from work done by devs on my previous device - where the developers went to the extent of providing various voltage tables for the most COMMON SoC's that users had on there devices.

Hence this is merely an attempt to define what (IF ANY) variations of CPU we may have on our beloved Z1C's.

Maybe this can in turn help Z1C users better zone in on any Undervolting attempts as well as provide our ROM & Kernel developers with further information.

This page should help with the comprehension behind CPU Binning https://plus.google.com/+PaulReioux/posts/YXxQnnZxC7j

How to post your CPU Version:

(You may want to perform this after a reboot - as the dmesg can grow very big, and the part we want may possibly have been overwritten.)

1 Install then open Terminal Emulator (or whichever Terminal you use on your phone.)
2 type 'su' enter
3 type 'dmesg | grep clock-krait-8974'
4 copy and paste your findings here.

From the screenshot attached you can see I have:

PVS config version: 1
speed bin: 2
PVS bin : 3
PVS version: 0


Apparently there are 8 binnings for MSM8974 Snapdragon 800 (0,1,2,3,4,5,6,7) - if my device findings are correct then I fall half way.

It's said that the higher the PVS bin value the better - in terms of it gives of less heat and requires less voltage:

0 requires the MOST/HIGHEST voltage range to boot, and 7 required the LEAST/LOWEST voltage range to boot.
Because lower binning SOCs use higher voltage values, they tend to run hotter than higher binning versions.


This thread may amount to nothing - but it could in turn help you all with potential undervolt guidance as well as perhaps helping our kernel devs in supplying adjusted default voltage tables if we do find that there are many variations in the Z1C's being used among us - which I'm sure there are.
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Last edited by dillalade; 18th June 2014 at 01:59 PM.
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18th June 2014, 12:28 PM |#2  
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18th June 2014, 01:24 PM |#3  
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My results.
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18th June 2014, 02:08 PM |#4  
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And my output:
PVS config version: 1
Speed bin: 2
PVS bin : 3
PVS version: 0
18th June 2014, 06:31 PM |#5  
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On a DoomLord kernel v19
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18th June 2014, 07:50 PM |#6  
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PVS config version: 1
speed bin: 2
PVS bin : 3
PVS version: 0
19th June 2014, 08:42 AM |#7  
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Code:
⏚ [rekoil:~] % adb shell
shell@amami:/ $ su
root@amami:/ # dmesg | grep clock-krait-8974
<6>[0.918252] clock-krait-8974 f9016000.qcom,clock-krait: PVS config version: 1
<6>[0.918384] clock-krait-8974 f9016000.qcom,clock-krait: Speed bin: 2
<6>[0.918570] clock-krait-8974 f9016000.qcom,clock-krait: PVS bin: 2
<6>[0.918679] clock-krait-8974 f9016000.qcom,clock-krait: PVS version: 0
19th June 2014, 10:09 AM |#8  
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Code:
0.532765] clock-krait-8974 f9016000.qcom,clock-krait: PVS config version: 1
0.532812] clock-krait-8974 f9016000.qcom,clock-krait: Speed bin: 2
0.532839] clock-krait-8974 f9016000.qcom,clock-krait: PVS bin: 3
0.532861] clock-krait-8974 f9016000.qcom,clock-krait: PVS version: 0
Last edited by aigaming; 19th June 2014 at 10:12 AM.
19th June 2014, 12:31 PM |#9  
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Sent from my D5503 using xda app-developers app
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20th June 2014, 01:51 PM |#10  
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dmesg | grep clock-krait-8974 - gives me nothing. What i have doing wrong?
20th June 2014, 02:02 PM |#11  
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Quote:
Originally Posted by dron39

dmesg | grep clock-krait-8974 - gives me nothing. What i have doing wrong?

Reboot once and try again...

Sent from my Xperia Z1 Compact using Tapatalk 2

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