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[RESEARCH] Overclock on Qcom useless due to screened SoC's

OP m11kkaa

28th May 2014, 12:40 PM   |  #1  
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Some weeks ago @Quarx told me that he tried to overclock his MotoG. At a first look it works. The system is stable and cpuinfo apps show 1.9GHZ.
BUT: there isn't any performance change. Then I checked it on my device(Xiaomi Mi2) - exactly the same result.
I watched a video about Nexus4 overclock: https://www.youtube.com/watch?v=96hsPe-JH2M
As you can see there isn't any change, too(the minor differences are just random).

Then Quarx found a very interesting commit in MotoG's kernel log:
https://github.com/Quarx2k/kernel-mo...43bdaf71dcb67a
The message tells us, that QCOM devices normally are "screened" which basically means, that if your max freq is 1.2GHZ, it doesn't matter what you change in the kernel source. it will always be 1.2GHZ even if it shows 100GHZ because the SoC is limiting that.

There are some older SoC's with adreno 2xx which seem to be overclockable without any problems.
But all new SoCs seem to be screened which prevents overclocking.

Some more tests of other devices and SoC's would be helpful.
Last edited by m11kkaa; 28th May 2014 at 12:48 PM.
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30th May 2014, 06:49 PM   |  #2  
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I'd recommend you get a buttload of single-thread Linpack benchmarks at different frequencies and do some statistical analysis. Maybe make a Google Form where you can input Device, Frequency, and MFLOPS

Linpack because it's exclusively CPU, doesn't vary much between devices of the same model, and scales nicely with frequency.
30th May 2014, 07:31 PM   |  #3  
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Quote:
Originally Posted by scy1192

I'd recommend you get a buttload of single-thread Linpack benchmarks at different frequencies and do some statistical analysis. Maybe make a Google Form where you can input Device, Frequency, and MFLOPS

Linpack because it's exclusively CPU, doesn't vary much between devices of the same model, and scales nicely with frequency.

I think Linpack isn't reliable enough because it's completed too fast. For me it takes 1-2s to complete and the result variate's very much.
Sth like Antutu(only the CPU score) with performance governor and maybe even on a clean install would be better.
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